Re: [LARTC] Loadbalancing the gateway

["Jason A. Pattie" <pattieja@pcxperience.com>]

You actually only have two connections then that Linux can see.  One, 
I'm assuming, is a router that has multiple connections to the ISP which 
it assigns as the same IP address (multi-line ISDN is similar).

You will need to setup your multipath default route like so on the Linux 
box:

If eth0 is assigned 172.16.1.2 on your Linux router, then

ip route add default nexthop via 172.16.1.204 dev eth0 nexthop via 
172.16.1.205 dev eth0

If you want to make one route work more than the other, you can assign 
weights to the routes right after each dev entry in the route statement 
(i.e., "ip route ... dev eth0 weight 2 ... dev eth0 weight 1", this 
would send twice as many connections out the first route as the second 
route).  Remember that if you do not use the 'equalize' modifier to the 
route statement, you get traffic broken up across the links on a per 
session basis.  If using the 'equalize' parameter, it will be broken 
across the links on a per packet basis.

Logu wrote:

>Hi,
>This is my network
>My LAN IP is 172.16.1.0/255.255.255.0
>I have two router which has LAN IP 172.16.1.204 and another one 172.16.1.205
>My Linux machine IP is 172.16.1.1.
>I have two interface for linux machine one is conected to switch where all
>my windows machines are connected and another one 172.16.1.2 is connected to
>hub where my routers are connected
>I set windows machines gateway as 172.16.1.1
>
>Now how should i activate multipath routing
>
>-Logu
>----- Original Message -----
>From: "Jason A. Pattie" <pattieja@pcxperience.com>
>To: "Logu" <apachelog@yahoo.com>
>Cc: "Linux-routing" <lartc@mailman.ds9a.nl>
>Sent: Tuesday, October 09, 2001 8:11 PM
>Subject: Re: [LARTC] Loadbalancing the gateway
>
>
>>You might try multi-path routing.  It doesn't exactly load balance the
>>lines, as in aggregating the bandwidth together, but it does allow N
>>number of simultaneous connections (where N would be the maximum number
>>of different routes you have).
>>
>>In your scenario, let's say you have the 3 routers with IP addresses of
>>1.1.1.1/30, 2.2.2.2/30, and 3.3.3.3/30.  Now, you have your Linux
>>firewall/gateway/router/thingy between the routers and the client.  On
>>your Linux box, you could have 3 separate network cards each connected
>>to one of the routers, or you could have a single network card connected
>>to all three routers via a hub or switch (switch would probably be
>>better).  Let's say you have one network card.  In that scenario, you
>>would assign an IP address in each of the network ranges for the each of
>>the routers.  I.e., 1.1.1.2/30, 2.2.2.3/30, 3.3.3.4/30 (note: these IP
>>address are probably completely incorrect for assignment in the network
>>range I have chosen, just using them as examples; you would get usable
>>IP's from your ISP).  To assign these IP address, use the 'ip' command.
>>
>>ip addr add 1.1.1.2/30 brd + dev eth0
>>ip addr add 2.2.2.3/30 brd + dev eth0
>>ip addr add 3.3.3.4/30 brd + dev eth0
>>
>>Now, you will need to setup the multi-path route as your default route.
>> You can specify the 'equalize' parameter if you like, but I have found
>>that it doesn't do exactly what you might expect it to do.
>>
>>ip route add default nexthop via 1.1.1.1 dev eth0 \
>>                     nexthop via 2.2.2.2 dev eth0 \
>>                     nexthop via 3.3.3.3 dev eth0
>>
>>And that should take care of that.  Now all of this is assuming that you
>>have multiple, different IP ranges for your 3 ISDN lines.  If they are
>>all in the same network range, you can forego having 3 IP's assigned to
>>the same network card on your firewall.  In that case you would only
>>need one.  Then substitue appropriately for the router IP addresses.
>>
>>Logu wrote:
>>
>>>Hi,
>>>I have 3 isdn connections. Is it possible to loadbalace the bandwidth
>>>
>using
>
>>>a linux box in between the routers and the client. I will be very much
>>>greatful to you if someone helps me in this.
>>>
>>>-Logu
>>>
>>>
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>
>>--
>>Jason A. Pattie
>>pattieja@pcxperience.com
>>
>>
>>
>>
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>>
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>
>
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-- 
Jason A. Pattie
pattieja@pcxperience.com




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