[lug] 3 Port Linux router

[Applegate,Kris]

We have an ambitious project that we are working on. We are currently
borrowing a Cisco 7200 from another division in order to do some routing
for one of our setups. We have been trying to build a Linux router that
will take the pace of the Cisco so we can give it back. The hitch is
that the router need to be a 3-port router, that is routing between two
class-c subnets as well as the internet. We are having some troubles
with the routing statements. Here is a run down on the setup:

OS: Redhat 6.2

Network 1 (internet via another private network):
eth0: 172.16.14.4
Subnet: 255.255.0.0
Gateway to Internet: 172.16.1.1
AMD PCI NIC

Network 2 (private)
eth1: 10.0.18.151
Subnet: 255.255.255.0
Intel Dual NIC #1

Network 3 (private)
eth2: 10.0.19.151
Subnet: 255.255.255.0
Intel Dual NIC #2

We have been able to establish routes between all the networks just
fine. However, when we try to hit the internet via eth1 or eth2 we get
no ping back. We can ping other IPs on the respective subnets, just
can't get to the internet. We can however get to the internet on the
actual router box. Here is the routing table from route:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
172.16.14.4     *               255.255.255.255 UH    0      0        0
eth0
10.0.18.151     *               255.255.255.255 UH    0      0        0
eth2
10.0.19.151     *               255.255.255.255 UH    0      0        0
eth1
172.16.0.0      10.0.18.151     255.255.255.0   UG    0      0        0
eth2
172.16.0.0      10.0.19.151     255.255.255.0   UG    0      0        0
eth1
10.0.18.0       10.0.19.151     255.255.255.0   UG    0      0        0
eth1
10.0.18.0       *               255.255.255.0   U     0      0        0
eth2
10.0.19.0       10.0.18.151     255.255.255.0   UG    0      0        0
eth2
10.0.19.0       *               255.255.255.0   U     0      0        0
eth1
default         172.16.1.1      255.255.0.0     UG    0      0        0
eth0
172.16.0.0      172.16.14.4     255.255.0.0     UG    0      0        0
eth0
172.16.0.0      *               255.255.0.0     U     0      0        0
eth0
127.0.0.0       *               255.0.0.0       U     0      0        0
lo


Any help would be greatly appreciated.

--------------------------------------
Kristopher Applegate