[Gllug] routing via a second external IP

[John Winters]

Paul Cupis wrote:
> t.clarke wrote:
>> I am currently in the process of installing another ADSL circuit in our
>> offices (regrettably due to the apallingly low speed available on ADSL at
>> our physical location  - 600Kbs if we are lucky!).  The idea is to use this
>> connection purely for telnet connection in from certain specific users/IP
>> addresses; to avoid bottlenecks at certain times when the 'nromal' ADSL line
>> is 'swamped' with websurfing traffic.
>>
>> It would seem a pity to use another Linux box to accomplish this if I can
>> simply do the following:
>>
>> 1)install another interface card in the existing Linux box, connected to the
>> new adsl circuit and router
>> 2)set up specific routes to the IP addresses concerned within the linux-box
>> routing table, so that outgoing packets do not go our via the default route
>>
>> Any reason why this should not work ??
> 
> This should just work. All you should need to do is add some static 
> routes on the Linux box to send traffic to certain destination IPs via 
> the second gateway (ADSL).
> 
> # ip route add x.x.x.x/x via y.y.y.y

Remembering of course to tell your select customers to use the right IP
address for the new ADSL line - otherwise only half the traffic
(outbound from you) will go down the new line, and if you have NAT then
it won't work at all.

John
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