Newbie question on ip_hash

WBrown at WBrown at
Wed Feb 6 17:00:05 UTC 2013

Maxim wrote on 02/06/2013 11:47:22 AM:

> The ip_hash balancing was designed to work with internet services, 
> and use of /24 networks allows it to keep users from migrating 
> between backend servers as they get new IP address on 
> reconnect/reboot (typically from the same /24 network, at least at 
> the time ip_hash was introduced) while still providing good 
> distribution between backend servers.  This probably isn't very 
> useful nowadays, but this is how it works.

Thank you for the explanation. 
> > If I am correct above, is there any way to create persistent 
> > based on the full IPv4 address? 
> There is a number of 3rd party modules available which do hash 
> calculation based on arbitrary variables, and these may be used if 
> you need a hash based on full client's IPv4 address (there is 
> $remote_addr variable).

The backend I am hoping to use nginx for works fine without persistence, I 
was just thinking it would help with troubleshooting by keeping all of a 
user's activity on one server.  That way I would have one log to check.  I 
will look into those modules.

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