Re: [LARTC] Loadbalancing the gateway

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

Of course, unless the other network knows how to route to the network 
your client resides on, and I'm sure it probably can't.

Logu wrote:

>Hi Jason,
>thanks for your response.
>I am not able to ping outside from client machines.
>I have a doubt. If the client and router is on different network, is it
>necessary to implement NATing.
>
>>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
>>>
>>>>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
>>>>>
>
>
>
>_________________________________________________________
>Do You Yahoo!?
>Get your free @yahoo.com address at http://mail.yahoo.com
>
>
>_______________________________________________
>LARTC mailing list / LARTC@mailman.ds9a.nl
>http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/
>

-- 
Jason A. Pattie
pattieja@pcxperience.com




_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/