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<DIV><FONT face=Arial size=2>If they werent there before, it means someone added
them, likely the person in charge of bgp rtr config for that as #</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> Brian</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jpalmer@utilinc.com href="mailto:jpalmer@utilinc.com">Palmer,
John</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nanog@merit.edu
href="mailto:nanog@merit.edu">nanog@merit.edu</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, November 27, 2002 1:06
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Broken Netmask?</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">We have a /23
(199.5.156/23) and seem to be having a problem with our ISP (Network Access
Solutions - NAS<SPAN class=GramE>) .</SPAN><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">We do not do our own route
advertising - they do it for us and route the block to our
connection.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">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 <SPAN class=GramE>its</SPAN> a netmask
problem.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">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 <SPAN class=GramE>dont
block</SPAN> these ports nor do they.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">NAS seems to be light on
technical talent and can't seem to solve this
problem.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">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)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">BGP routing table entry
for 199.5.156.0/23, version 6041537<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Paths: (6 available, best
#1)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Advertised to
peer-groups:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>AS4544-INTERNAL
AS4544-CLIENT AS4544-HOT-ROUTE AS4544-DATA-CENTER<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes">
</SPAN>AS4544-CORE-CUSTOMER-FULL<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 13953 13953
13953 13953 13953<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>206.220.243.177 from
206.220.243.177 (66.28.1.8)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Origin IGP,
metric 100, localpref 80, valid, external, best<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Community:
4544:300<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 13953 13953
13953 13953 13953, (received-only)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>206.220.243.177 from
206.220.243.177 (66.28.1.8)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Origin IGP,
metric 30802, localpref 100, valid, external<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 13953 13953
13953 13953 13953, (received & used)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>206.204.251.196 (metric
113851) from 206.204.251.196 (206.204.251.196)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Origin IGP,
metric 100, localpref 80, valid, internal<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Community:
4544:300 4544:5005<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>16631 16631 16631 13953 13953 13953
13953 13953 13953, (received & used)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>206.204.251.206 (metric
43484) from 206.204.251.206 (206.204.251.206)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Origin IGP,
metric 100, localpref 80, valid, internal<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Community:
4544:300 4544:5001<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>6461 16631 16631 16631 13953 13953
13953 13953 13953 13953<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>206.220.243.71 from
206.220.243.71 (207.126.96.35)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Origin IGP,
metric 110, localpref 80, valid, external<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Community:
4544:300<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>6461 16631 16631 16631 13953 13953
13953 13953 13953 13953, (received-only)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>206.220.243.71 from
206.220.243.71 (207.126.96.35)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-spacerun: yes"> </SPAN>Origin IGP,
metric 1295, localpref 100, valid, external<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">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).<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">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.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">Any help would be
appreciated. NAS doesn't seem to have a clue.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="mso-layout-grid-align: none"><FONT
face="Courier New" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML>