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


Many Thanks,

John.