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[Xen-devel] Networking problem in guest domains

  • To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: David F Barrera <dfbp@xxxxxxxxxx>
  • Date: Wed, 01 Feb 2006 12:01:21 -0600
  • Delivery-date: Wed, 01 Feb 2006 18:11:18 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Starting with changesets 8707 in my daily testing, I've been unable to
access guest domains via SSH or telnet. 


When I access the guest domains via 'xm console', I am able to
ascertain that networking is up on them; I ping external machines, mount NFS
share, etc. However, I cannot ssh into them from external machines, or even 
from dom0.

This is happening on all machines, SLES 9 SP2, RHEL 4, and FC3/4 based machines,
both x86 and x86_64.

Trying to SSH into guest domain from external machine:

dyn95341161:~ # ssh lamb5-vm1

No response or comeback from login.

Guest domains accessed via 'xm console'. You can see NFS mount and ping 
lamb5-vm1:~ # df -T
Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/sda6     ext3    19307400   3155892  15170744  18% /
tmpfs        tmpfs      114024         0    114024   0% /dev/shm
devpts      devpts    19307400   3155892  15170744  18% /dev/pts
               nfs   206429688  80941920 115001656  42% /skyline
lamb5-vm1:~ # ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=63 time=0.452 ms
64 bytes from icmp_seq=2 ttl=63 time=1.15 ms

All services are up on the guest domains. I tried to telnet into the guest 
domain, and the following
message displays:

[root@thinkcentre-dom0 xen-unstable.hg]# telnet
Connected to thinkcentre-domU-009053041223.austin.ibm.com (
Escape character is '^]'.
telnetd: All network ports in use.
Connection closed by foreign host.

Has anyone else seen this problem? 

David F Barrera
Linux Technology Center
Systems and Technology Group, IBM

"The wisest men follow their own direction. "

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