On Thu, 2008-12-18 at 18:49 +0300, Aleksey Ilyushin wrote:
> Hi Joshua,
>
> I have two observations with similar symptoms:
>
> 1) When MTU on host's interface is less than 1500 it may cause packet
> loss for large packets with sky2 Ethernet driver. Hence web browsing
> fails while DHCP, ARP, ICMP, etc work normally.
>
> 2) My D-link router responds with garbage to ARP requests if it is
> asked for IPv6 and then immediately for IPv4 address, which is
> strangely enough is the case for my Ubuntu Gutsy guest, but not for my
> Ubuntu Hardy host.
>
> Could you check the MTU sizes and get ARP traffic log with tcpdump?
MTU on host is: 1500
eth1 Link encap:Ethernet HWaddr 00:1f:e1:a1:06:cc
inet addr:192.168.1.6 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::21f:e1ff:fea1:6cc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4409958 errors:0 dropped:0 overruns:0 frame:1055650
TX packets:4229461 errors:6 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1845541638 (1.8 GB) TX bytes:571565731 (571.5 MB)
Interrupt:17 Base address:0xc000
Arp traffic while starting up the 3 guest machines (200,201,202). You
can obviously ignore the 1.2 stuff. jd-laptop.local is host:
tcpdump: verbose output suppressed, use -v or -vv for full protocol
decode
listening on eth1, link-type EN10MB (Ethernet), capture size 96 bytes
09:37:27.740750 arp who-has 192.168.1.2 tell 192.168.1.1
09:37:29.376064 arp who-has 192.168.1.2 tell 192.168.1.2
09:37:31.424042 arp who-has 192.168.1.2 tell 192.168.1.2
09:37:33.369656 arp who-has 192.168.1.2 tell 192.168.1.2
09:38:17.224169 arp who-has 192.168.1.1 tell 192.168.1.202
09:38:17.225738 arp reply 192.168.1.1 is-at 00:14:6c:80:28:80 (oui
Unknown)
09:38:17.635383 arp who-has 192.168.1.202 tell jd-laptop.local
09:38:19.455530 arp who-has 192.168.1.1 tell 192.168.1.200
09:38:19.456545 arp reply 192.168.1.1 is-at 00:14:6c:80:28:80 (oui
Unknown)
09:38:19.759430 arp who-has 192.168.1.200 tell jd-laptop.local
09:38:24.343926 arp who-has 192.168.1.1 tell 192.168.1.201
09:38:24.345013 arp reply 192.168.1.1 is-at 00:14:6c:80:28:80 (oui
Unknown)
09:38:24.624388 arp who-has 192.168.1.201 tell jd-laptop.local
09:38:28.054357 arp who-has 192.168.1.2 tell 192.168.1.1
09:38:29.689801 arp who-has 192.168.1.2 tell 192.168.1.2
09:38:29.792307 arp who-has 192.168.1.1 tell 192.168.1.2
09:38:31.635483 arp who-has 192.168.1.2 tell 192.168.1.2
09:38:33.683336 arp who-has 192.168.1.2 tell 192.168.1.2
09:38:48.485370 arp who-has 192.168.1.201 tell 192.168.1.200
09:39:01.266484 arp who-has 192.168.1.1 tell 192.168.1.201
09:39:01.267378 arp reply 192.168.1.1 is-at 00:14:6c:80:28:80 (oui
Unknown)
09:39:05.824368 arp who-has 192.168.1.200 tell jd-laptop.local
Arp traffic while trying to do stuff with guest machines:
ping www.commandprompt.com causes:
09:39:35.791370 arp who-has 192.168.1.201 tell jd-laptop.local
09:39:38.250406 arp who-has 192.168.1.1 tell 192.168.1.201
09:39:38.251095 arp reply 192.168.1.1 is-at 00:14:6c:80:28:80 (oui
Unknown)
09:39:51.812397 arp who-has 192.168.1.200 tell jd-laptop.local
09:40:26.772840 arp who-has 192.168.1.201 tell jd-laptop.local
Routing table of host:
Destination Gateway Genmask Flags MSS Window irtt
Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
eth1
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0
eth1
Routing table of guest 1:
j...@hardy:~$ netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0
eth0
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0
eth0
ifconfig for guest 1:
eth0 Link encap:Ethernet HWaddr 08:00:27:3c:fe:c6
inet addr:192.168.1.200 Bcast:192.168.1.255
Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe3c:fec6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:172097 errors:666 dropped:0 overruns:0 frame:0
TX packets:91164 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15316887 (14.6 MB) TX bytes:24850869 (23.6 MB)
Interrupt:11 Base address:0xc020
Sincerely,
Joshua D. Drake
>
> Aleksey
>
> --
> Aleksey Ilyushin,
> Sun Microsystems
>
> On Dec 17, 2008, at 11:36 PM, Joshua D. Drake wrote:
>
> > On Wed, 2008-12-17 at 12:22 -0800, Larry Riedel wrote:
> >>>> Host: 192.168.1.6
> >>>> Guest: 192.168.1.50
> >>>> Default gw: 192.168.1.1
> >
> >> respond to the ARP requests, or pass them through to
> >> the guest, or if the host is somehow supposed to do
> >> proxy ARP... or maybe this problem has nothing to
> >> do with ARP at all. I presume everything has the
> >> netmask set to /24, so it is not a routing issue.
> >
> > Correct, it is a very simple config... I just set everything on
> > 192.168.1.0/24 to go through 192.168.1.1 .
> >
> > Joshua D. Drake
> >
> >
> >>
> >>
> >> Larry
> >>
> > --
> > PostgreSQL
> > Consulting, Development, Support, Training
> > 503-667-4564 - http://www.commandprompt.com/
> > The PostgreSQL Company, serving since 1997
> >
> >
> > _______________________________________________
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> > [email protected]
> > http://vbox.innotek.de/mailman/listinfo/vbox-users
>
--
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