[et-mgmt-tools] Re: ARP failing when I ping from host to guest

[kewlemer]

On Nov 4, 2007 1:37 AM, kewlemer <kewlemer at gmail.com> wrote:
> > 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?
> >

Sorry for the confusion, now on doing tcpdump on guest's eth0, I saw
that the guest receives host's ARP response (for it's 192.168.99.1),
but is NOT receiving the host's ARP requests  ("who-has 192.168.99.128
tell 192.168.99.1").

> I also tried creating new virtual networks with virt-manager as both
> "Isolated virtual network" and "Forwarding to physical network". Each
> time I ping the host's virtual interface which is on the same subnet
> as the guest's eth0, it fails. On doing a tcpdump on host's virtual
> interface(vnet2), I see that the guest's ARP *is* coming through, but
> the host is unable to resolve guest's eth0 IP (192.168.99.128 below).
> Host's virtual IP is 192.168.99.1.
>
> [root at fed-amd64 ~]# tcpdump -i vnet2
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on vnet2, link-type EN10MB (Ethernet), capture size 96 bytes
> 01:24:52.588689 arp who-has 192.168.99.128 tell 192.168.99.1
> 01:24:53.588448 arp who-has 192.168.99.128 tell 192.168.99.1
> 01:24:54.588226 arp who-has 192.168.99.128 tell 192.168.99.1
>
>
This observation is still valid. Looks like I'm missing something
basic. Any pointers?

Thanks,
KM