[Serusers] Problem with MTU size in SER with MIPv6.

[Jose Angel Calvo]

Thank you for your help and sorry for my english.
I have a problem with mipv6 and a server SIP, SER (SIP Express Router).
The mipv6 path is  "mipv6-2.0.2"  in  kernel  2.6.16.24-Ubuntu.

The problem occurs when a packet is too big (it must be fragmented), and go to the node what makes function of P-CSCF (Proxy in SIP) and Correspondent Node. If the P-CSCF is not a CN, all is OK. But if the node is CN, then i have the problem. The SER logs are:

................
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: SER: new INVITE 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: parse_headers: flags=-1 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: check_via_address(2001:720:1500:1B:FCFD:FF:FE0C:103, [2001:720:1500:1B:FCFD:FF:FE0C:103], 3) 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: ERROR: warning_builder: buffer size exceeded 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: WARNING: warning skipped -- too big 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: WARNING:vqm_resize: resize(0) called 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: DEBUG: reply sent out.
 buf=0x8106270: SIP/2.0 1..., shmem=0xb5e8b330: SIP/2.0 1 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: DEBUG: _reply_light: finished 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: DEBUG: mk_proxy: doing DNS lookup... 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8051]: check_via_address(2001:720:1500:1B:FCFD:FF:FE0C:103, [2001:720:1500:1B:FCFD:FF:FE0C:103], 3) 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8068]: DBG: tcp_main_loop: dead child 2 (shutting down?) 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: child process 8051 exited by a signal 11 
Nov 20 18:28:25 pcscfD kernel: [4296472.851000]  <0>skb_under_panic: text:c02d2aad len:321 put:14 head:d62cfc00 data:d62cfbea tail:d62cfd2b end:d62cfd80 dev:eth0
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: core was not generated 
Nov 20 18:28:25 pcscfD kernel: [4297162.639000] ------------[ cut here ]------------
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: INFO: terminating due to SIGCHLD 
Nov 20 18:28:25
 pcscfD kernel: [4297162.639000] kernel BUG at net/core/skbuff.c:112!
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8059]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8052]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8053]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8054]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8055]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8056]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8057]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8058]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8060]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8061]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8062]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8063]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD
 /usr/sbin/ser[8064]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8065]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8066]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8067]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8068]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8050]: INFO: signal 15 received 
Nov 20 18:28:25 pcscfD kernel: [4297162.639000] invalid opcode: 0000 [#3]
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8059]: Memory status (pkg): 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8052]: Memory status (pkg): 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8053]: Memory status (pkg): 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8054]: Memory status (pkg): 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8055]: Memory status (pkg): 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8056]: Memory status (pkg): 
.......................
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: hash =
 2055 fragments no.:     1, unused:     0 ^I^I bucket size:   1048576 -   2097152 (first   1572864) 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: hash = 2059 fragments no.:     1, unused:     0 ^I^I bucket size:  16777216 -  33554432 (first  31934160) 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: TOTAL:     26 free fragments = 33537656 free bytes 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: ----------------------------- 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: shm_mem_destroy 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: destroying the shared memory lock 
Nov 20 18:28:25 pcscfD /usr/sbin/ser[8049]: terminating due to SIGCHLD 
##############################################################
The problem is in the MTU size, because if the packet is not fragmented, there is not a problem. But the INVITE packet
 needs to fragment, what it means, i always have the same problem.

My questions are:

- Have anybody the same o similar problem?
- The MTU size is a problem in SER?
- Have anybody sent fragmented packets with SER?

Thanks for your help.





		
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