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skoltogyan
21-Nov-2011, 14:46
Server XEN:
Server have this virtual hosts:
xm list
Name ID Mem VCPUs State
Time(s)
Domain-0 0 4295 8 r-----
1314.0
b04winad008 2 1024 1 -b----
279.1
b04winad123 1024 1
28.9
b04winterm06 3 2048 1 -b----
916.6
b04winterm07 7 3584 1 -b----
273.4
esale 5 2048 1
-b---- 54.9
gwmon 6 1024 1 -b----
447.7
oes2l 1 2048 1
-b---- 2029.9

host b04winterm07 have IP addres = 172.16.16.188 ( win2008R2) with
MAC:
b04winterm07.ami.ua (172.16.16.188) at 00:16:3e:88:00:09 [ether] PERM
on br0

My Enviroment:
XEN1 -----SWITCH-----WS(xp).

From thw WS(xp) i do:
ping 172.16.16.188
and... FALSE !!
arp -a and i see:
172.16.16.188 00-15-17-30-6b-36
This is wrong....

In th WS(xp) runing WireShark and see:
Ethernet II, Src: IntelCor_30:6b:36 (00:15:17:30:6b:36), Dst Broadcast
(ff:ff:ff:ff:ff:ff)

Where from this MAC=00:15:17:30:6b:36 ??

Xen Server have 2 NIC:
1) ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:15:17:30:6B:34
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
2) ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:15:17:30:6B:35
UP BROADCAST MULTICAST MTU:1500 Metric:1
and one Bridge:
3) ifconfig br0
br0 Link encap:Ethernet HWaddr 00:15:17:30:6B:34
inet addr:172.16.16.174 Bcast:172.16.255.255
Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1


If "xm shutdown b04winterm07" and on the WS(xp) i do:
Run | cmd
arp -D
ping 172.16.16.188
In the WireShark i see again:
Ethernet II, Src: IntelCor_30:6b:36 (00:15:17:30:6b:36), Dst Broadcast
(ff:ff:ff:ff:ff:ff)

About Xen Server.
xen1:/etc # uname -a
Linux xen1 2.6.27.54-0.2-xen #1 SMP 2010-10-19 18:40:07 +0200 x86_64
x86_64 x86_64 GNU/Linux

Help to find who announces it MAC in the XEN1 server.


Serg


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skoltogyan
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KBOYLE
24-Nov-2011, 22:06
Hi Serg,

Last April in the SLES Networking forum you asked:
'Unknown MAC address. Where from ????? Help me, Please !!'
(http://forums.novell.com/suse/suse-product-discussion-forums/suse-linux-enterprise/suse-linux-enterprise-server-sles/sles-networking/436710-unknown-mac-address-where-help-me-please.html)
Now, in the SLES Virtualization forum you ask:
'Help to find who announces it MAC'
(http://forums.novell.com/forums/suse/suse-product-discussion-forums/suse-linux-enterprise/suse-linux-enterprise-server-sles/sles-virtualization/448491-help-find-who-announces-mac.html)

Sometimes an issue like this requires a lot of troubleshooting to get
the answer and opening a support request with the appropriate vendor may
be the best solution. I find these forums to be most helpful when
someone has already experienced and resolved the same issue as you are
having. Other than that, we can offer a few suggestions that may point
you in the right direction. It would be helpful to know what others have
already suggested but when a new thread is started for the same issue we
sometimes don't get the whole story...

I don't have any specific experience with this issue but here is what I
can offer:


- Can you ping your other DumU's from your Windows XP workstation or
do you have the same problem?
- Can you ping your DomU from another DomU?
- I remember seeing something about switches in one of these forums
but I can't remember where. If I remember correctly, some switches
have issues when multiple IP addresses appear to originate from the
same MAC address as I believe they do when the switch is connected to
a Xen bridge. Have you investigated this possibility with your switch
vendor?


--
Kevin Boyle
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