[ale] TCP/IP routing on RHEL3 ES

[Jerry Yu]

you may want to check ifcfg-eth? to see whether they have GATEWAY=
specified. I've seen 'network' init script got confused (from where I stand)
about which gw to use as default route, when GATEWAY= is speficied in
multiple ifcfg-eth? files.

On 1/31/06, Ryan Fish <FishR at bellsouth.net> wrote:
>
>  I recently had to move a public IP address from one web server to another
> in the same farm.  Upon doing this I have experienced routing issues that
> I've been able to "fix" by manually adding the correct default gateways on
> each box.  However, these entries will not remain in place after a reboot
> (as per normal) but I am unable to get traffic to route properly on either
> box if I add the proper gateway information to /etc/sysconfig/network.
>
>
>
> Box A
>
>
>
> Now only on 192.168.3.X network, Class C, GW 192.168.3.1
>
> Formerly on 209.168.X.X network, Class C, GW 209.168.X.X
>
>
>
> Without using "route add default gw 192.168.3.1 eth0" no GW is shown in
> the routing table however the traffic does appear to route properly.  Why?
>
>
>
> Unfortunately I have lost access to this box at this time as I made a
> change (set GW to 192.168.3.1 in /etc/sysconfig/network) and restarted the
> network (service network restart).  I will have to head out to the DC to
> change things back soon?
>
>
>
>
> ------------------------------------------------------------------------------------------------
>
>
>
> Box B
>
>
>
> 192.168.3.X network, Class C
>
> Now also has 209.168.X.X, Class C, GW 209.168.X.X
>
>
>
> I had to manually to do the following to get this box to route right after
> moving the public IP to it:
>
>
>
> ip route del default via 192.168.3.1 dev eth0
>
> route add default gw 209.168.X.X eth1
>
>
>
> /etc/sysconfig/network still shows 192.168.3.1 as the gateway
>
>
>
>
>
> What am I missing and/or doing wrong here?  I've re-IP'd these boxes
> before without this type of trouble?  My online searches haven't come up
> with much useful info either.
>
>
>
> Hopefully what I just typed above makes some sort of sense.
>
>
>
> Thank you in advance!
>
>
>
> -Ryan
>
>
>
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>
>
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