Theo Band [Xanadu Wireless]
2007-Jan-09 13:55 UTC
[CentOS] Default gateway set incorrectly
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: route add default gw 192.168.101.2 eth1 [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 scholekster 0.0.0.0 UG 0 0 0 eth1 default 192.168.101.1 0.0.0.0 UG 1 0 0 eth1 (scholekster=192.168.101.2) If I issue "service restart network". The added gateway is removed again. I understand that I can fix this default gateway, but that is not what I want. I also tried to manually start dhclient: [root at raaf ~]# dhclient eth1 .... Listening on LPF/eth1/00:15:f2:******** Sending on LPF/eth1/00:15:f2:******** Sending on Socket/fallback DHCPREQUEST on eth1 to 255.255.255.255 port 67 DHCPACK from 192.168.101.2 bound to 192.168.101.221 -- renewal in 294560 seconds. But now my default gateway is added correctly! So is dhclient not used by the networking scripts?? Anyone got an idea of how I could debug this further? The reason I use eth1, is that the machine has two interfaces and is dual bootable. The FC4 installation seems to have a different idea of which adapter should be eth0... Thanks, Theo PS. The error message it started with, for google :-) [root at raaf ~]# yum update Setting up Update Process Setting up repositories http://mirror.centos.org/centos/4/updates/i386/repodata/repomd.xml: [Errno 4] IOError: <urlopen error (113, 'No route to host')>
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. -- During times of universal deceit, telling the truth becomes a revolutionary act. George Orwell