[26891] in resnet
Re: Firewall drops video conferencing packets
daemon@ATHENA.MIT.EDU (Christopher Hickernell)
Wed Oct 19 11:49:17 2011
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Message-ID: <CAF03826CDC19848A698E99DC608B54702D1B570@vEXMB1.clarion.local>
Date: Wed, 19 Oct 2011 15:46:53 +0000
Reply-To: Resnet Forum <RESNET-L@listserv.nd.edu>
From: Christopher Hickernell <chickernell@CLARION.EDU>
To: RESNET-L@listserv.nd.edu
In-Reply-To: <CAPmJfDVzb8yiQf0X=OuqxP1wYWPB_O-_FvYw2hZX6iOWdkhFVw@mail.gmail.com>
--_000_CAF03826CDC19848A698E99DC608B54702D1B570vEXMB1clarionlo_
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Just an update for those interested.
A five minute conversation with Polycom resolved our issue. Apparently the=
re is a known (but not published?) compatibility issue with the H.239 proto=
col and Cisco ASA firewalls. We disabled the H.239 protocol on our Polycom=
units and all the problems went away. We were told that disabling the pro=
tocol may cause picture quality to suffer, but we could not see a differenc=
e.
Christopher Hickernell, CCNA, MCSE
Network Support Specialist, ResNet Manager
Clarion University of Pennsylvania
Center for Computing Services
G-13 Still Hall, Clarion, PA 16214
chickernell@clarion.edu | 814.393.2218
From: Resnet Forum [mailto:RESNET-L@LISTSERV.ND.EDU] On Behalf Of William C=
onstantakos
Sent: Wednesday, October 19, 2011 11:12 AM
To: RESNET-L@LISTSERV.ND.EDU
Subject: Re: Firewall drops video conferencing packets
Had to this issue, it was the MTU
On Wed, Oct 19, 2011 at 11:08 AM, Kathleen Brown <kbrown@anselm.edu<mailto:=
kbrown@anselm.edu>> wrote:
Hello Christopher
You've probably figured your issue out by this point (I was just in here cl=
eaning up this folder, and saw your posting) but if you haven't feel free t=
o answer this or email me offline. We have a videoconferencing issue going=
on too. A Lifesize system is telling us it has a lot of dropped packets, =
but we don't see verification anyplace else, and we've spent lots of time w=
ith our firewall vendor (Juniper) to no avail. Image quality continues to =
be poor on the videoconferencing.
Kathleen Brown, Network Support Specialist
CompTIA Network+ Certified
Network Services - Office of Information Technology
Saint Anselm College
100 St. Anselm Drive
Manchester, NH 03102
(603) 641-7128<tel:%28603%29%20641-7128>
kbrown@anselm.edu<mailto:kbrown@anselm.edu>
P Please consider the environment before printing this email.
________________________________
From: Resnet Forum [mailto:RESNET-L@LISTSERV.ND.EDU<mailto:RESNET-L@LISTSER=
V.ND.EDU>] On Behalf Of Christopher Hickernell
Sent: Tuesday, September 06, 2011 10:04 AM
To: RESNET-L@LISTSERV.ND.EDU<mailto:RESNET-L@LISTSERV.ND.EDU>
Subject: Firewall drops video conferencing packets
Has anyone else experienced a problem with video conferencing traffic cross=
ing the firewall? We have various models of Polycom units (HDX 8000 HD, HD=
X 9004, VS4000) that have trouble when they have to cross our Cisco ASA to =
connect to another unit. A connection is always established, but sometimes=
video and audio do not work, sometimes content cannot be sent, etc.
Monitoring the firewall logs I observed this error:
Deny IP from Montgomery-416.itv.clarion.edu<http://Montgomery-416.itv.clari=
on.edu> to Still-111, IP options: "Router Alert"
Christopher Hickernell, CCNA, MCSE
Network Support Specialist, ResNet Manager
Clarion University of Pennsylvania
Center for Computing Services
G-13 Still Hall, Clarion, PA 16214
chickernell@clarion.edu<mailto:chickernell@clarion.edu> | 814.393.2218<tel:=
814.393.2218>
___________________________________________________ You are subscribed to t=
he ResNet-L mailing list.
To subscribe, unsubscribe or search the archives, go to http://LISTSERV.ND.=
EDU/archives/resnet-l.html ________________________________________________=
___
___________________________________________________ You are subscribed to t=
he ResNet-L mailing list.
To subscribe, unsubscribe or search the archives, go to http://LISTSERV.ND.=
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___
--
William Constantakos
Systems Administrator
Connecticut College
270 Mohegan Av.
New London, Ct 06320
___________________________________________________ You are subscribed to t=
he ResNet-L mailing list.
To subscribe, unsubscribe or search the archives, go to http://LISTSERV.ND.=
EDU/archives/resnet-l.html ________________________________________________=
___
___________________________________________________
You are subscribed to the ResNet-L mailing list.
To subscribe, unsubscribe or search the archives,
go to http://LISTSERV.ND.EDU/archives/resnet-l.html
___________________________________________________
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<div class=3D"Section1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";
color:#1F497D">Just an update for those interested.<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 five minute conversation with Polycom resolved our issue.&=
nbsp; Apparently there is a known (but not published?) compatibility issue =
with the H.239 protocol
and Cisco ASA firewalls. We disabled the H.239 protocol on our Polyc=
om units and all the problems went away. We were told that disabling =
the protocol may cause picture quality to suffer, but we could not see a di=
fference.<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"><b><span style=3D"font-size:11.0pt;font-family:"=
;Calibri","sans-serif";
color:#1F497D">Christopher</span></b><span style=3D"font-size:11.0pt;font-f=
amily:
"Calibri","sans-serif";color:#1F497D"> Hickernell, CCNA=
, MCSE<o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:"=
;Calibri","sans-serif";
color:#1F497D">Network Support Specialist, ResNet Manager<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">Clarion University of Pennsylvania<i><o:p></o:p></i></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";
color:#1F497D">Center for Computing Services<i><o:p></o:p></i></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";
color:#1F497D">G-13 Still Hall, Clarion, PA 16214<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">chickernell@clarion.edu | 814.393.2218<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"><span style=3D"font-size:11.0pt;font-family:"Ca=
libri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<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>William Constantakos<br>
<b>Sent:</b> Wednesday, October 19, 2011 11:12 AM<br>
<b>To:</b> RESNET-L@LISTSERV.ND.EDU<br>
<b>Subject:</b> Re: Firewall drops video conferencing packets<o:p></o:p></s=
pan></p>
</div>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Had to this issue, it=
was the MTU<o:p></o:p></p>
<div>
<p class=3D"MsoNormal">On Wed, Oct 19, 2011 at 11:08 AM, Kathleen Brown <=
;<a href=3D"mailto:kbrown@anselm.edu">kbrown@anselm.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"><span style=3D"color:#1F497D">Hello Christopher</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"color:#1F497D"> </span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"color:#1F497D">You've probably figured your issue o=
ut by this point (I was just in here cleaning up this folder, and saw your =
posting) but if you haven't feel free
to answer this or email me offline. We have a videoconferencing issu=
e going on too. A Lifesize system is telling us it has a lot of dropp=
ed packets, but we don't see verification anyplace else, and we've spent lo=
ts of time with our firewall vendor (Juniper)
to no avail. Image quality continues to be poor on the videoconferen=
cing. </span>
<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy"> </span><o:p></o:=
p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy"> </span><o:p></o:=
p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy">Kathleen Brown, Networ=
k Support Specialist</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy">CompTIA Network+ C=
ertified</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy">Network Services - Off=
ice of Information Technology</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy">Saint Anselm College
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy">100 St. Anselm Drive</=
span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy">Manchester, NH 03102</=
span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy"><a href=3D"tel:%28603%=
29%20641-7128" target=3D"_blank">(603) 641-7128</a></span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"font-size:10.0pt;color:navy"><a href=3D"mailto:kbro=
wn@anselm.edu" target=3D"_blank"><span style=3D"color:navy">kbrown@anselm.e=
du</span></a></span><span style=3D"color:navy"> </span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"color:#1F497D"> </span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"font-size:14.0pt;font-family:Webdings;color:#99C=
C00">P</span></b><span style=3D"font-size:8.0pt;color:#99CC00">
</span><span style=3D"font-size:8.0pt;
font-family:"Bookman Old Style","serif";color:gray">Ple=
ase consider the environment before printing this email.</span><o:p></o:p><=
/p>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center"><span=
style=3D"color:#1F497D">
<hr size=3D"2" width=3D"100%" align=3D"center">
</span></div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><span style=3D"color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b><span style=3D"font-size:10.0pt">From:</span></b><span style=3D=
"font-size:10.0pt"> Resnet Forum [mailto:<a href=3D"mailto:RESNET-L@LISTSER=
V.ND.EDU" target=3D"_blank">RESNET-L@LISTSERV.ND.EDU</a>]
<b>On Behalf Of </b>Christopher Hickernell<br>
<b>Sent:</b> Tuesday, September 06, 2011 10:04 AM<br>
<b>To:</b> <a href=3D"mailto:RESNET-L@LISTSERV.ND.EDU" target=3D"_blank">RE=
SNET-L@LISTSERV.ND.EDU</a><br>
<b>Subject:</b> Firewall drops video conferencing packets</span><o:p></o:p>=
</p>
</div>
</div>
<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">Has anyone else experienced a problem with video conferencing traf=
fic crossing the firewall? We have various models of Polycom units (H=
DX 8000 HD, HDX 9004, VS4000) that have trouble
when they have to cross our Cisco ASA to connect to another unit. A =
connection is always established, but sometimes video and audio do not work=
, sometimes content cannot be sent, etc.<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">Monitoring the firewall logs I observed this error:<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">Deny IP from
<a href=3D"http://Montgomery-416.itv.clarion.edu" target=3D"_blank">Montgom=
ery-416.itv.clarion.edu</a> to Still-111, IP options: "Router Alert&qu=
ot;<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"><b> </b><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><b>Christopher</b> Hickernell, CCNA, MCSE<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto"><i>Network Support Specialist, ResNet Manager</i><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto">Clarion University of Pennsylvania<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
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