Re: [LARTC] Loadbalancing the gateway

["Logu" <apachelog@yahoo.com>]

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
> >>>



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