[OpenSIPS-Users] UDP Fragmentation

[Bogdan-Andrei Iancu]

Hi Antonis,

The fragmentation is controlled by OS, not OpenSIPS. The only think you 
may try to do at opensips level is to reduce the size of the SIP 
packages, with topo hiding for example. But not the case here, for a 
REGISTER :(

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Bootcamp 5-16 Dec 2022, online
   https://www.opensips.org/training/OpenSIPS_eBootcamp_2022/

On 11/21/22 9:49 AM, Antonis Psaras wrote:
>
> Dear Team
>
> I have a strange issue and I need you thoughts.
>
> We have an installation with 1700 devices registered on an OpenSIPs 
> 2.4 latest running on Centos 7 on a XenServer Virtualization. For some 
> reason, some replies from OpenSIPs to the devices is fragmented to 
> 48b. Is that something that controlled by OpenSIPs or OS? Why could 
> something like that be occurred?
>
> Example of normal packet
>
> 09:43:12.375943 IP 172.21.111.10.5060 > 172.24.4.14.5070: SIP: SIP/2.0 
> 200 OK
>
> E....Y at .@.....o
>
> ............SIP/2.0 200 OK
>
> Via: SIP/2.0/UDP 
> 172.24.4.14:5070;received=172.24.4.14;branch=z9hG4bKb65a2607229aaf9b5;rport=5070
>
> From: "1110401" <sip:1110401 at 172.21.111.10>;tag=199725f5b3
>
> To: "1110401" 
> <sip:1110401 at 172.21.111.10>;tag=4074.edeca69b8a0dee9664e1f1fc59897b8c
>
> Call-ID: 450061df04238489
>
> CSeq: 1782007243 REGISTER
>
> Contact: <sip:9590401 at 172.24.4.14:5070;transport=udp>;q=1;expires=600
>
> Content-Length: 0
>
> And just after that other replies to other device fragmented
>
> 09:43:12.483483 IP 172.21.111.10.5060 > 10.122.2.71.5060: SIP
>
> E.. .. at .@._...o
>
> z.G......'.....................
>
> 09:43:12.483563 IP 172.21.111.10.5060 > 172.29.20.26.5070: SIP
>
> E.. .. at .@.v...o
>
> ...........t....................
>
> 09:43:12.483597 IP 172.21.111.10.5060 > 172.29.19.25.5080: SIP
>
> E.. .. at .@..Y..o
>
> ...........s....ONS sip:172.21.1
>
> 09:43:12.483632 IP 172.21.111.10.5060 > 10.122.7.44.48577: SIP
>
> E.. .. at .@.....o
>
> z.,......,.....2.0 200 OK
>
> Via:
>
> Thank you for your thoughts in advance
>
> *Antonis Psaras*
>
>
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