How to configure Ubuntu using 2 NICs?

[new2linux2]

Hi All

I am very green on the Linux stuffs.

I have 2 NICs in my PC and I am trying to setup the following:

INCOMING ---------------------------------------------OUTGOING
[PC1 say IP 192.168.1.5]----> [PC2 eth0] and forward to [PC 2 eth1] ----> [PC3].

Meaning that [PC2 eth0] received traffic from [PC1 IP 192.168.1.5] and forward the traffic out to [PC2 eth1] to [PC3]



Is this possible ? If so, how do I do this.

Thanks in advance.

[id10t]

Yup. First you'll want to play with the udev persistent rules for net devices and make sure eth0 stays eth0 (done via MAC address) and eth1 stays eth1.

Then you'll need to enable IP forwarding.

Then you'll need to probably set up a firewall, etc.

[new2linux2]

Thanks id10t,

I checked the "/ect/udev/rules.d/persistent-net.lues, the MAC addresses are corresponded to the proper eth.

To enable the IP forwording, do I do it under the "/etc/init.d/iptables.sh" ?

How do you setup the firewall under Ubuntu?


Many thanks for your help.

[falko]

Originally Posted by new2linux2

To enable the IP forwording, do I do it under the "/etc/init.d/iptables.sh" ?

Open /etc/sysctl.conf and add the line

net.ipv4.ip_forward=1

Then run

sysctl -p