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RE: Default Route question when there are two nic cards



Jeff Vian <jvian10 charter net> wrote:

If your system is acting as a gateway router for other systems on your
local network there are different issues involving static routes.  For a
workstation on 2 different networks, only one default gateway can be
used.

This system is also my router. eth0 (as per the annotations) has my public IP address and is my gateway to my ISP. eth1 is the gateway for systems on my LAN. That is, all of the systems on my LAN show a routing table that looks something like:

[dave bend ~]# netstat -n -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 192.168.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 0.0.0.0 192.168.255.254 0.0.0.0 UG 0 0 0 eth1

I point people in this direction because their next question is usually, "How do I get the "other system" onto the internet?" Also, only one default gateway ends up defined in the routing table. The system does the right thing and uses the the default gateway specified for eth0 even though the gateway specified by eth1 comes "later:"

Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface 72.19.169.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 192.168.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 0.0.0.0 72.19.169.1 0.0.0.0 UG 0 0 0 eth0

Cheers,
Dave

--
Politics, n. Strife of interests masquerading as a contest of principles.
-- Ambrose Bierce


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