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New Member

receive fragment from x.x.x.x offset 1480 bytes

A 3640 router is keeping receiving a pair of messages from a remote ISDN end 2520 router every 9 minutes and 9 or 10 seconds.

Mar 30 20:58:39: IP: recv frament from 10.5.250.14 offset 1480 bytes

Mar 30 20:58:39: IP: recv frament from 10.5.250.14 offset 0 bytes

Mar 30 20:49:29: IP: recv frament from 10.5.250.14 offset 1480 bytes

Mar 30 20:49:29: IP: recv frament from 10.5.250.14 offset 0 bytes

Mar 30 20:40:29: IP: recv frament from 10.5.250.14 offset 1480 bytes

Mar 30 20:40:29: IP: recv frament from 10.5.250.14 offset 0 bytes

The MUT setting on both ends are 1500 bytes. Total 16 remotes connect to this router over ISDN, only receive this kind of fragment from this site.

And recently all ISDN circuits and all FR PVCs on this 3640 router go down at same time somehow. Service provider said that appear to them just router was requesting TEI from CO.

Nothing is special in log file, except for this receving fragment message. The running IOS on 3640 is 11.3(10). This router has been running properly years.

I have set up a syslog server to capture more information, does any have some idea or recommendation? Thanks in advance

2 REPLIES
Bronze

Re: receive fragment from x.x.x.x offset 1480 bytes

Leonlei,

This looks like output from 'debug ip packet'. Is there any type of debugging turned on in the router?

~Zach

New Member

Re: receive fragment from x.x.x.x offset 1480 bytes

Yes, debug ip packet detial is opened for specific access-list.

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