On Thu, 2006-10-12 at 08:28 -0600, David G. Miller wrote: > John Austin <ja@xxxxxxxxxx> wrote: > > >>I point people in this direction because their next question is usually, > >>> "How do I get the "other system" onto the internet?" Also, only one > >>> default gateway ends up defined in the routing table. The system does > >>> the right thing and uses the the default gateway specified for eth0 even > >>> though the gateway specified by eth1 comes "later:" > >>> > >>> Kernel IP routing table > >>> Destination Gateway Genmask Flags MSS Window irtt > >>> Iface > >>> 72.19.169.0 0.0.0.0 255.255.255.0 U 0 0 0 > >>> eth0 > >>> 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 > >>> eth1 > >>> 192.168.0.0 0.0.0.0 255.255.0.0 U 0 0 0 > >>> eth1 > >>> 0.0.0.0 72.19.169.1 0.0.0.0 UG 0 0 0 > >>> eth0 > > > >There is no gateway shown associated with eth1 !? > > > >So no notice has been taken of the GATEWAY=72.19.169.230 > >in /etc/sysconfig/network-scripts/ifcfg-eth1 > > > >I cannot see that this entry achieves anything > > > >John > > > There is a difference between a "gateway" and a route. 192.168.0.0/16 > through eth1 does not need a gateway since all addresses on that subnet > are directly accessible. Likewise, the 72.19.169.0/24 subnet is > directly accessible through eth0. The default route shows up as a > gateway since addresses other than some subnet of 72.19.169.0/24 are > indirectly accessible (traffic has to go through other routers). I ran > across the following which puts all this a little more succinctly: > > > Gateways are a type of router. /Routers/ connect two or more networks > > and provide the routing function. Some routers, for example, route at > > the network interface level or at the physical level. /Gateways/, > > however, route at the network level. > > My approach may not work if I had multiple gateways or a more complex > network. I don't and it works quite well. I think I originally came up > with this approach after reading the O'Reilley book "Linux Network > Administration" probably when I was running RHL-5 or RHL-6.X. > > Cheers, > Dave > > -- > Politics, n. Strife of interests masquerading as a contest of principles. > -- Ambrose Bierce > Hi Dave I agree with everything you say !!!!!!! I am just not convinced that a GATEWAY statement in ifcfg-eth1 is necessary to achieve the required route table. Cheers John
