Red Hat Bugzilla – Bug 737359
vm guest lost internet connection - the host still have it
Last modified: 2013-01-09 19:18:22 EST
Description of problem:
Sometimes all my guest vm´s got lost there internet connections comletely. The host (fedora15) still has it.
Version-Release number of selected component (if applicable):
[user@localhost ~]$ rpm -qa | grep kvm
[user@localhost ~]$ rpm -qa | grep qemu
[user@localhost ~]$ rpm -qa | grep kernel
Steps to Reproduce:
1.have some vm´s running under kvm fedora15
2.see breaking the internaet connections of all guests(more or less at the same time)
3.see that the host has still internet connection.
Breaking internet connections for the guests
Stable internet connections for the guests.
Created attachment 522608 [details]
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
From your logs, it looks like you are using libvirt's default virtual network. This mode relies on non persistent iptables rules added when libvirtd is started. The problem is likely that iptables was restarted, or another tool like system-config-firewall made changes to iptables that wiped out libvirt networking rules. This is a long known issue unfortunately :(
Work has already started for F18 timeframe to have libvirtd work with firewalld to store these rules in some persistent manner, effectively fixing this issue. But it won't ever make F15 (which is end-of-life in a month).
That said, I'm just assuming that's the issue you were hitting :) If you think I missed something and you are still encountering this on F16 or later, please reopen this report.