[SR-Users] How to disable retransmits via TCP connection? etc.

[Vitaliy Aleksandrov]

Hi,

But the fact that packet sent from a server to a client looks 
differently captured from both points says that somebody tries to "help" 
you (read SIP ALG). So I would join to Daniel's suggestion to try with TLS.

On 24/06/15 17:30, Andrey Utkin wrote:
> Thanks for all the suggestions.
> Have taken pcap dumps with commands
> tcpdump -i any -w /tmp/sip_tcp.pcap host <counterpart host>
>
> http://whdd.org/sip_tcp_server.pcap
> http://whdd.org/sip_tcp_client.pcap
>
> The only obviously bad thing I see is "[TCP Previous segment not
> captured]" mark on the packet client side dump which is the ending of
> INVITE request body.
> Googling on this message, I've found some advice at StackOverflow to
> tune TCP socket TCP_MAXSEG option.
>
>
> http://whdd.org/sip_tcp_mtu800_server.pcap
> http://whdd.org/sip_tcp_mtu800_client.pcap
>
> For this test I have set MTU to 800 on the server's only actual net
> interface, and restarted Kamailio. The situation stays the same,
> despite the packets show differently in wireshark.
> On client side, there's still "[TCP Previous segment not captured]",
> and on server side there's a mark "[TCP segment of a reassembled
> PDU]".
>
> Any review is greatly appreciated!
>