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@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@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@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@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@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@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.
Jim Perrin wrote:
On 1/9/07, Theo Band [Xanadu Wireless] theo.band@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@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
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Jim Perrin -
Theo Band [Xanadu Wireless]