On Wed, Feb 23, 2011 at 03:38:08PM +0300, Otandeka Simon Peter wrote:
> Richard,
> 
> First of all have one default gateway.  Usually the public IPs default gw is
> used. So your public IPs should use that.
> For your private IP, you may need to specifically set a route in your table
> to channel traffic through the gateway specified something like
> "route add -net 172.16.0.0  gw 172.16.0.1 eth3".
> I am not on my suse box to test it out but I think it is written like that.

You need a range of IPs to specify a network.

route add -net 172.16.0.0/16 gw 172.16.0.1 eth3

The problem is that eth3 is already configured with a 255.255.0.0
netmask, so that doesn't make any sense.

Here is a little networking theory.  There are two kinds of IP addresses
ones which are reachable directly and ones which need a gateway.  Known
and unknown in other words.  IP address cannot be both known and
unknown.

In this case 172.16.0.1 is known.  That's a gateway and we don't need a
gateway to reach the gateway.  In fact with a netmask of 255.255.0.0 all
the addresses which start with 172.16. are known and do not need a
gateway.

If your internal network is really set up to need a gateway (ie all the
addresses are unknown except the gateway), and I totally don't believe
it is then you'd have to configure it like this:

ifconfig eth3 172.16.0.10 netmask 255.255.255.255
route add -host 172.16.0.1 eth3
route add -net 172.16.0.0/16 gw 172.16.0.1 eth3

But that's nonsense.  :P  You don't need a gateway for the internal
network.

regards,
dan carpenter

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