The Crucial Blog
Xen: Dom0 and DomU can ping, but no other network connectivity – checksum problems
This appears to be a long standing bug with Xen which has not yet been fixed, it has shown its face in a few of our servers recently – but not all. Basically once Xen is installed on Dom0 you are able to ping it, however anything other network services do not work, such as SSH. From what I have read this is due to checksums being done in numerous places, and seems that there is a bug somewhere while this is being done which results in the checksums not matching, and the packets being dropped. The solution to this is to run the following:
ethtool -K eth0 tx off
This same issue arises in the DomUs (Guest) , and the same fix can be used. Its probably a good idea to place in /etc/rc.local on Redhat/Centos/Fedora systems.
Tags: networking, server-administration, vps, xenFiled under: Uncategorized by — aaron @ 11:20 pm
I just have to tell you… this prevented me from jumping off the roof. I was pulling my hair out trying to figure this out and this fix seems to be the answer. So… thanks!
Thanks a bunch for this! I was about to go nuts…
Not a problem! This caused a bit of frustration when we were trying to fix it as well!