[Fedora-xen] Re: ARP failing when I ping from host to guest

[kewlemer]

> The problem is that I'm unable to ping from the host to the guest (to
> 192.168.122.195). tcpdump shows that guest is not responding to ARPs
> for 192.168.122.195. Can anyone tell me why?
>
To be more specific, I'm doing a tcpdump on guest's
eth0(192.168.122.195). When the host pings 192.168.122.195, I see
following -

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
12:15:49.058031 arp who-has 192.168.122.195 tell 192.168.122.1
12:15:51.065437 arp who-has 192.168.122.195 tell 192.168.122.1
12:15:52.069123 arp who-has 192.168.122.195 tell 192.168.122.1
12:15:53.071852 arp who-has 192.168.122.195 tell 192.168.122.1
12:15:55.077218 arp who-has 192.168.122.195 tell 192.168.122.1

When the guest's eth0 is receiving ARP for it's right IP address, why
is it not responding?

Here are the routing tables -
HOST-
[root at fed-amd64 ~]# netstat -rn
Kernel IP routing table
Destination        Gateway         Genmask         Flags   MSS Window
irtt Iface
192.168.1.0       0.0.0.0         255.255.255.0   U          0
  0          0 eth0
192.168.122.0   0.0.0.0          255.255.255.0   U          0
0          0 virbr0
0.0.0.0               192.168.1.1     0.0.0.0             UG        0
       0          0 eth0
[root at fed-amd64 ~]#

GUEST-
[root at guest~]# netstat -rn
Kernel IP routing table
Destination      Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.122.0   0.0.0.0         255.255.255.0   U         0         0
        0 virbr0
192.168.122.0   0.0.0.0         255.255.255.0   U         0         0
        0 eth0
169.254.0.0       0.0.0.0         255.255.0.0       U         0
  0          0 eth0
0.0.0.0          192.168.122.1   0.0.0.0              UG      0
   0          0 eth0
[root at guest ~]#

> When I ping from the guest to to 192.168.122.1 and 192.168.122.195,
> both go through. But when I ssh into either of them to make sure I'm
> reaching the host, the ssh lands into the guest itself. This means the
> ping response on the guest is from itself - so the guest is also
> unable to reach the host.
>
Please ignore this. I figured that I have to use host's
eth0(192.168.1.9) to access the host from the guest.


Thanks,
KM