Gateway load balance

Wojciech Puchar wojtek at
Wed Jun 17 18:14:08 UTC 2009

> Adding 2 more default routes with same weight to each dsl line won't work?

No, because you have to route things beginning from connection 1 subnet 
through connection 1, connection 2 subnet through connection 2 etc.

Your idea will result in routing all outgoing traffic randomly through 3 
lines. At least with polish telecom it will not work. If you have 
connection with say subnet, you have to send packets from 
that subnet.

And that's proper behaviour, as it blocks spoofing.

> ----- Original Message -----
> From: owner-freebsd-questions at <owner-freebsd-questions at>
> To: FreeBSD Users <freebsd-questions at>
> Sent: Wed Jun 17 12:18:07 2009
> Subject: Gateway load balance
> Hi all
> First time posting.
> I am a long time Linux user (desktop and server) and started with
> FreeBSD a year ago.
> Thanks to the book Absolute FreeBSD 2nd Edition I learned a lot about
> the OS and how to configure different services I used in Linux (Slackware).
> My post is regarding something I couldn't find information on how to
> implement it. Here's the situation:
> I had a proxy server (Squid + Dansguardian) under Slackware on the LAN
> which, via 'ip route' I make it use 3 gateways connected each one to an
> ADSL line and balance the requests.
> Unfortunately my server crashed and I took the oportunity to install a
> new one under FreeBSD 7.0-RELEASE. Squid and Dansguardian are working
> fine. My problem is that I don't know how to make the server use the
> other 2 gateways I have left and balance the requests on all ADSL lines.
>                      proxy
>                      1st gateway (1 NIC to LAN - 2 NIC
> to ADSL modem)
>                 2nd gateway
>                      3rd gateway
> I found it could be done with PF (also read most of The Book of PF) but
> I am quite lost about how to do it.
> Any information would be greatly appreciated.
> Thanks in advance
> Raúl I. Becette
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