[RndTbl] Load-balancing / dual-WAN / multi-WAN routers or other solutions

[Hartmut W Sager]

Wow, that is a winning reply!  Thanks, Trevor.

Hartmut Sager


On 31 March 2013 02:47, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> On 2013-03-29 Hartmut W Sager wrote:
> > Now THIS should get a discussion going.  What's the latest on
> > load-balancing / dual-WAN / multi-WAN routers?  I only see two kinds
> > - some very old D-Link (DI-LB604) and Cisco (RV042, RV082, RV016)
> > models, and quite a few current models from completely unheard of
> > Oriental companies.
>
> I've done multi-homed Linux routers.  To do weird stuff without buying
> major expensive gear (read: Cisco enterprise, Juniper, etc) your best
> bet is to just do it in Linux (or BSD if you prefer, though I have no
> experience there).
>
> You can select what traffic should go out what modem (by nearly any
> criteria since it is iptables based).  I usually select it based on
> port (put VNC, ssh over low-latency pipes) or intranet IP (give certain
> machines fast / slow internet).  Return packets come in the same modem
> as the outgoing.
>
> I haven't yet done automatic failover but it should be fairly easy to
> write a script to detect pipe failure and tweak iptables to direct all
> traffic out just one pipe.
>
> Your friends here are:
>
> ip rule ... table
> ip route ... table
> iptables
> echo 0 > /proc/sys/net/ipv4/conf/eth0/rp_filter
> iptables -t mangle
> tc
> (and maybe more I'm forgetting, this is from memory at the moment!)
>
> and you can do QoS fairly easily at the same time.
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