Hello,
I'm following instructions in http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-DR.html#route_on_... to allow my xen guest real hosts to serve virtual IP's behind LVS without having to allocate real public IP addresses for each such xen guest.
I have eth1 connected via a "back-end" switch to the eth1/xenbr1 of the xen host and the other physical servers, this is the interface that is used by LVS to switch packets over to the real servers.
I managed to manually do:
# ip route add to <default-router> dev eth0 # ip route add via <default-router>
and before that, in order to allow outgoing packets to be sent via eth0, I did: # ifconfig eth0 0.0.0.0 up
and it works great, but when I try to configure this permanently via ifcfg-eth0 it says:
Bringing up interface eth0: connect: Invalid argument [ OK ]
Things seem to work OK - the server can serve over the Virtual IP, eth0 doesn't have an IP associated with it etc. But I'm worried about this message.
Some relevant config files: ifcfg-eth0:
To setup the routes, I followed http://www.centos.org/docs/5/html/5.2/Deployment_Guide/s1-networkscripts-sta... and http://www.mail-archive.com/centos@centos.org/msg15253.html and put the following in /etc/sysconfig/network-scripts/route-eth0: DEVICE=eth0 ONBOOT=yes TYPE=Ethernet IPADDR=0.0.0.0 NETMASK=0.0.0.0
route-eth0: to <router-address> dev eth0 via <router-address>
output of "ifconfig eth0": eth0 Link encap:Ethernet HWaddr 00:16:3E:19:E6:97 inet6 addr: fe80::216:3eff:fe19:e697/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2012 errors:0 dropped:0 overruns:0 frame:0 TX packets:250 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:174268 (170.1 KiB) TX bytes:47731 (46.6 KiB)
So - did I do this correctly and what should I do to fix the error message?
Thanks,
--Amos
Hi,
On Tue, Nov 11, 2008 at 00:11, Amos Shapira amos.shapira@gmail.com wrote:
and it works great, but when I try to configure this permanently via ifcfg-eth0 it says: Bringing up interface eth0: connect: Invalid argument [ OK ]
ifcfg-eth0: DEVICE=eth0 ONBOOT=yes TYPE=Ethernet IPADDR=0.0.0.0 NETMASK=0.0.0.0
Try this in ifcfg-eth0:
DEVICE=eth0 ONBOOT=yes TYPE=Ethernet IPADDR=
Yes, that's an empty IPADDR variable, that is how you should configure it if you want the interface up but without an IP address. You should also omit the netmask since it does not make any sense.
By the way, the error you have "connect: Invalid argument" is because ifup-eth uses arping to broadcast the new IP address to the local network, but as the interface really has no IP arping will not be able to send this information and will give you this error. Setting an empty IPADDR variable makes ifup-eth realise that although the interface is up, it should have no IP address.
HTH, Filipe
2008/11/11 Filipe Brandenburger filbranden@gmail.com:
Try this in ifcfg-eth0:
DEVICE=eth0 ONBOOT=yes TYPE=Ethernet IPADDR=
Yes, that's an empty IPADDR variable, that is how you should configure
Hi Filipe,
It worked on the test server but on other servers were we tried it, it turned out that they require IPADDR=0.0.0.0 to make it work.
I'm not sure what causes the difference yet (they are all up to date CentOS 5.2) but just wanted to thank you for the tip, it allowed us to close this issue for now.
Cheers,
--Amos
-
Amos Shapira -
Filipe Brandenburger