[lug] 3 Port Linux router

[Chip Atkinson]

Is IP forwarding turned on?  Are there any firewalling rules?  Can you 
ping from a machine on 10.0.18 to 10.0.19.x?

Applegate,Kris wrote:

> 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
> 
>  
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