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Re: [Xen-users] Re: [Xen-devel] xen 4.1.2* dhcp issue/bug when installing/booting HVM domU domains (CentOS 6, unbuntu 11.04 server). Debian/OpenSolaris work fine.

Am 16.08.2011 00:23, schrieb Pasi Kärkkäinen:

On Mon, Aug 15, 2011 at 11:58:24PM +0200, Mark Schneider wrote:



     Pings from *centos-hvm* to default gateway *no ip-traffic on peth0*



So here's your problem. Your bridge in dom0 is NOT forwarding the packets out 
to peth0..




     root@xen411dom0:/ftp/HVM# tcpdump  -i eth0 'icmp[icmptype] = icmp-echo and
     icmp[icmptype] != icmp-echoreply'
     tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
     listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
     19:54:00.770442 IP 192.168.1.180>   192.168.1.1: ICMP echo request, id 518,
     seq 23, length 64
     19:54:01.770958 IP 192.168.1.180>   192.168.1.1: ICMP echo request, id 518,
     seq 24, length 64


So where are these packets going to ? They're not getting out of dom0..

Do you have a firewall rule in dom0 that drops them?

Try these:
- In the HVM guest: run "arp -an" and check what MAC address you see for the 
gateway-IP.
- In dom0: run "brctl showmacs eth0" and verify which port has the MAC of the 
gateway.


[root@centoshvm ~]# arp -an
? (192.168.1.102) auf 00:1c:25:7e:fb:b7 [ether] auf eth0
? (192.168.1.124) auf b4:99:ba:c1:27:36 [ether] auf eth0


So the HVM guest has NOT received a MAC address for the gateway..
so ARP requests are not working from the HVM guest.

Do this:
- Shutdown the VM.
- Start the VM.
- Run tcpdump in dom0 (tcpdump -i tap<x>  -nn)
- Try pinging the gateway from the HVM guest.
- Paste the whole tcpdump output here.



root@xen411dom0:~# brctl showmacs eth0
port no mac addr                is local?       ageing timer
   6     00:16:3e:27:17:67       no                 3.22
   3     00:16:3e:27:20:67       no                40.85
   1     00:1c:25:7e:fb:b7       no                 0.00
   1     00:1d:7e:ad:35:a8       no                12.66
   1     b4:99:ba:c1:27:36       yes                0.00
   2     fe:ff:ff:ff:ff:ff       yes                0.00
root@xen411dom0:~# arp -an
? (192.168.1.102) auf 00:1c:25:7e:fb:b7 [ether] auf eth0
? (192.168.1.180) auf 00:16:3e:27:17:67 [ether] auf eth0
? (192.168.1.1) auf 00:1d:7e:ad:35:a8 [ether] auf eth0


Are you running some firewall (iptables or ebtables) in dom0 ?

No. It is plane wheezy with 3.0.1 kernel

# ---
root@xen411dom0:~# tcpdump -i tap9.0 -nn | tee /tmp/tcpdum-tap9.0.txt
tcpdump: WARNING: tap9.0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap9.0, link-type EN10MB (Ethernet), capture size 65535 bytes
22:51:32.525644 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 1, length 64 22:51:33.526662 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 2, length 64 22:51:34.526849 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 3, length 64 22:51:35.527052 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 4, length 64 22:51:36.527114 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 5, length 64 22:51:37.527233 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 6, length 64 22:51:38.527325 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 7, length 64 22:51:39.527707 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 8, length 64 22:51:40.527521 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 9, length 64 22:51:41.527674 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 10, length 64 22:51:42.527765 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 11, length 64 22:51:43.527769 ARP, Request who-has 192.168.1.1 tell 192.168.1.180, length 28 
22:51:43.527926 ARP, Reply 192.168.1.1 is-at 00:1d:7e:ad:35:a8, length 46
22:51:43.528599 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 12, length 64 22:51:44.529009 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 13, length 64 22:51:45.529137 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 14, length 64 22:51:46.529284 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 15, length 64 
22:51:47.192618 IP 0.0.0.0 > 224.0.0.1: igmp query v2
22:51:47.192651 IP6 fe80::b699:baff:fec1:2736 > ff02::1: HBH ICMP6, multicast listener querymax resp delay: 1000 addr: ::, length 24 22:51:47.324329 IP6 fe80::216:3eff:fe27:1767 > ff02::1:ff27:1767: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff27:1767, length 24 22:51:47.529421 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 16, length 64 22:51:47.886465 IP6 fe80::216:3eff:fe27:1767 > ff02::202: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::202, length 24 22:51:48.529542 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 17, length 64 22:51:49.529741 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 18, length 64 22:51:50.529889 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 19, length 64 22:51:51.529929 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 20, length 64 22:51:52.530056 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 21, length 64 22:51:53.530170 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 22, length 64 22:51:54.530317 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 23, length 64 22:51:55.530413 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 24, length 64 22:51:56.530603 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 25, length 64 22:51:57.530723 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 26, length 64 22:51:58.530814 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 27, length 64 22:51:59.531236 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 28, length 64 22:52:00.531054 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 29, length 64 22:52:01.531158 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 30, length 64 22:52:02.531352 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 31, length 64 22:52:03.531452 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 32, length 64 22:52:04.531551 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 33, length 64 22:52:05.531748 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 34, length 64 22:52:06.531879 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 35, length 64 22:52:07.532014 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 36, length 64 22:52:08.532055 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 37, length 64 22:52:09.534235 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 38, length 64 22:52:10.534336 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 39, length 64 22:52:11.534439 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 40, length 64 22:52:12.534630 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 41, length 64 22:52:13.534748 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 42, length 64 22:52:14.534856 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 43, length 64 22:52:15.535128 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 44, length 64 22:52:16.535098 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 45, length 64 22:52:17.535198 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 46, length 64 22:52:18.535358 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 47, length 64 22:52:19.535564 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 48, length 64 22:52:20.535493 ARP, Request who-has 192.168.1.1 tell 192.168.1.180, length 28 
22:52:20.535663 ARP, Reply 192.168.1.1 is-at 00:1d:7e:ad:35:a8, length 46
22:52:20.536094 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 49, length 64 22:52:21.536726 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 50, length 64 22:52:22.536845 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 51, length 64 22:52:23.536974 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 52, length 64 22:52:24.537096 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 53, length 64 22:52:25.537279 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 54, length 64 22:52:26.537372 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 55, length 64 22:52:27.537537 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 56, length 64 22:52:28.537658 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 57, length 64 22:52:29.537692 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 58, length 64 22:52:30.537889 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 59, length 64 22:52:31.538022 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 60, length 64 22:52:32.538082 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 61, length 64 22:52:33.538246 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 62, length 64 22:52:34.538365 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 63, length 64 22:52:35.538521 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 64, length 64 22:52:36.538622 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 65, length 64 22:52:37.538719 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 66, length 64 22:52:38.538942 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 67, length 64 22:52:39.538996 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 68, length 64 22:52:40.539144 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 69, length 64 22:52:41.539280 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 70, length 64 22:52:42.539463 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 71, length 64 22:52:43.539786 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 72, length 64 22:52:44.539640 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 73, length 64 22:52:45.539771 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 74, length 64 22:52:46.540000 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 75, length 64 22:52:47.540049 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 76, length 64 22:52:47.975050 IP6 fe80::216:3eff:fe27:2067 > ff02::1: ICMP6, neighbor advertisement, tgt is fe80::216:3eff:fe27:2067, length 32 22:52:48.540271 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 77, length 64 22:52:49.542286 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 78, length 64 22:52:50.542428 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 79, length 64 22:52:51.542559 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 80, length 64 22:52:52.542671 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 81, length 64 22:52:53.542796 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 82, length 64 22:52:54.504716 IP6 fe80::216:3eff:fe27:2067.546 > ff02::1:2.547: dhcp6 solicit 22:52:54.542960 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 83, length 64 22:52:55.543103 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 84, length 64 22:52:56.543129 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 85, length 64 22:52:57.543313 ARP, Request who-has 192.168.1.1 tell 192.168.1.180, length 28 
22:52:57.543462 ARP, Reply 192.168.1.1 is-at 00:1d:7e:ad:35:a8, length 46
22:52:57.543808 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 86, length 64 22:52:58.544471 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 87, length 64 22:52:59.545561 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 88, length 64 22:53:00.545808 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 89, length 64 22:53:01.545789 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 90, length 64 22:53:02.546004 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 91, length 64 22:53:03.546027 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 92, length 64 22:53:04.546249 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 93, length 64 22:53:05.546429 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 94, length 64 22:53:06.546476 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 95, length 64 22:53:07.546621 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 96, length 64 22:53:08.546739 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 97, length 64 22:53:09.546897 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 98, length 64 22:53:10.546976 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 99, length 64 22:53:11.547121 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 100, length 64 22:53:12.547152 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 101, length 64 22:53:13.547338 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 102, length 64 22:53:14.547483 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 103, length 64 22:53:15.547630 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 104, length 64 22:53:16.547774 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 105, length 64 22:53:17.547884 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 106, length 64 22:53:18.548024 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 107, length 64 22:53:19.548104 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 108, length 64 22:53:20.548338 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 109, length 64 22:53:21.548446 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 110, length 64 22:53:22.548440 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 111, length 64 22:53:23.548643 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 112, length 64 22:53:24.548881 IP 192.168.1.180 > 192.168.1.1: ICMP echo request, id 56069, seq 113, length 64 
22:53:52.632691 IP 0.0.0.0 > 224.0.0.1: igmp query v2
22:53:52.632726 IP6 fe80::b699:baff:fec1:2736 > ff02::1: HBH ICMP6, multicast listener querymax resp delay: 1000 addr: ::, length 24 22:53:52.834307 IP6 fe80::216:3eff:fe27:1767 > ff02::1:ff27:1767: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff27:1767, length 24 22:53:53.480335 IP6 fe80::216:3eff:fe27:1767 > ff02::202^C131 packets captured 
131 packets received by filter
0 packets dropped by kernel


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