Setting up multiple networking interfaces

[cyrusthevirus]

I'm running into issues when I set up multiple networking interfaces. I have 2 interfaces one a public IP and the other one a private one. I set them up as shown below in the /etc/networking/interfaces.

# The loopback network interface
auto lo
iface lo inet loopback

# The PUBLIC primary network interface
auto eth0
iface eth0 inet static
address 199.x.x.x
netmask 255.255.255.0
gateway 199.x.x.x

# The PRIVATE second network interface
auto eth1
iface eth1 inet static
address 192.168.x.x
netmask 255.255.255.0
gateway 192.168.x.x

The issue is, when both ethernet cables are plugged in, I'm unable to connect to the server through the Public network. When I unplug the second(PRIVATE) network, I'm able to connect. Is there something wrong with my configuration? Thanks.

[Iowan]

Might be an issue with gateway settings - what is shown in route -n - both with and without eth1.

[cyrusthevirus]

here's route -n with eth1:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
199.x.x.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.x.x.0   0.0.0.0         255.255.255.0   U     0      0        0 eth1
0.0.0.0         192.x.x.1   0.0.0.0         UG    100    0        0 eth1
0.0.0.0         199.x.x.1    0.0.0.0         UG    100    0        0 eth0

and without eth1:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
199.x.x.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         199.x.x.1    0.0.0.0         UG    100    0        0 eth0

Thanks again for your help.

Might be an issue with gateway settings - what is shown in route -n - both with and without eth1.

[cyrusthevirus]

Can someone please help me with this?

I'm running into issues when I set up multiple networking interfaces. I have 2 interfaces one a public IP and the other one a private one. I set them up as shown below in the /etc/networking/interfaces.

# The loopback network interface
auto lo
iface lo inet loopback

# The PUBLIC primary network interface
auto eth0
iface eth0 inet static
address 199.x.x.x
netmask 255.255.255.0
gateway 199.x.x.x

# The PRIVATE second network interface
auto eth1
iface eth1 inet static
address 192.168.x.x
netmask 255.255.255.0
gateway 192.168.x.x

The issue is, when both ethernet cables are plugged in, I'm unable to connect to the server through the Public network. When I unplug the second(PRIVATE) network, I'm able to connect. Is there something wrong with my configuration? Thanks.

[Iowan]

Try commenting out the gateway setting for eth1, and restart networking
(sudo /etc/init.d/networking restart)

[cyrusthevirus]

Just wanted to say thanks. Commenting out the second gateway worked.

Try commenting out the gateway setting for eth1, and restart networking
(sudo /etc/init.d/networking restart)