Network unavailable on newly installed NIC

[alanthas]

I have a Redhat 9 machine with three network interfaces, but I can only get 2 of them to pass any traffic. When I originally setup the machine, I only set it up to use 2 interfaces and now I want to add the third. Here is an example of the configuration I am trying to use.

eth0 - public IP
|
|
|------eth1 - DMZ IP (10.x.x.x)
|
|
eth2 - internal IP (172.x.x.x)


The problem arises when I bring up eth2. If I am only using eth0 and eth1 everything is fine, but when I bring up eth2, I receive the message "RTNETLINK answers: Network is unreachable".

At first I thought that it might be a routing problem, but everything looks good there. I also checked the cables and they are good. Here are my routing tables (ip addresses have been substituted) when eth2 is up.

208.248.160.0/24 dev eth0 scope link
10.1.1.0/24 dev eth1 scope link
172.69.0.0/16 dev eth2 scope link
127.0.0.0/8 dev lo scope link
default via 10.1.1.1 dev eth1
default via 172.69.69.1 dev eth2
default via 208.248.160.129 dev eth0

Here are my ethx configs

DEVICE=eth0 - external
ONBOOT=yes
BOOTPROTO=static
IPADDR=208.248.160.254
NETMASK=255.255.255.0
GATEWAY=208.248.160.129

DEVICE=eth1 - DMZ
ONBOOT=yes
BOOTPROTO=static
IPADDR=10.1.1.254
NETMASK=255.255.255.0
GATEWAY=10.1.1.1

DEVICE=eth2 - internal
ONBOOT=yes
BOOTPROTO=static
IPADDR=172.69.69.2
NETMASK=255.255.0.0
GATEWAY=172.69.69.1


Since routing and subnetting is fine, I looked at my IPTABLES configuration. Since I was not concerned about security at this point, I turned it off (service iptables stop/chkconfig iptables off). This did nothing for me. I can ping the ip address assigned to eth2, but I can't ping eth2's gateway. I double and tripple checked all cables to no avail. I have even shutdown the other two interfaces and only had eth2 active. Still the same results.

As an act of desparation I even replaced the NIC card thinking it might be bad. This did not change anything. I really think that I am missing something in the configuration. The other two were configured when I first installed, but I chose not to configure the third interface. Is there something special that needs to be done when adding this third interface?

Oh, I forgot to mention that this box is not a router. It is providing multiple services which each service being bound to only the network that it is intended for.

Thank you for any ideas.

 

[fluid11]

Lets see the output of "route -n" and "ifconfig"...


ChrisP

 

[alanthas]

Here is my ifconfig;

eth0 Link encap:Ethernet HWaddr 00:A0:C9:EB:FD:42
inet addr:xx.xx.xx.254 Bcast:xx.xx.xx.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:49021 errors:0 dropped:0 overruns:0 frame:0
TX packets:35840 errors:0 dropped:0 overruns:0 carrier:0
collisions:78 txqueuelen:100
RX bytes:8558895 (8.1 Mb) TX bytes:3899966 (3.7 Mb)
Interrupt:14 Base address:0xdce0 Memory:f4001000-f4001038

eth1 Link encap:Ethernet HWaddr 00:A0:C9:EB:FD:3A
inet addr:10.x.x.xxx Bcast:10.x.x.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12653 errors:0 dropped:0 overruns:0 frame:0
TX packets:16886 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:1349684 (1.2 Mb) TX bytes:9694680 (9.2 Mb)
Interrupt:11 Base address:0xdcc0 Memory:f4000000-f4000038

eth2 Link encap:Ethernet HWaddr 00:20:78:0F:A2:52
inet addr:172.xx.xxx.2 Bcast:172.xx.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:908 overruns:0 frame:0
TX packets:0 errors:30 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:10 Base address:0x8000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:477 errors:0 dropped:0 overruns:0 frame:0
TX packets:477 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:73004 (71.2 Kb) TX bytes:73004 (71.2 Kb)


Routing tables

Destination Gateway Genmask Flags Metric Ref Use Iface
xx.xx.xx.0 * 255.255.255.0 U 0 0 0 eth0
10.x.x.0 * 255.255.255.0 U 0 0 0 eth1
172.xx.0.0 * 255.255.0.0 U 0 0 0 eth2
169.254.0.0 * 255.255.0.0 U 0 0 0 eth2
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 10.x.x.1 0.0.0.0 UG 0 0 0 eth1 - DMZ
default 172.x.xxx.1 0.0.0.0 UG 0 0 0 eth2 - internal
default xx.xx.xx.129 0.0.0.0 UG 0 0 0 eth0 - external

If I only bring up eth2, I still cannot pass traffice on it. It does not matter which IP set is assigned to it either. Thank you in advance for any suggestions.

 

[fluid11]

Copy and paste the exact output of "route -n". Just change the public IP to something made up (no reason to use x's with private IPs). You can't have 3 default gateways, or else it wouldn't be a default gateway.

ChrisP