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Linux Routing Firewall Help please !!

Posted on 2007-04-05
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Last Modified: 2013-12-16
I am trying to configure a firewall with 2 nics.

eth0      Link encap:Ethernet  HWaddr 00:15:E9:FA:43:6E
          inet addr:209.194.80.82  Bcast:209.194.80.87  Mask:255.255.255.248
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6127 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5583 errors:0 dropped:0 overruns:0 carrier:0
          collisions:44 txqueuelen:100
          RX bytes:3368292 (3.2 Mb)  TX bytes:725801 (708.7 Kb)
          Interrupt:11 Base address:0xd000
 
eth1      Link encap:Ethernet  HWaddr 00:04:5A:7A:E4:48
          inet addr:10.1.1.1  Bcast:10.1.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3408 errors:0 dropped:0 overruns:0 frame:0
          TX packets:737 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:334099 (326.2 Kb)  TX bytes:53127 (51.8 Kb)
          Interrupt:10 Base address:0x5c00
 
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:22347 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22347 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1528193 (1.4 Mb)  TX bytes:1528193 (1.4 Mb)


if I disable eth1 then I can access the internet and ping works all the way around. But when I enable eth1 for the internal network I get the following

[root@firewall root]# ping 209.194.80.82
PING 209.194.80.82 (209.194.80.82) 56(84) bytes of data.
64 bytes from 209.194.80.82: icmp_seq=1 ttl=64 time=0.039 ms
 
[root@firewall root]# ping 209.194.80.81
PING 209.194.80.81 (209.194.80.81) 56(84) bytes of data.
64 bytes from 209.194.80.81: icmp_seq=1 ttl=255 time=0.818 ms
 
[root@firewall root]# ping 209.194.80.61
PING 209.194.80.61 (209.194.80.61) 56(84) bytes of data.
From 10.1.1.1 icmp_seq=1 Destination Host Unreachable
 
[root@firewall root]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
209.194.80.80   0.0.0.0         255.255.255.248 U     0      0        0 eth0
10.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         10.1.1.254      0.0.0.0         UG    0      0        0 eth1

According to the documentation I have read this set up should work and I am at a loss for what to do next.
Any idea's?  
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Question by:MarkWP
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cheesygit182 earned 2000 total points
ID: 18861271
"inet addr:10.1.1.1  Bcast:10.1.1.255  Mask:255.255.255.0"
That's your problem. Your usage of the kernels routing tables is perfect, but one of the NICs isn't configured correctly. Test them individually and paste the results of ifconfig here, for each.

~cheesygit182
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by:MarkWP
ID: 18861500
I had a gateway entered on both nics
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