[53807] in North American Network Operators' Group
Re: Broken Netmask?
daemon@ATHENA.MIT.EDU (Brian)
Wed Nov 27 16:43:41 2002
From: "Brian" <bri@sonicboom.org>
To: <nanog@merit.edu>
Date: Wed, 27 Nov 2002 13:44:20 -0800
Errors-To: owner-nanog-outgoing@merit.edu
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If they werent there before, it means someone added them, likely the =
person in charge of bgp rtr config for that as #
Brian
----- Original Message -----=20
From: Palmer, John=20
To: nanog@merit.edu=20
Sent: Wednesday, November 27, 2002 1:06 PM
Subject: Broken Netmask?
We have a /23 (199.5.156/23) and seem to be having a problem with our =
ISP (Network Access Solutions - NAS) .
=20
We do not do our own route advertising - they do it for us and route =
the block to our connection.
=20
The problem is that the second part of the block (199.5.157.0 - =
199.5.157.255) seems to be mis-routed within the ISP's network. I think =
its a netmask problem.
=20
The symptoms are that packets get through from some destinations and =
not from others. Also, packets sometimes fail based on port numbers (ie: =
if I come from x.y.z.w to 199.5.157.x on port 80, it works but not from =
x.y.z.w to 199.5.157.x on port 25) Furthermore, the port and source =
addresses that have problems changes over time (ie: x.y.z.w to port 25 =
will work tommorrow). We dont block these ports nor do they.
=20
NAS seems to be light on technical talent and can't seem to solve this =
problem.
=20
Interesting note, if you check 199.5.157.1 bgp from any of the looking =
glass websites you get multiple occurrences of NAS (and other AS =
numbers): ie: (from AADS)
=20
BGP routing table entry for 199.5.156.0/23, version 6041537
Paths: (6 available, best #1)
Advertised to peer-groups:
AS4544-INTERNAL AS4544-CLIENT AS4544-HOT-ROUTE AS4544-DATA-CENTER
AS4544-CORE-CUSTOMER-FULL
16631 16631 16631 13953 13953 13953 13953 13953 13953
206.220.243.177 from 206.220.243.177 (66.28.1.8)
Origin IGP, metric 100, localpref 80, valid, external, best
Community: 4544:300
16631 16631 16631 13953 13953 13953 13953 13953 13953, =
(received-only)
206.220.243.177 from 206.220.243.177 (66.28.1.8)
Origin IGP, metric 30802, localpref 100, valid, external
16631 16631 16631 13953 13953 13953 13953 13953 13953, (received & =
used)
206.204.251.196 (metric 113851) from 206.204.251.196 =
(206.204.251.196)
Origin IGP, metric 100, localpref 80, valid, internal
Community: 4544:300 4544:5005
16631 16631 16631 13953 13953 13953 13953 13953 13953, (received & =
used)
206.204.251.206 (metric 43484) from 206.204.251.206 =
(206.204.251.206)
Origin IGP, metric 100, localpref 80, valid, internal
Community: 4544:300 4544:5001
6461 16631 16631 16631 13953 13953 13953 13953 13953 13953
206.220.243.71 from 206.220.243.71 (207.126.96.35)
Origin IGP, metric 110, localpref 80, valid, external
Community: 4544:300
6461 16631 16631 16631 13953 13953 13953 13953 13953 13953, =
(received-only)
206.220.243.71 from 206.220.243.71 (207.126.96.35)
Origin IGP, metric 1295, localpref 100, valid, external
=20
Notice the multiple occurrences of 16631 and 13953. I know there are =
valid reasons to add multiple occurrences, but can anyone tell if this =
is broken? These duplicate numbers are new - they were'nt there before =
(when things worked).
=20
The intermittant failure problem reminds me of a time when someone's =
IGRP had a bad netmask somwhere. I'm wondering if they may have a /24 =
netmask internally somewhere and not a /23 like they should.
=20
Any help would be appreciated. NAS doesn't seem to have a clue.
=20
=20
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<DIV><FONT face=3DArial size=3D2>If they werent there before, it means =
someone added=20
them, likely the person in charge of bgp rtr config for that as =
#</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2> Brian</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Djpalmer@utilinc.com =
href=3D"mailto:jpalmer@utilinc.com">Palmer,=20
John</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dnanog@merit.edu=20
href=3D"mailto:nanog@merit.edu">nanog@merit.edu</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, November 27, =
2002 1:06=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Broken Netmask?</DIV>
<DIV><BR></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">We have a /23=20
(199.5.156/23) and seem to be having a problem with our ISP (Network =
Access=20
Solutions - NAS<SPAN class=3DGramE>) =
.</SPAN><o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">We do not do our =
own route=20
advertising - they do it for us and route the block to our=20
connection.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">The problem is =
that the=20
second part of the block (199.5.157.0 - 199.5.157.255) seems to be =
mis-routed=20
within the ISP's network. I think <SPAN class=3DGramE>its</SPAN> a =
netmask=20
problem.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">The symptoms are =
that=20
packets get through from some destinations and not from others. Also, =
packets=20
sometimes fail based on port numbers (ie: if I come from x.y.z.w to=20
199.5.157.x on port 80, it works but not from x.y.z.w to 199.5.157.x =
on port=20
25) Furthermore, the port and source addresses that have problems =
changes over=20
time (ie: x.y.z.w to port 25 will work tommorrow). We <SPAN =
class=3DGramE>dont=20
block</SPAN> these ports nor do they.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">NAS seems to be =
light on=20
technical talent and can't seem to solve this=20
problem.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Interesting =
note, if you=20
check 199.5.157.1 bgp from any of the looking glass websites you get =
multiple=20
occurrences of NAS (and other AS numbers): ie: (from=20
AADS)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">BGP routing =
table entry=20
for 199.5.156.0/23, version 6041537<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Paths: (6 =
available, best=20
#1)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>Advertised to=20
peer-groups:<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>AS4544-INTERNAL=20
AS4544-CLIENT AS4544-HOT-ROUTE =
AS4544-DATA-CENTER<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =20
</SPAN>AS4544-CORE-CUSTOMER-FULL<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 =
13953 13953=20
13953 13953 13953<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>206.220.243.177 =
from=20
206.220.243.177 (66.28.1.8)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Origin IGP,=20
metric 100, localpref 80, valid, external, =
best<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Community:=20
4544:300<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 =
13953 13953=20
13953 13953 13953, (received-only)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>206.220.243.177 =
from=20
206.220.243.177 (66.28.1.8)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Origin IGP,=20
metric 30802, localpref 100, valid, =
external<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 =
13953 13953=20
13953 13953 13953, (received & used)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>206.204.251.196 =
(metric=20
113851) from 206.204.251.196 =
(206.204.251.196)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Origin IGP,=20
metric 100, localpref 80, valid, internal<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Community:=20
4544:300 4544:5005<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 =
13953 13953=20
13953 13953 13953, (received & used)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>206.204.251.206 =
(metric=20
43484) from 206.204.251.206 =
(206.204.251.206)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Origin IGP,=20
metric 100, localpref 80, valid, internal<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Community:=20
4544:300 4544:5001<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>6461 16631 16631 16631 13953 =
13953=20
13953 13953 13953 13953<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>206.220.243.71 =
from=20
206.220.243.71 (207.126.96.35)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Origin IGP,=20
metric 110, localpref 80, valid, external<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Community:=20
4544:300<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>6461 16631 16631 16631 13953 =
13953=20
13953 13953 13953 13953, (received-only)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> </SPAN>206.220.243.71 =
from=20
206.220.243.71 (207.126.96.35)<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN=20
style=3D"mso-spacerun: yes"> =
</SPAN>Origin IGP,=20
metric 1295, localpref 100, valid, =
external<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Notice the =
multiple=20
occurrences of 16631 and 13953. I know there are valid reasons to add =
multiple=20
occurrences, but can anyone tell if this is broken? These duplicate =
numbers=20
are new - they were'nt there before (when things=20
worked).<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">The intermittant =
failure=20
problem reminds me of a time when someone's IGRP had a bad netmask =
somwhere.=20
I'm wondering if they may have a /24 netmask internally somewhere and =
not a=20
/23 like they should.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Any help would =
be=20
appreciated. NAS doesn't seem to have a =
clue.<o:p></o:p></SPAN></FONT></P>
<P class=3DMsoNormal style=3D"mso-layout-grid-align: none"><FONT=20
face=3D"Courier New" size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: 'Courier =
New'"><o:p> </o:p></SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p> </o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTM=
L>
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