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
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