I have 2 NIC's installed and running on my Fedora 3.0 box. Eth0 is running off my cable modem service thru a router. I added the second NIC and it appears as eth1. After the second NIC was added I can no longer get out to the Internet unless I disable eth1. eth1 is connected to my other router that is on my DSL line. I only want eth1 to talk to my internal network not the DSL Internet connection. Is this possible? When both NIC's are activated I can reach each router's config page but Internet doesn't work. I'm sure the computer is confused as to which router to use as the Internet connection. My printer is attached to the DSL network and I want to connect to it in my Fedora box. Any suggestions?

Thanks

First off make sure both NICs are not set to the same subnet. If eth0 is directly connected to the cable modem this should not be the case. Next make sure there is only one default gateway specified, it should be for eth0. Run "route" if there is a default entry for eth1 you should delete it with "route del default gw 'ip-of-eth1-gateway".

Here is my routing table:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.128 U 0 0 0 eth0
192.168.2.0 * 255.255.255.0 U 0 0 0 eth1
169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0

I changed the subnet masks so they are different. I can't ping the eth1 network.

Your subnet masks do not need to be different, just the subnets(networks) themselves. If eth0 is 192.168.1.X/255.255.255.0 and eth1 is 192.168.2.X/255.255.255.0 that would be ok. For some reason you have an APIPA entry (You'll get an ip in the 169.254.X.X range, if your set up to obtain your ip from DHCP, but can't access the DHCP server). I don't know why you have this entry since you have a valid entry for eth1, but this shouldn't stop you from accessing your second network. You can delete this with "route del -net 169.254.0.0 netmask 255.255.0.0 dev eth1", it may make a difference, but I doubt it. Set the subnet masks back as they were, since you could access the web interface of both routers, your configuration should have been correct. Next restart all networking services, better yet reboot, and lets get the output of "ifconfig" and "cat /etc/resolv.conf".

The only way I could excess both router web pages was if I had both gateways setup. I rebooted and removed the 164 entry in the route table. Still timing out when I try and access the eth1 network without a gateway entry.


This resolv.conf is the dns servers for my cable connection.
/etc/resolv.conf:
nameserver 64.78.119.1
nameserver 64.78.119.2
nameserver 64.78.119.2

ifconfig:
eth0 Link encap:Ethernet HWaddr 00:11:2F:7B:82:4B
inet addr:192.168.1.2 Bcast:192.168.1.127 Mask:255.255.255.128
inet6 addr: fe80::211:2fff:fe7b:824b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:283 errors:0 dropped:0 overruns:0 frame:0
TX packets:321 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:141112 (137.8 KiB) TX bytes:31464 (30.7 KiB)
Interrupt:11 Base address:0x4000


eth1 Link encap:Ethernet HWaddr 00:50:04:7C:64:A5
inet addr:192.168.2.9 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::250:4ff:fe7c:64a5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:618 (618.0 b)
Interrupt:10 Base address:0xc000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2183 errors:0 dropped:0 overruns:0 frame:0
TX packets:2183 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2080730 (1.9 MiB) TX bytes:2080730 (1.9 MiB)

New route table:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 * 255.255.255.128 U 0 0 0 eth0
192.168.2.0 * 255.255.255.0 U 0 0 0 eth1
default 192.168.1.1 0.0.0.0 UG 0 0 0 eth0

Thanks for your help twsnnva. It was something as simple as my firewall. It was blocking the eth1 traffic until I configured it as a trusted host. Now I can ping all the eth1 machines and printing works.

How did you allow traffic through your firewall for ETH1, did you use the GUI or iptables? Could you please provide an example, thanks in!