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
