Limit IPv4/24 connections

[double]

Hello,

I would like to limit the connections to 100 per 255.255.255.0
Is there a chance e.g. to zero the last byte of "$binary_remote_addr"?

Something like:
set $remote_addr_24 "/$remote_addr/\.[0-9]*$/.0/"
limit_zone connectiontrack $remote_addr_24  16m;
limit_conn connectiontrack 100;

Thanks a lot
Markus

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,221225,221225#msg-221225