[CentOS] Default gateway set incorrectly

Tue Jan 9 14:57:46 UTC 2007
Theo Band [Xanadu Wireless] <theo.band at xanadu-wireless.com>

Jim Perrin wrote:
> On 1/9/07, Theo Band [Xanadu Wireless] <theo.band at xanadu-wireless.com> 
> wrote:
>> I try to setup networking with a fresh CENTOS4.4 installation. Upto now
>> I have 20 installations, most of them FC3/FC4 and RHEL3.
>> I noticed that the default gateway is not setup properly when using 
>> Centos.
>>
>> [root at raaf ~]# route
>> Kernel IP routing table
>> Destination Gateway Genmask Flags Metric Ref Use
>> Iface
>> 192.168.101.0 * 255.255.255.0 U 0 0 0 eth1
>> 169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
>> default 192.168.101.1 0.0.0.0 UG 1 0 0 eth1
>>
>> Networking is setup done by using dhcp, and this seems to work OK.
>> Problem is however that the gateway should be 192.168.101.2 and not
>> 192.168.101.1 (does not exist). If I manually add the gateway,
>> networking is OK:
>
> Sounds like you need to fix your dhcp server so that it hands out the
> proper information.
>
>
Thanks Jim. That triggered the right thing. I had two servers specified 
in my dhcpd configuration:

option routers 192.168.101.2, 192.168.101.1;

> option routers ip-address [, ip-address... ];
>
> The routers option specifies a list of IP addresses for routers on
> the client’s subnet. Routers should be listed in order of prefer-
> ence.

All my other Windows and Linux boxes up to now don't seem to mind. I 
checked the routing on other boxes and they show up with both gateways 
(the old gateway was replaced a year ago..).

Again thanks, you pointed me to the right spot.

Theo