> 
> 
> Not sure about the Network unreachable but I do not think you need a gw
> on the router since the route is already attached to the network.  THe
> gateway is to tell a machine ," since you don;t know anything about this
> network, here is where to send these packets.
> 

right, but i still need the default route pointing to the outside across 
my 4 block to my upstream, correct?

> 
>>However if I do it as I have seen described in some howtow's:
>>route add -net 10.1.5.0 netmask 255.255.255.224 gw 10.1.1.2
>>
>>route does not complain, but i cannot ping eth0 from eth1 or vice versa
>>with a destination host unreachable!
> 
> 
> you have told the machine to send packets destined for 10.1.5.0 to
> 10.1.1.2 and since it is the same machine, it just loops. or pukes I
> guess.
> 
>>I guess my question is: Am I over-complexifying this? With forwarding
>>enabled, and the proper subnets defined on each interface, will the kernel
>>just say "oh, yeah that network is on eth0 or that network is on eth1" and
>>pass it on? 
> 
> 
> Yep.  Your original routing table looks ok to me but then I have never
> done the aliasing thing so I don't know what the eth1:0 should look
> like.
> 
> I would probably try it with eth0 and eth1 first and then bring up
> eth1:0 after I got it working but I am a break a problem into chunks
> kind of guy. 
> 

that makes sense, and if I run into problems I'll try pearing down the 
secondary interfaces to narrow the scope of "what's wrong"

> 
> What happens with just the two interfaces up?
> 

same thing, can't ping eth1 from eth0 or vice-versa

> also make sure that forwarding is turned on via /etc/sysctrl.conf
> this line needs to read :
> net.ipv4.ip_forward = 1
> 

i have that enabled in /etc/sysconfig/network and 
/proc/sys/net/ipv4/ip_forward is 1. (after a reboot).. do i need to 
specify it in sysctrl.conf as well??

> 
> Also are there any firewall rules in the way?
> 

none.

> HTH
> 
> Bret
> 
> 
> 

-- 
Matthew Boeckman                        (816) 777-2160
Manager - Systems Integration           Saepio Technologies



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