From: Chuck Church (cchurch@xxxxxxxxxxxx)
Date: Thu Aug 02 2001 - 19:03:33 GMT-3
Looks like the path-MTU algorithm isn't functioning correctly on your end
systems. You might be better off setting the MTU manually on the end
systems to 1480 or slightly below. It's in INETCFG for NetWare, and a
registry hack for NT. Not sure about UNIX. Is the link overloaded, or just
poor quality?
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Chris Allen
Sent: Thursday, August 02, 2001 3:51 PM
To: ccielab@groupstudy.com
Subject: Fragment Timeout
Does anyone know how to (if you can) increase the timeout value for
Fragmentation/Reassembly. I have a link that has major delay and timeouts
when trying to receive supplemental frags. If you look below you will see
this happening from the debug output, also you can see the frag timeout
statistics by typing sho ip traffic. So does anyone know how to increase
that time?
WK01R00#debug ip packet 109
IP packet debugging is on for access list 109
WK01R00#term mon
WK01R00#
Aug 3 03:32:49: IP: recv fragment from 10.223.100.251 offset 0 bytes
Aug 3 03:32:49: IP: recv fragment from 10.223.100.251 offset 1480 bytes
Aug 3 03:32:51: IP: recv fragment from 10.223.104.251 offset 0 bytes
Aug 3 03:32:51: IP: recv fragment from 10.223.104.251 offset 1480 bytes
Aug 3 03:32:53: IP: recv fragment from 10.223.120.251 offset 0 bytes
Aug 3 03:32:53: IP: recv fragment from 10.223.120.251 offset 1480 bytes
Aug 3 03:32:55: IP: recv fragment from 10.225.102.14 offset 0 bytes
Aug 3 03:32:55: IP: recv fragment from 10.225.102.14 offset 1480 bytes
Aug 3 03:32:57: IP: recv fragment from 10.223.100.251 offset 0 bytes
Aug 3 03:32:57: IP: recv fragment from 10.223.100.251 offset 1480 bytes
WK01R00#sho ip traff
IP statistics:
Rcvd: 603896 total, 357929 local destination
0 format errors, 0 checksum errors, 3 bad hop count
0 unknown protocol, 9 not a gateway
0 security failures, 0 bad options, 0 with options
Opts: 0 end, 0 nop, 0 basic security, 0 loose source route
0 timestamp, 0 extended security, 0 record route
0 stream ID, 0 strict source route, 0 alert, 0 cipso
0 other
Frags: 306 reassembled, 724 timeouts, 0 couldn't reassemble
2273 fragmented, 0 couldn't fragment
Bcast: 105476 received, 95453 sent
Mcast: 167923 received, 229759 sent
Sent: 446019 generated, 202315 forwarded
Drop: 1465 encapsulation failed, 0 unresolved, 0 no adjacency
33770 no route, 0 unicast RPF, 0 forced drop
=====================================
Chris Allen ~ ccnp ccdp
Network Consultant
856.220.1741 Cell
8665HELPER Pager
chrisall@callisma.com
=====================================
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