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.
172.16.1.205You 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
allMy Linux machine IP is 172.16.1.1. I have two interface for linux machine one is conected to switch where
tomy windows machines are connected and another one 172.16.1.2 is connected
hub where my routers are connected I set windows machines gateway as 172.16.1.1
Now how should i activate multipath routing
-Logu
usingYou 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
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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