Hello,

see:

  -
https://www.kamailio.org/wikidocs/cookbooks/5.8.x/core/#tcp_accept_iplimit

Cheers,
Daniel

On 16.07.24 16:52, Who AmI via sr-users wrote:
> Hi list,
>
> I hope you are all well?
>
> I am currently loadtesting some services internally and I am getting
> an odd error around TCP connections from the same source IP below:
>
> "/usr/sbin/kamailio[1806789]: CRITICAL: <core> [core/tcp_main.c:4459]:
> handle_new_connect(): hit the limit of connections per source IP
> (my_ip:39043) - rejecting"
>
> Its from the core the error so I was looking at the cookbooks and
> documentation but cannot get around this specific limit or find a
> configuration to tweak that fixes it.
>
> The limit only affects TCP (will affect TLS as well but I haven't got
> that far) and is 1024 it seems.
>
> Kamailio version is: 5.7.6
> OS: Ubuntu 22.04
>
> Things I have done so far:
> I have set limitNOFILE=65535 in the service file
> Set the tcp/tls_max_connections at 8192 (default is 2048)
> Increase the tcp_rd_buf_size to 16k+
>
>
> The service I am using to loadtest is SIPp with flags "-t tn" for TCP
> multisocket as this service will have much more than 1024 concurrent
> TCP connections to it from a single source IP.
>
> I think I have missed something basic here as the devel and the source
> code references: "ksr_tcp_accept_iplimit" here at line 541:
> https://github.com/kamailio/kamailio/blob/master/src/main.c#L541
>
> I cannot find a way to change this with a configuration line it seems,
> am I being blind or is my only option to build from source and change
> this?
>
> Many Thanks,
>
> John.
>
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Daniel-Constantin Mierla (@ asipto.com)
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