[Xen-users] arp who-has packets not seen in Dom0 even by tcpdump

[Литницкий Александр <litnialex@xxxxxxxxxxx>]

Hi all,
I'm running Xen-3.2 and linux-image-2.6.18 as Dom0 kernel on a VT-x 
processor. The problem is that  broadcast arp who-has  packets  are not 
seen in Dom0 kernel. I've tried both precompiled debian kernel and 
compiled latest one from sources as described at 
http://lists.xensource.com/archives/html/xen-users/2008-01/msg00699.html
There is no linux bridge invoked, xend-config has (network-script 
network-dummy)
There is no firewall invoked: iptables -vnL shows nothing, polices are 
ACCEPT. arptables is also empty.
There are no DomU running. ( actually i've tested both hvmloader with 
knoppix liveCD and vanilla  paravit_ops linux-2.24 kernel but it changes 
nothing regarding this issue)
The temporary work-around was to add static arp entry at the router, but 
i really need to get arp-who has working!
Linux-running router  has vlan interface named breeze. I run
"arping 10.5.5.1 -i breeze" and "tcpdump -nn -i breeze port \! 22 -e" shows:
16:31:03.725312 00:16:76:c5:a3:14 > ff:ff:ff:ff:ff:ff, ethertype ARP 
(0x0806), length 42: arp who-has 10.5.5.1 tell 10.5.5.254
16:31:04.729177 00:16:76:c5:a3:14 > ff:ff:ff:ff:ff:ff, ethertype ARP 
(0x0806), length 42: arp who-has 10.5.5.1 tell 10.5.5.254
tcpdump on xen server shows nothing. If i plug the same cable from xen 
server into any other server - i can see those packets. When i boot xen 
server using usual linux kernel (not xenified ) - i see those packets. 
Ethernet card used in xen server is
04:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit 
Ethernet Controller (Copper) (rev 01)
and e1000 driver is used.

In other direction arp is working ok. From Xen server:
breeze:~# tcpdump -nn -i lan1 -e arp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lan1, link-type EN10MB (Ethernet), capture size 96 bytes
16:35:27.082508 00:30:48:62:d3:4a > ff:ff:ff:ff:ff:ff, ethertype ARP 
(0x0806), length 42: arp who-has 10.5.5.254 tell 10.5.5.1
16:35:27.083213 00:16:76:c5:a3:14 > 00:30:48:62:d3:4a, ethertype ARP 
(0x0806), length 60: arp reply 10.5.5.254 is-at 00:16:76:c5:a3:14
Is it a bug in xen or e1000 driver? how can i debug it and what 
additional info can i provide?
Will be thankful for any tips, cause I'm really stuck with this issue 
for about a couple of days. Should i mention that i've already searched 
through all the web?
Best Regards,

--

Litnitchii Alexander
Information Security Engineer
HORS B.V.
http://www.horse21.net



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