Red Hat Bugzilla – Bug 230040
Kernels since 2.6.18-1.2849 break xen nat setup
Last modified: 2007-11-30 17:11:57 EST
Description of problem:
Xen setup using natng not bridging for guests. Works fine on 2.6.18-1.2849 and
previous. Fails completly on all kernels since including the recent
2.6.19-1.2911. Note this only seems to be the fault of the Dom0 - kernels run by
the guests seem not to be relevant.
Version-Release number of selected component (if applicable): 2.6.19-1.2911
Every time - each kernel since 2.6.18-1.2849
Steps to Reproduce:
1. Set up xen machines using nat network NOT standard bridging
2. Install any kernel above 2.6.18-1.2849 on Dom0
3. Start xen guests. Networks will come up but traffic will fail to flow to/from
the machines. Revert Dom0 to 2.6.18-1.2849 or below and it will work without issue.
Xen network nat fails to work - no errors/diagnositics to indicate why
Standard xen nat network setup should continue to work on newer kernels
I have tested this multiple times. At present my setup has Dom0 running
2.6.18-1.2849 and the DomU guests are running 2.6.18-1.2911 and this NAT's just
fine. Upgrade Dom0 to 2.6.18-1.2849 and xen guests start as normal. Everything
appears to be in place. Network traffic however does not flow. No other changes
in terms of xen configuration has been done.
*** This bug has been marked as a duplicate of 230038 ***