[27611] in resnet
Re: SOHO WiFi routers and residential networking
daemon@ATHENA.MIT.EDU (Ryan Dorman)
Wed May 2 22:34:54 2012
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Date: Wed, 2 May 2012 22:33:01 -0400
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Ryan Dorman <Ryan.Dorman@blackboard.com>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <D0A43E8CC19B144398DFEC438095CB180E39ACD51B@EXCMS.msu.montana.edu>
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My questions, slightly re-phrased:
1. For those of you who have a similar network, do you utilize either=
Storm Control or flood blocking? Why do you use one rather than the other=
?
a. We used storm control in the dorms back in my day (ha ha ha)... it=
was one of our bandaid procedures for sasser/blaster (hence why I did not =
describe it as the good old days). It has advantage of dealing with multip=
le types of traffic, not just Unicast.
b. This is a good article explaining the differences http://ericleahy.=
com/?p=3D611
2. Do you use some other measure to deal with unicast packet floods?
a. No
3. Considering the physical environment (single wired jacks), what do=
you feel is best practice when it comes to stopping unicast packet floods?
a. There are a couple things I would look at here more from a design =
perspective then a flood protection angle
i. How =
big are your subnets? If they are huge (bigger then /24) you're going to s=
tart running up against broadcast issues.
ii. Have =
you considered Private VLAN's? Might help limit outages to a smaller group=
of people
iii. Do yo=
u limit the number of MAC addresses on a single port?
It surprises me that you are seeing unicast flooding like this.. in campus =
environments, and even in datacenters I have found that that is relatively =
rare. Granted, I don't work in in reshalls anymore and the nature of that =
traffic is different then here in sell-out world :) but I'd be interested t=
o see traces of who is flooding who and from what process etc etc...
Ryan Dorman
Director, Enterprise Technology Strategy
Blackboard Inc.
O: 202.463.4860 x2618
M: 202.370.7889
From: Resnet Forum [mailto:RESNET-L@LISTSERV.ND.EDU] On Behalf Of Crowe, Sh=
eila
Sent: Tuesday, May 01, 2012 2:15 PM
To: RESNET-L@LISTSERV.ND.EDU
Subject: Re: SOHO WiFi routers and residential networking
Thank you to Rand, Bruce and my hero, Adam Brock.
A bit more detailed information to help all the Cisco network guru types he=
lp me. To recap...
We have 2 housing areas: residence halls and family and graduate apartment=
s. Both areas have Cisco 2960 layer 2 switches and Cisco 3750 fiber switch=
es. In the residence halls we have one wired port per pillow and almost ub=
iquitous wireless coverage via Aruba APs and a single controller. ResNet i=
s charged as part of the room and board in the residence halls.
We don't provide wireless coverage in family and graduate housing. Our fam=
ily housing area was wired about 13 years ago and provided only one wired j=
ack per apartment; because of that, virtually every customer in family hous=
ing uses a soho wireless router. Prior to our upgrade in June, we were usi=
ng 3Com fiber switches and Cisco 2960 layer 2 switches, When we upgraded th=
is section of our network (from 3Com fiber switches to Cisco 3750s), we imm=
ediately had a BIG problem with our network dropping in family housing; no =
problems in the res halls. Backwards soho routers were not the problem bec=
ause we use DHCP snooping. Prior to the upgrade, our network ran like a sca=
lded cat in FGH. It was ultimately decided that the problem was caused by =
the larger concentration of SOHO wireless routers in that area producing un=
icast packet floods. Our team has discovered that Cisco switches have a fe=
ature called flood blocking that will block unicast and multicast floods at=
the switchport level. We are deploying this slowly. I am told that it is=
NOT Cisco's Storm Control.
My questions, slightly re-phrased:
1. For those of you who have a similar network, do you utilize either=
Storm Control or flood blocking? Why do you use one rather than the other=
?
2. Do you use some other measure to deal with unicast packet floods?
3. Considering the physical environment (single wired jacks), what do=
you feel is best practice when it comes to stopping unicast packet floods?
If you need more detail from me, please ask. Any information or feedback i=
s appreciated. If you prefer, please feel free to contact me off-list.
Thank you!
Sheila Crowe
MSU ResNet
sheila@montana.edu<mailto:sheila@montana.edu>
From: Resnet Forum [mailto:RESNET-L@LISTSERV.ND.EDU]<mailto:[mailto:RESNET-=
L@LISTSERV.ND.EDU]> On Behalf Of Osborne, Bruce W
Sent: Tuesday, May 01, 2012 5:48 AM
To: RESNET-L@LISTSERV.ND.EDU<mailto:RESNET-L@LISTSERV.ND.EDU>
Subject: Re: SOHO WiFi routers and residential networking
That is only the port part of the configuration. There are some global sett=
ings too.
Also, your switch uplink or the switch port with the DHCP server needs to b=
e trusted for this to function correctly. The three processes used here are=
"ARP inspection", "DHCO snooping", and "IP source guard". The features can=
vary, depending on your model of switch.
Here is one example of Cisco's documentation. This one is for 3550 switches=
. http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/releas=
e/12.2_25_see/configuration/guide/swdhcp82.html
Bruce Osborne
Network Engineer
IT Network Services
(434) 592-4229
LIBERTY UNIVERSITY
Training Champions for Christ since 1971
From: Hall, Rand [mailto:hallr@MERRIMACK.EDU]<mailto:[mailto:hallr@MERRIMAC=
K.EDU]>
Sent: Monday, April 30, 2012 12:39 PM
Subject: Re: SOHO WiFi routers and residential networking
Sheila,
Good luck blocking rogues. :-) Your best bet is to hold to your commitment =
to providing service to the jack. To that you can add some basic best pract=
ice suggestions to people who want to try using a wireless router or bridge=
(enable encryption, negotiate channel selection with neighbors, etc).
Your network folks will want to turn on DHCP Snooping. Sometimes a resident=
will plug a router in "backwards" and offer up DHCP leases to their neighb=
ors--not a pretty sight. If they are new to Cisco they might appreciate a s=
ample interface config for some ideas. Feel free to share:
switchport access vlan xx
switchport mode access
switchport protected
switchport port-security maximum 6
switchport port-security
switchport port-security aging time 1
switchport port-security violation restrict
switchport port-security aging type inactivity
ip arp inspection limit rate 15 burst interval 10
storm-control broadcast level pps 50 10
storm-control multicast level pps 50 10
spanning-tree portfast
spanning-tree bpduguard enable
ip verify source
ip dhcp snooping limit rate 10
Rand
Rand P. Hall
Director, Network Services askIT!
Merrimack College
978-837-3532<tel:978-837-3532>
rand.hall@merrimack.edu<mailto:rand.hall@merrimack.edu>
If I had an hour to save the world, I would spend 59 minutes defining the p=
roblem and one minute finding solutions. - Einstein
On Fri, Apr 27, 2012 at 1:48 PM, Crowe, Sheila <sheila@montana.edu<mailto:s=
heila@montana.edu>> wrote:
In early March, I participated in a thread started by Jeannie Abney about w=
hat other schools' polices are for residents bringing personal wireless rou=
ters onto your network. I added some questions pertaining to single family=
apartments (vs. residence halls) and got some great feedback. I would lik=
e to take it a step further and ask some more questions based on the type o=
f network that we have.
We have a Cisco network, a core at the origin of the commodity internet pip=
e, and a subnet for each of our buildings (really areas). In the residence=
halls we have a large Aruba wireless network installed so that every build=
ing is blanketed for secure wireless internet access. In the residence ha=
lls, ResNet is charged out to every resident regardless of whether they use=
it or not.
We do not provide ubiquitous wireless coverage in family housing because Re=
sNet is an opt-in service. Additionally, our family housing area was wired =
about 13 years ago and only provided one wired jack per apartment. As I'm s=
ure you can imagine, virtually every customer in family housing has a soho =
wireless router. When we upgraded this section of our network (from 3Com s=
witches to Cisco), we immediately had a BIG problem with our network droppi=
ng constantly. It was ultimately decided that it was the SOHO wireless rou=
ters causing the problem; namely, unicast packet floods through our Cisco s=
witch ports. Only recently it was discovered that Cisco switches have a fea=
ture that will block unicast and multicast floods. We are deploying this s=
lowly.
Now for the questions. For those of you who have a similar network, do you =
employ this Cisco feature or do you simply block all "rogue" wireless conne=
ctions? Or do you have another measure in place to deal with the unicast p=
acket floods? Also, do your network engineers consider this a stopgap meas=
ure ("band-aid") to deal with residences where you do not offer WiFi?
Please do share all of the details about this issue (or non-issue) on your =
network as you know them. And thanks a million!
Sheila Crowe
Montana State University ResNet
406.994.4230<tel:406.994.4230>
406.209.7243<tel:406.209.7243>
P.S. I'm hoping to see all of you at the 2012 Student Technology Conference=
at Claremont Colleges!
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<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"font-size=
:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D">My questions, slightly re-phrased:
<o:p></o:p></span></a></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l1 level=
1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"m=
so-list:Ignore">1.<span style=3D"font:7.0pt "Times New Roman"">&n=
bsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">For those of y=
ou who have a similar network, do you utilize either Storm Control or flood=
blocking? Why do you use one rather than the other?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level2 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re">a.<span style=3D"font:7.0pt "Times New Roman""> &n=
bsp;
</span></span></span><![endif]><span style=3D"color:red">We used storm cont=
rol in the dorms back in my day (ha ha ha)… it was one of our bandaid=
procedures for sasser/blaster (hence why I did not describe it as the good=
old days). It has advantage of dealing
with multiple types of traffic, not just Unicast.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level2 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re">b.<span style=3D"font:7.0pt "Times New Roman""> &n=
bsp;
</span></span></span><![endif]><span style=3D"color:red">This is a good art=
icle explaining the differences
</span><a href=3D"http://ericleahy.com/?p=3D611"><span style=3D"color:red">=
http://ericleahy.com/?p=3D611</span></a><span style=3D"color:red"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.75in"><span style=3D"color:#1F=
497D"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l1 level=
1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"m=
so-list:Ignore">2.<span style=3D"font:7.0pt "Times New Roman"">&n=
bsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">Do you use som=
e other measure to deal with unicast packet floods?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level2 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re">a.<span style=3D"font:7.0pt "Times New Roman""> &n=
bsp;
</span></span></span><![endif]><span style=3D"color:red">No<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l1 level=
1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"m=
so-list:Ignore">3.<span style=3D"font:7.0pt "Times New Roman"">&n=
bsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">Considering th=
e physical environment (single wired jacks), what do you feel is best pract=
ice when it comes to stopping unicast packet floods?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l1 level2 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re">a.<span style=3D"font:7.0pt "Times New Roman""> &n=
bsp;
</span></span></span><![endif]><span style=3D"color:red">There are a couple=
things I would look at here more from a design perspective then a flood pr=
otection angle<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.5in;text-indent:-1.5in=
;mso-text-indent-alt:-9.0pt;mso-list:l1 level3 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re"><span style=3D"font:7.0pt "Times New Roman""> &nbs=
p; &=
nbsp; &nbs=
p; &=
nbsp; &nbs=
p;
</span>i.<span style=3D"font:7.0pt "Times New Roman"">  =
; </span></span></span><![endif]><span style=3D"color:red=
">How big are your subnets? If they are huge (bigger then /24) you=
217;re going to start running up against broadcast issues.<o:p></o:p></span=
></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.5in;text-indent:-1.5in=
;mso-text-indent-alt:-9.0pt;mso-list:l1 level3 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re"><span style=3D"font:7.0pt "Times New Roman""> &nbs=
p; &=
nbsp; &nbs=
p; &=
nbsp; &nbs=
p;
</span>ii.<span style=3D"font:7.0pt "Times New Roman""> &nbs=
p; </span></span></span><![endif]><span style=3D"color:re=
d">Have you considered Private VLAN’s? Might help limit outages=
to a smaller group of people<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.5in;text-indent:-1.5in=
;mso-text-indent-alt:-9.0pt;mso-list:l1 level3 lfo2">
<![if !supportLists]><span style=3D"color:red"><span style=3D"mso-list:Igno=
re"><span style=3D"font:7.0pt "Times New Roman""> &nbs=
p; &=
nbsp; &nbs=
p; &=
nbsp; &nbs=
p;
</span>iii.<span style=3D"font:7.0pt "Times New Roman""> &nb=
sp; </span></span></span><![endif]><span style=3D"color:r=
ed">Do you limit the number of MAC addresses on a single port?<o:p></o:p></=
span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.5in"><span style=3D"co=
lor:red"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">It surprises me that you =
are seeing unicast flooding like this.. in campus environments, and even in=
datacenters I have found that that is relatively rare.
Granted, I don’t work in in reshalls anymore and the nature of that =
traffic is different then here in sell-out world
</span><span style=3D"font-size:11.0pt;font-family:Wingdings;color:#1F497D"=
>J</span><span style=3D"font-size:11.0pt;font-family:"Calibri",&q=
uot;sans-serif";color:#1F497D"> but I’d be interested to see tra=
ces of who is flooding who and from what process etc etc…<o:p></o:p><=
/span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Ryan Dorman<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Director, Enterprise Tech=
nology Strategy<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Blackboard Inc.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">O: 202.463.4860 x2618<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">M: 202.370.7889<o:p></o:p=
></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"=
;Tahoma","sans-serif"">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:"Tahoma","sans-serif""> Resnet F=
orum [mailto:RESNET-L@LISTSERV.ND.EDU]
<b>On Behalf Of </b>Crowe, Sheila<br>
<b>Sent:</b> Tuesday, May 01, 2012 2:15 PM<br>
<b>To:</b> RESNET-L@LISTSERV.ND.EDU<br>
<b>Subject:</b> Re: SOHO WiFi routers and residential networking<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thank you to Rand, Bruce =
and my hero, Adam Brock. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">A bit more detailed infor=
mation to help all the Cisco network guru types help me. To recapR=
30;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">We have 2 housing areas:&=
nbsp; residence halls and family and graduate apartments. Both areas =
have Cisco 2960 layer 2 switches and Cisco 3750 fiber switches. In
the residence halls we have one wired port per pillow and almost ubiquitou=
s wireless coverage via Aruba APs and a single controller. ResNet is =
charged as part of the room and board in the residence halls.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">We don’t provide wi=
reless coverage in family and graduate housing. Our family housing ar=
ea was wired about 13 years ago and provided only one wired jack per
apartment; because of that, virtually every customer in family housing use=
s a soho wireless router. Prior to our upgrade in June, we were using=
3Com fiber switches and Cisco 2960 layer 2 switches, When we upgraded this=
section of our network (from 3Com fiber
switches to Cisco 3750s), we immediately had a BIG problem with our networ=
k dropping in family housing; no problems in the res halls. Backwards=
soho routers were not the problem because we use DHCP snooping. Prior to t=
he upgrade, our network ran like a scalded
cat in FGH. It was ultimately decided that the problem was caused by=
the larger concentration of SOHO wireless routers in that area producing u=
nicast packet floods. Our team has discovered that Cisco switches hav=
e a feature called flood blocking that will
block unicast and multicast floods at the switchport level. We are d=
eploying this slowly. I am told that it is NOT Cisco’s Storm Co=
ntrol.</span><span style=3D"font-size:11.0pt;font-family:"Calibri"=
;,"sans-serif"">
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif""><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">My questions, slightly re=
-phrased:
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"m=
so-list:Ignore">1.<span style=3D"font:7.0pt "Times New Roman"">&n=
bsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">For those of y=
ou who have a similar network, do you utilize either Storm Control or flood=
blocking? Why do you use one rather than the other?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"m=
so-list:Ignore">2.<span style=3D"font:7.0pt "Times New Roman"">&n=
bsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">Do you use som=
e other measure to deal with unicast packet floods?
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"m=
so-list:Ignore">3.<span style=3D"font:7.0pt "Times New Roman"">&n=
bsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">Considering th=
e physical environment (single wired jacks), what do you feel is best pract=
ice when it comes to stopping unicast packet floods?
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><o:p> </o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">If you need more detail f=
rom me, please ask. Any information or feedback is appreciated. =
If you prefer, please feel free to contact me off-list.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Thank you!
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Sheila Crowe<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">MSU ResNet<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><a href=3D"mailto:sheila@=
montana.edu">sheila@montana.edu</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif""><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"=
;Tahoma","sans-serif"">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:"Tahoma","sans-serif""> Resnet F=
orum
<a href=3D"mailto:[mailto:RESNET-L@LISTSERV.ND.EDU]">[mailto:RESNET-L@LISTS=
ERV.ND.EDU]</a>
<b>On Behalf Of </b>Osborne, Bruce W<br>
<b>Sent:</b> Tuesday, May 01, 2012 5:48 AM<br>
<b>To:</b> <a href=3D"mailto:RESNET-L@LISTSERV.ND.EDU">RESNET-L@LISTSERV.ND=
.EDU</a><br>
<b>Subject:</b> Re: SOHO WiFi routers and residential networking<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">That is only the port par=
t of the configuration. There are some global settings too.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Also, your switch uplink =
or the switch port with the DHCP server needs to be trusted for this to fun=
ction correctly. The three processes used here are “ARP
inspection”, “DHCO snooping”, and “IP source guard=
”. The features can vary, depending on your model of switch.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D">Here is one example of Ci=
sco’s documentation. This one is for 3550 switches.
<a href=3D"http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/softwa=
re/release/12.2_25_see/configuration/guide/swdhcp82.html">
http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/=
12.2_25_see/configuration/guide/swdhcp82.html</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><b><=
span style=3D"font-size:10.0pt;font-family:"Verdana","sans-s=
erif";color:#001B3E">Bruce Osborne</span></b><span style=3D"font-size:=
10.0pt;font-family:"Verdana","sans-serif";color:#001B3E=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><i><=
span style=3D"font-size:10.0pt;font-family:"Verdana","sans-s=
erif";color:#001B3E">Network Engineer</span></i><span style=3D"font-si=
ze:10.0pt;font-family:"Cambria","serif";color:#1F497D">=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><b><=
span style=3D"font-size:10.0pt;font-family:"Verdana","sans-s=
erif";color:#001B3E">IT Network Services</span></b><span style=3D"font=
-size:10.0pt;font-family:"Cambria","serif";color:#1F497=
D"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><spa=
n style=3D"font-size:10.0pt;font-family:"Verdana","sans-seri=
f";color:#001B3E"> </span><span style=3D"font-size:10.0pt;font-fa=
mily:"Cambria","serif";color:#1F497D"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><b><=
span style=3D"font-size:10.0pt;font-family:"Verdana","sans-s=
erif";color:#001B3E">(434) 592-4229</span></b><span style=3D"font-size=
:10.0pt;font-family:"Cambria","serif";color:#1F497D"><o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><spa=
n style=3D"font-size:10.0pt;font-family:"Verdana","sans-seri=
f";color:#001B3E"> </span><span style=3D"font-size:10.0pt;font-fa=
mily:"Cambria","serif";color:#1F497D"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><b><=
span style=3D"font-size:10.0pt;font-family:"Verdana","sans-s=
erif";color:#AA0000">LIBERTY UNIVERSITY<o:p></o:p></span></b></p>
<p class=3D"MsoNormal" style=3D"margin-right:.5in;text-autospace:none"><i><=
span style=3D"font-size:11.0pt;font-family:Times-Roman;color:#AA0000">Train=
ing Champions for Christ since 1971<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";color:#1F497D"><o:p> </o:p></span><=
/p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"=
;Tahoma","sans-serif"">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:"Tahoma","sans-serif""> Hall, Ra=
nd
<a href=3D"mailto:[mailto:hallr@MERRIMACK.EDU]">[mailto:hallr@MERRIMACK.EDU=
]</a> <br>
<b>Sent:</b> Monday, April 30, 2012 12:39 PM<br>
<b>Subject:</b> Re: SOHO WiFi routers and residential networking<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Sheila,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Good luck blocking rogues. :-) Your best bet is to h=
old to your commitment to providing service to the jack. To that you can ad=
d some basic best practice suggestions to people who want to try using a wi=
reless router or bridge (enable encryption,
negotiate channel selection with neighbors, etc).<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Your network folks will want to turn on DHCP Snoopin=
g. Sometimes a resident will plug a router in "backwards" and off=
er up DHCP leases to their neighbors--not a pretty sight. If they are new t=
o Cisco they might appreciate a sample interface
config for some ideas. Feel free to share:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"> switchport access vlan xx<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> switchport mode access<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> switchport protected<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> switchport port-security maximum 6<o:p></o:p><=
/p>
</div>
<div>
<p class=3D"MsoNormal"> switchport port-security<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> switchport port-security aging time 1<o:p></o:=
p></p>
</div>
<div>
<p class=3D"MsoNormal"> switchport port-security violation restrict<o:=
p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> switchport port-security aging type inactivity=
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> ip arp inspection limit rate 15 burst interval=
10<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> storm-control broadcast level pps 50 10<o:p></=
o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> storm-control multicast level pps 50 10<o:p></=
o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> spanning-tree portfast<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> spanning-tree bpduguard enable<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> ip verify source<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> ip dhcp snooping limit rate 10<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> <o:p></o:p>=
</p>
</div>
<div>
<p class=3D"MsoNormal">Rand<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Rand P. Hall<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Director, Network Services &n=
bsp; askI=
T!<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Merrimack College<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"tel:978-837-3532" target=3D"_blank">978-8=
37-3532</a><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"mailto:rand.hall@merrimack.edu" target=3D=
"_blank">rand.hall@merrimack.edu</a><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:"Ver=
dana","sans-serif";color:#555555">If I had an hour to save t=
he world, I would spend 59 minutes defining the problem and one minute find=
ing solutions. – Einstein</span>
<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<p class=3D"MsoNormal">On Fri, Apr 27, 2012 at 1:48 PM, Crowe, Sheila <<=
a href=3D"mailto:sheila@montana.edu" target=3D"_blank">sheila@montana.edu</=
a>> wrote:<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">In early March, I participated in a thread started by Jeannie Abne=
y about what other schools’ polices are for residents bringing person=
al wireless routers onto your network. I
added some questions pertaining to single family apartments (vs. residence=
halls) and got some great feedback. I would like to take it a step f=
urther and ask some more questions based on the type of network that we hav=
e.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">We have a Cisco network, a core at the origin of the commodity int=
ernet pipe, and a subnet for each of our buildings (really areas). In=
the residence halls we have a large Aruba
wireless network installed so that every building is blanketed for secure =
wireless internet access. In the residence halls, ResNet is cha=
rged out to every resident regardless of whether they use it or not.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">We do not provide ubiquitous wireless coverage in family housing b=
ecause ResNet is an opt-in service. Additionally, our family housing area w=
as wired about 13 years ago and only
provided one wired jack per apartment. As I’m sure you can imagine, =
virtually every customer in family housing has a soho wireless router. =
; When we upgraded this section of our network (from 3Com switches to Cisco=
), we immediately had a BIG problem with our
network dropping constantly. It was ultimately decided that it was t=
he SOHO wireless routers causing the problem; namely, unicast packet floods=
through our Cisco switch ports. Only recently it was discovered that Cisco=
switches have a feature that will block
unicast and multicast floods. We are deploying this slowly. <o=
:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Now for the questions. For those of you who have a similar network=
, do you employ this Cisco feature or do you simply block all “rogue&=
#8221; wireless connections? Or do you have another
measure in place to deal with the unicast packet floods? Also, do yo=
ur network engineers consider this a stopgap measure (“band-aid”=
;) to deal with residences where you do not offer WiFi?
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Please do share all of the details about this issue (or non-issue)=
on your network as you know them. And thanks a million!
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Sheila Crowe<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Montana State University ResNet<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><a href=3D"tel:406.994.4230" target=3D"_blank">406.994.4230</a><o:=
p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><a href=3D"tel:406.209.7243" target=3D"_blank">406.209.7243</a><o:=
p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">P.S. I’m hoping to see all of you at the 2012 Student Techno=
logy Conference at Claremont Colleges!
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"> <o:p></o:p></p>
</div>
</div>
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