Re: Two ADSL routers in one network
From: Bill Unruh (unruh_at_string.physics.ubc.ca)
Date: 01/25/05
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Date: 25 Jan 2005 18:58:23 GMT
Joachim Schipper <jDOTschipper@wanadoo.nl> writes:
>Boudewijn van Breukelen <b@vbreukelen.com> wrote:
>> Hi There,
>>
>> I currently have a network with one ADSL-Router with a 5MBdown/1MBup
>> line.
>> On that network I have a couple of macs, a windows machine and a linux
>> mail and webserver.
>>
>> It all works great. Now my girlfriend needs to VPN to her work from
>> home. Her boss wants to give her a new ADSL account. I told them that
>> she can just plug-in to my network but they insist on adding a new
>> line.
>> So they will install a new line with 2MBdown/1MBup.
OK. You could of course just ignore it.
It would be nicer however if they just paid some of your expenses for
yours, but I guess they worry that you might break up in 3 months.
>>
>> I was wondering if it is possible to add both ADSL routers to the
>> network.
Sure.
>> Can I use both lines at the same time?
Sure, but not in parallel. Ie you can have some addresses routed over her
network and some over yours. But you could not have half the packets for
some address going over yours and half over hers.
>> Is it possible to build a situation where the 2nd line takes over when
>> the first goes down?
I guess so but you would have to have some cron running say every 5 min which checked if
yours had gone down and switched the routing over to hers or vice-versa.
>> Is it possible to build a situation where I can add the speed of both
>> lines together so my downloads will go faster?
No. The two networks have totally different addresses. There is no way that
the remote site could know to send the return packets (your download) to
two entirely different addresses and ports. And if they did, your side
would have a hell of a time fitting them together atgain.
>> Ans if yes, does anyone know how?
>>
>> Cheers,
>>
>> Boudewijn van Breukelen
>>
>May I suggest the Linux Advanced Routing and Traffic Control howto
>(www.lartc.org)? Not light reading, but it will allow you to configure
>an old box to do all that you desire (though you'll need to do more than
>one download at a time to see the speed increase, for instance - there
>are a couple caveats).
>Also, you'd need to write your own script or find a failover program if
>you wish to make failover work.
> Joachim
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