Re: can single linux box with dual gateway provide two separate connection ?

["J. Bakshi" <joydeep@infoservices.in>]

J. Bakshi wrote:
> Hello list,
>
> This is not the traditional load-balancing or fail over technique which
> I like to achieve through iptables but the objective is different.  I
> have 2 different ISP connections. The Linux server is presently using
> one ISP as well as do ip-forward to make it available for the LAN
> users.  I have achieved this by
>
> ` ` `
> echo 1 > /proc/sys/net/ipv4/ip_forward
>
> iptables -A FORWARD -i ${WAN_IFACE} -o ${LAN_IFACE} -s 192.168.0.0/24 -m \
> conntrack --ctstate NEW -j ACCEPT
> iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
> iptables -A POSTROUTING -t nat -j MASQUERADE
> ` ` `
>
> cool. Now Some thing extra which I like to achieve. I like to put the
> second ISP too into the server and use the above style iptables to
> forward it to another lan card so that both the connection will be
> available *separately* from the same server. Obviously server can choose
> any one of these as its own gateway. Got the idea ? not a load-balancing
> setup but the server will act as two separate modem actually to provide
> two connections. I have followed
>
>  http://www.generationip.com/documentation/network-documentation/93-howto-setup-multi-default-gateway-on-linux
>
>
> to configure the routing tables for these two ISPs. Frankly telling you
> I have become a little confused now. Shall I now simply apply the above
> iptable rules for the two connections or some thing more is required to
> achieve this ? Obviously I can continue doing experiment to know the
> answer but the server where I am working is acting as the default
> gateway;  hence my liberty is also restricted to do this very
> experiment.  could any one help me out to come out from this very
> confusing stage ?
> Thanks
>
>   

Any hints from anyone ?


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