Xen users - Jul 2009 - Cannot ping 192.168.0.21, everything else works

Hi,

	I''ve tried to figure this one out for the past few days, but I just 
can''t.  The problem is rather simple, everything works fine, but I
can''t
ping this specific IP address (192.168.0.21), from Dom0 or DomUs.  This 
IP address is an HP printer (JetDirect card)



   Here are the details:

-Using xen-3.0.3-80.el5_3.3 on RHEL5
-eth0 is linked to xenbr0
-eth1 is linked to xenbr1 (which has 192.168.0.171)
-iptables -L shows nothing (I disabled it)
-ip6tables -L shows nothing (I disabled it)
-route shows correct route from 192.168.0.0 255.255.255.0 -> eth1
-arping -I eth1 192.168.0.21 shows the mac address and a response time 
-around 1 ms
-One of the DomU is my nagios server, and I can monitor all the service 
I want, except a service on 192.168.0.21
-I cannot access any service on this IP (port 21, 80, 280, 443, 515, 631 
and 9100 shows as open when nmapped from a different computer)
-There is no firewall between my Xen host and the HP printer

Any help would be appreciated.

Regards,

Ugo


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Hi,

Try pinging 192.168.0.21 from within domU and do a "tcpdump -nn -i
eth1"
in dom0. See if any ARP request show up. If not, try a tcpdump within
domU and watch for ARP requests.

Cheers,

Radu


On Mon, 2009-07-06 at 15:47 -0400, Ugo Bellavance wrote:
> Hi,
> 
> 	I''ve tried to figure this one out for the past few days, but I
just
> can''t.  The problem is rather simple, everything works fine, but I
can''t
> ping this specific IP address (192.168.0.21), from Dom0 or DomUs.  This 
> IP address is an HP printer (JetDirect card)
> 
> 
> 
>    Here are the details:
> 
> -Using xen-3.0.3-80.el5_3.3 on RHEL5
> -eth0 is linked to xenbr0
> -eth1 is linked to xenbr1 (which has 192.168.0.171)
> -iptables -L shows nothing (I disabled it)
> -ip6tables -L shows nothing (I disabled it)
> -route shows correct route from 192.168.0.0 255.255.255.0 -> eth1
> -arping -I eth1 192.168.0.21 shows the mac address and a response time 
> -around 1 ms
> -One of the DomU is my nagios server, and I can monitor all the service 
> I want, except a service on 192.168.0.21
> -I cannot access any service on this IP (port 21, 80, 280, 443, 515, 631 
> and 9100 shows as open when nmapped from a different computer)
> -There is no firewall between my Xen host and the HP printer
> 
> Any help would be appreciated.
> 
> Regards,
> 
> Ugo
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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Radu Rendec wrote:
> Hi,
> 
> Try pinging 192.168.0.21 from within domU and do a "tcpdump -nn -i
eth1"
> in dom0. See if any ARP request show up. If not, try a tcpdump within
> domU and watch for ARP requests.
I may try that tomorrow, but the problem is that I can''t ping this IP 
address from Dom0 either...  but arping works OK on Dom0.

Thanks,

Ugo


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Radu Rendec a écrit :
> Hi,
> 
> Try pinging 192.168.0.21 from within domU and do a "tcpdump -nn -i
eth1"
> in dom0. See if any ARP request show up. If not, try a tcpdump within
> domU and watch for ARP requests.
My bad... Beginner''s mistake.  Bad subnet mask on the printer.  Sorry 
for the noise.

Ugo


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