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linux server as load-balanced gateway inside a network with 2 routers using only one network interface

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Georg at Hohenberger-online

Jul 21, 2007, 2:22 PM

Post #1 of 4 (927 views)
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linux server as load-balanced gateway inside a network with 2 routers using only one network interface

hi,
i am planing to use my linux-file-server as getway for the lan

this file-server has 3 network interfaces:
Gigabit --> lan (switch)
Gigabit --> my computer
100Mbit --> lan (switch)

inside the lan there are two dsl router (my and my neighbours)

linux-file-server should do load-balancing using this routers to be the
gateway to other pc in the lan and even do port-fowarding and qos
(Quality of Service) for voice-over-ip

all this should be done over the 100mbit network interface

i would like to know if this is possible to do or not

ofcorse tips and hints would be great

thanks in advance

Georg form germany

max at rfc2324

Jul 22, 2007, 4:14 AM

Post #2 of 4 (854 views)
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Re: linux server as load-balanced gateway inside a network with 2 routers using only one network interface [In reply to]

Am Saturday, den 21 July hub Georg Hohenberger folgendes in die Tasten:

Hi!

> i am planing to use my linux-file-server as getway for the lan

> this file-server has 3 network interfaces:
> Gigabit --> lan (switch)
> Gigabit --> my computer
> 100Mbit --> lan (switch)

> inside the lan there are two dsl router (my and my neighbours)

> linux-file-server should do load-balancing using this routers to be the
> gateway to other pc in the lan and even do port-fowarding and qos
> (Quality of Service) for voice-over-ip

> all this should be done over the 100mbit network interface

Sorry, I don´t get what you want to do.
What exactly should your file-server load-balance?
The access to the internet using both DSL routers?

Ciao
Max
--
Follow the white penguin.

max at rfc2324

Jul 22, 2007, 10:06 AM

Post #3 of 4 (860 views)
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Re: linux server as load-balanced gateway inside a network with 2 routers using only one network interface [In reply to]

Am Sunday, den 22 July hub Georg Hohenberger folgendes in die Tasten:

Hi!

Please reply to the list, so everone can answer and read the mail.
I redirected the thread to the list again.

> Maximilian Wilhelm schrieb:
> >Sorry, I don´t get what you want to do.
> >What exactly should your file-server load-balance?
> >The access to the internet using both DSL routers?

> yes, inside my lan there are 2 routers which schould be used by my
> server to do load-balancing to share a gateway to the other pc's in my lan

That should be possible.

The basic concept is to point the default gateway of all your boxes to
your linux box and let the linux box decide where to push the traffic
along.

If you just have two normal DSL lines you will most probably not be
able to do *real* loadbalancing as your ISP would have to help you.

What you can do is to push different types of connections along the
two routers, but you have to take care the a connection (e.g. a ssh
session) is routed along the same path while active.

So you may want to set up two routing tables on your linux box (one
for each DSL router which becomes default gateway in that table) and
set up some iptables rules which decide which traffic should be routed
via which routing table (think: DSL router).

Have a look at
http://lists.netfilter.org/pipermail/netfilter/2007-June/069142.html
to get an idea about how to set something like this up (It is not an
exact example, just a similar one, but the general idea should become
clear)

HTH
Ciao
Max
--
Follow the white penguin.

Georg at Hohenberger-online

Jul 22, 2007, 10:59 AM

Post #4 of 4 (851 views)
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Re: linux server as load-balanced gateway inside a network with 2 routers using only one network interface [In reply to]

Thank you Maximilian, I think thats exactly what I need

Georg from Germany

Maximilian Wilhelm schrieb:
> Am Sunday, den 22 July hub Georg Hohenberger folgendes in die Tasten:
>
> Hi!
>
> Please reply to the list, so everone can answer and read the mail.
> I redirected the thread to the list again.
>
>
>> Maximilian Wilhelm schrieb:
>>
>>> Sorry, I don´t get what you want to do.
>>> What exactly should your file-server load-balance?
>>> The access to the internet using both DSL routers?
>>>
>
>
>> yes, inside my lan there are 2 routers which schould be used by my
>> server to do load-balancing to share a gateway to the other pc's in my lan
>>
>
> That should be possible.
>
> The basic concept is to point the default gateway of all your boxes to
> your linux box and let the linux box decide where to push the traffic
> along.
>
> If you just have two normal DSL lines you will most probably not be
> able to do *real* loadbalancing as your ISP would have to help you.
>
> What you can do is to push different types of connections along the
> two routers, but you have to take care the a connection (e.g. a ssh
> session) is routed along the same path while active.
>
> So you may want to set up two routing tables on your linux box (one
> for each DSL router which becomes default gateway in that table) and
> set up some iptables rules which decide which traffic should be routed
> via which routing table (think: DSL router).
>
> Have a look at
> http://lists.netfilter.org/pipermail/netfilter/2007-June/069142.html
> to get an idea about how to set something like this up (It is not an
> exact example, just a similar one, but the general idea should become
> clear)
>
> HTH
> Ciao
> Max

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