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Jure1873
Asked: 2009-07-24 00:15:39 +0800 CST

two gateways / two providers with different ips

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I want to route packets coming in on eth0 back over eth0 and the ones coming in to eth1 back over eth1. I don't care which gateway is used for outgoing connections.

If i just enter two gateways in /etc/network/interfaces then the kernel routes packets out on both interfaces.

I remember it has something to do with routing tables but I don't know how to do it/where can I read more about it.

linux routing iptables gateway

3 Answers

  1. Best Answer

    What you want to achieve is multi-homing, not bonding or load-balancing.

    To do this you'll need to implement what is known as "policy" or "source based" routing.

    Which you can do in Linux by using the iproute2 package.

    There is a good article that explains how to, here.

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  2. I have implemented a working MultiISP setup using shorewall based on this answer: NIC bonding with two uplinks

    It easy to implement and manage, works well in a "load balancing" configuration, where packets are evenly distributed between uplinks if no cached routes are found.

    Read more about it here: http://www.shorewall.net/MultiISP.html

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  3. I found this web page describing exactly how to achieve this using iptables2.

    I found it using google and "linux 2 default gateways"

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