[KLUG Members] load balancing router

[Patrick Stockton]

> >>Are the cable modems plugged directly (via cross-cable) to NICs in
> >>hosts or into a hub/switch?  If the modems are plugged into a switch
does
> >>the switch support VLAN?
> >The modems are connected directly in to the Nic via streight through
> >cables so no hubs or switches.
> >I was thinking I would throw a third ethernet card in to the box adjust
> >from there.  Is that the right path to explor or is there a "better" way
of
> >doing it.
>
> That is the easiest way.  You'll need to be running a 2.4.x kernel.

This will not work at all under 2.2.x?  That's what's currently on there and
working fine....



>
>
> Assuming eth0/IP1 = your internal interface and eth1/IP2, eth2/IP3 = your
cable
> modems.
>
> iptables -t nat -A POSTROUTING -s {IP1/MASK} -o eth1 -j SNAT --to {IP2}
> iptables -t nat -A POSTROUTING -s {IP1/MASK} -o eth2 -j SNAT --to {IP3}
> iptables -A FORWARD -i eth1 -m state --state NEW,INVALID -j DROP
> iptables -A FORWARD -i eth2 -m state --state NEW,INVALID -j DROP
> ip route add default scope global equalize \
>      nexthop via {IP2} dev eth1 \
>      nexthop via {IP3} dev eth2
>
> The ideal way would be to bond (EQL) the ethernet interfaces,  but then
your
> provider would need to support that on their end (doubtful).  Multipath
routing
> (as described above) is probably the next best thing.  The problem you
will
> encounter is that one connection cannot be broken over two interfaces
(since
> they have seperate IPs) so you get sort-of load balanacing much like load
> balanceing between two web servers using DNS round-robin.
>
> Systems and Network Administrator
> Morrison Industries
> 1825 Monroe Ave NW
> Grand Rapids, MI. 49505
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