Limit number of connections

[Hitamashi]

Hello,

I would like to ask about the number of connections that wstunnel can keep at a same time (for the server side).
I have done some tests and the result shows that it could hold around 500 connections.
Is there a limit in the number of connections that 1 process of wstunnel can hold? Is it set anywhere in the code?

Thanks

[erebe]

Hello,
There is no limit regarding the number of connections.
But by default on Linux there is a limit of the maximum of number of file descriptor a process can open at the same time. This limit is by default 1024, which would explains your limit of ~500 connections as wstunnel open 2 file descriptors for every in-coming connections.

To get your current limit just do in a shell a ulimit -a and look at the line
Maximum number of open file descriptors (-n) 1024
to get your current maximum.

to increase the limit just do a ulimit -n 999999 as root in the shell where you launch wstunnel (server and client)

You can try with this setup, run each command in a dedicated shell
sudo -i; ulimit -n 999999; wstunnel --server ws://127.0.0.1:1110
sudo -i; ulimit -n 999999; wstunnel -L 1111:127.0.0.1:1112 ws://localhost:1110
sudo -i; ulimit -n 999999; python2 -m SimpleHTTPServer 1112

and use wrk to inject http request :
sudo -i; ulimit -n 999999; wrk -t10 -c1000 http://127.0.0.1:1111
and you can see that there is no error with the connections.

[erebe]

closing as no answer