using bandwidth from multiple adsl supply connections

[Michael Tautschnig]

[...]
>
> Any idea how to achieve this OR any tutorial OR Howto
> for this.
> Help appreciated.
> Thanks for supports.
>
In fact, this is not really a problem of iptables/netfilter - it's rather 
a routing problem. The following post might answer your question:

http://www.uwsg.iu.edu/hypermail/linux/kernel/0005.3/1580.html

Regards,
Michael