> From: Vineet Mehta [mailto:[EMAIL PROTECTED] > My collegue has a Linux machine which has 2 NIC's on it. What > he did was assign the IP's 192.168.0.6/24 and 192.168.0.7/24 > to the NIC's. And he was trying to ping the network but was > getting errors (i dont know the errors). > > ----------------- > | Switch | > |_________________| > | | > | | > | | > ------------------------------- > | NIC1 NIC2 | > |192.168.0.6/24 192.168.0.7/24| > | Machine | > |-----------------------------| >
> From: Burton M. Strauss III [mailto:[EMAIL PROTECTED] > Now it gets weird if somebody is trying to reach YOU on the > 2nd NIC. Why? Because the routing decision is address based, > not NIC based. > > So a packet TO the address of the 2nd NIC (192.168.0.7) is > received on the 2nd NIC. The reply, addressed say to > 192.168.0.5 again, is sent VIA the 1st NIC (1st match in the > routing rules wins!). Unless the sender also has this kind > of funky routing table. > > THIS is what leads to the 'rule' that you can't have two NICs > with the same network portions, because if they're really NOT > connected identically, you'll lose traffic, and if you're not > really, really careful with routine rules (wait for it) (yes) > you'll lose traffic. > Does this mean, that if both eth0 and eth1 are connected directly to the same switch as in the original post I believe, therefore having the same connection to the network, that it would work? I am wondering as I had a network cable die on one of my servers yesterday, so I am considering sticking a backup Ethernet card in the server, and having it connected into the exactly same switch that the current card/cable connects to. I am just trying to confirm that I have read this right, and that since they are connected to the same connection, that it will work. Hopefully this means that if I lose a cable/card, it will determine that the route isn't working, and move onto the next match? Max. --------------------------------------------------------------------------- ----------------------------------------------------------------------------
