Limit IPv4/24 connections

[Valentin V. Bartenev]

On Saturday 14 January 2012 18:04:00 Valentin V. Bartenev wrote:
> On Saturday 14 January 2012 17:27:53 double wrote:
> > 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;
> 
>    # this captures only first 3 bytes of $binary_remote_addr:
> 
>    if ($binary_remote_addr ~ "^(\C{3})") {
>        set $remote_addr_24 $1;
>    }
> 
> 

 or:

 map $binary_remote_addr $remote_addr_24 {
     default             "";
     ~^(?P<bytes>\C{3})  $bytes;
 }

 wbr, Valentin V. Bartenev