[TriLUG] RH 9.0 routing

[Jon Carnes]

Always suspect Firewalls!

Check to see if your Firewalls are up, if so, drop them for your
testing.  The routing should be setup automagically, but you can check
on it by running:
  netstat - nr

The -r says tell me the routes, the -n says, leave everything as numeric
(no hostnames, please!).  The output will look something like this:

192.168.1.0   0.0.0.0       255.255.255.0   U     0 0      0 eth0
10.2.0.0      0.0.0.0       255.255.0.0     U     0 0      0 eth1
127.0.0.0     0.0.0.0       255.0.0.0       U     0 0      0 lo
0.0.0.0       192.168.1.1   0.0.0.0         UG    0 0      0 eth0



On Mon, 2003-09-08 at 08:58, Greg Brown wrote:
> I have a RH 9.0 machine and I need to set up routing.  I'm working 
> totally from the command line as there is no GUI installed on this box 
> at all.  Here's what I have and what I need:
> 
> I have three 3com ethernet cards.
> 
> eth0 will be connected to my ISP
> eth1 will have a range of 192.168.15.0-254
> eth2 will have a range of 192.168.16.0-254
> 
> Here is my /etc/sysconfig/network
> NETWORKING=yes
> HOSTNAME=babblefish
> GATEWAY=eth0
> GATEWAYDEV=""
> FORWARD_IPV4="yes"
> 
> /etc/sysconfig/network-scripts/ifcfg-eth0 looks like:
> DEVICE="eth0"
> ONBOOT="yes"
> IPADDR=""
> NETMASK=""
> BOOTPROTO="dhcp"
> 
> /etc/sysconfig/network-scripts/ifcfg-eth1 looks like:
> DEVICE="eth0"
> ONBOOT="yes"
> IPADDR=""
> NETMASK=""
> BOOTPROTO="dhcp"
> 
> ...and so on.
> 
> Since I have told this box that it should be forwarding packets and the 
> gateway is eth0 (from /etc/sysconfig/network) one would think this 
> setup would work but it does not.  If I cat 
> /proc/sys/net/ipv4/ip_forward I can see that it is set to 0 (i.e. no 
> routing).  Setting this file to 1 via the echo 1 
>  >/proc/sys/net/ipv4/ip_forward doesn't seem to work either.
> 
> Any ideas?
> 
> Greg