ipnat + mysql replication

Olivier Nicole on at cs.ait.ac.th
Wed Jul 18 10:27:30 UTC 2007

> I have 4 FreeBSD servers in one location. A firewall/nat load balances
> between two web servers which hits a database server for content (also
> behind firewall/nat). The database server replicates from a remote
> location (outgoing connection), where the admin interface resides
> (different facility). The problem I'm having is that it's a fairly
> well-trafficked site. The ipnat entries table fills up quickly (30,000
> I think is the max), and so I have to ipnat -F fairly often (every 5
> minutes or so). The problem with this is that it kills any outgoing
> connections (like my mysql replication). Is there a way I can set the
> expiration for ipnat table entries, or setup mysql replication rules
> in ipnat.conf that will be ignored when ipnat -F is issued?

rdr has and age option to define a different time out, the redirection
for load ballencing could have a very short time out, causing your
ipnat entries to exprire quickly.

Just a guess, I never used it, but seen it from the manual.

Another, more heavy solution, but maybe more robust, would be to have
dual NIC in your mysql server and add a second firewall/nat.
The mysql replication going through the second NIC and firewall.



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