On Tue, 2005-02-15 at 08:35, David Benigni wrote: > Here is the dump from ip route list for various modes of the nics. > (personally I prefer the netstat -rn output, I guess that makes me old school. :) ) > eth0 up and eth1 down (normal boot): > 10.1.0.0/16 dev eth0 scope link > 127.0.0.0/8 dev lo scope link > default via 10.x.y.1 dev eth0 > That looks fine, single interface eth0 used. > eth0 up and eth1 up (via ifup eth1): > 10.1.0.0/16 dev eth1 scope link > 10.1.0.0/16 dev eth1 proto kernel scope link src 10.x.y.121 > 127.0.0.0/8 dev lo scope link > default via 10.x.y.1 dev eth1 > Note that the default route has switched to the eth1 interface. Actually it looks like all the routes are using eth1. What happened to eth0? It really looks like you would have zero traffic going out over the eth0 interface in this configuration. You should be able to look at the ifconfig information to get the stats in this setup. You may see received data but I doubt you would see much if any transmit data on eth0. > eth0 up and eth1 down (via ifdown eth1): > 127.0.0.0/8 dev lo scope link > Would expect this result since everything was routing out the eth1 interface. So this result makes sense and appears to be correct. > eth0 up and eth1 down(via /etc/init.d/network restart): > 10.1.0.0/16 dev eth0 scope link > 127.0.0.0/8 dev lo scope link > default via 10.x.y.1 dev eth0 > Back to square one. At this point the problem is not at the point you shutdown eth1. It is when you bring eth1 up and all your routes get pushed out that interface. It is that point that the system must be looking at the addressing you are using and says the new interface has the same subnet as the old one so all traffic can go this way. Depending on the actual IP address on the interface it may decide that based on the highest or lowest IP address. Not sure about that but that appears to be what is happening. So if you think this has been working with the two interfaces splitting traffic, it probably has not. Look at the packet stats ifconfig gives you for each interface. Setup some file transfers or something to each IP address for testing. I suspect you will see all outbound traffic on eth1 and nothing on eth0, even for local LAN traffic. -- Scot L. Harris webid@xxxxxxxxxx The typewriting machine, when played with expression, is no more annoying than the piano when played by a sister or near relation. -- Oscar Wilde
