[Xen-users] Re: Xen3, dom0=Linux, domU=NetBSD-3.1, ping OK, but no UDP/TCP

["James Youngman" <jay@xxxxxxxxx>]

On 3/11/07, James Youngman <jay@xxxxxxxxx> wrote:
> I am able to ping both ways between the dom0 and domU hosts, but TCP
> does not seem to work.   Packets are getting through:
>
> dom0="orbital"
> domU="scamp"
>
> 1. I can ssh from domU to dom0; the connection shows in netstat on
> dom0 as ESTABLISHED, but the sshd process on the dom0 side hangs
> forever trying to read data.
>
> 2. I can ping both ways between the two machines, however.  I can also
> ping another host on the same Ethernet segment (the router, in fact).
Hmm, it appears to be a checksum problem (incorrect checksum for
packets leaving dom0 and going to domU), but I don't know what to do
about it.  Suggestions?


orbital:~# tcpdump -vv  -i eth0
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
15:18:47.752952 IP (tos 0x0, ttl  64, id 63, offset 0, flags [DF],
proto: TCP (6), length: 64) scamp.65527 > orbital.ssh: S, cksum 0x3aa9
(correct), 1369213480:1369213480(0) win 32768 <mss 1460,nop,wscale
0,sackOK,nop,nop,nop,nop,timestamp 0 0>
15:18:47.753709 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF],
proto: TCP (6), length: 52) orbital.ssh > scamp.65527: S, cksum 0xf518
(correct), 1241685437:1241685437(0) ack 1369213481 win 5840 <mss
1460,nop,nop,sackOK,nop,wscale 7>
15:18:47.753000 IP (tos 0x0, ttl  64, id 64, offset 0, flags [DF],
proto: TCP (6), length: 40) scamp.65527 > orbital.ssh: ., cksum 0xc98e
(correct), 1:1(0) ack 1 win 33580
15:18:47.765901 IP (tos 0x0, ttl  64, id 42119, offset 0, flags [DF],
proto: TCP (6), length: 71) orbital.ssh > scamp.65527: P, cksum 0x9fbe
(incorrect (-> 0x24c5), 1:32(31) ack 1 win 46
15:18:50.764513 IP (tos 0x0, ttl  64, id 42120, offset 0, flags [DF],
proto: TCP (6), length: 71) orbital.ssh > scamp.65527: P, cksum 0x9fbe
(incorrect (-> 0x24c5), 1:32(31) ack 1 win 46
15:18:54.070083 IP (tos 0x0, ttl  64, id 65, offset 0, flags [DF],
proto: TCP (6), length: 40) scamp.65527 > orbital.ssh: F, cksum 0xc98d
(correct), 1:1(0) ack 1 win 33580
15:18:54.071377 IP (tos 0x0, ttl  64, id 42121, offset 0, flags [DF],
proto: TCP (6), length: 40) orbital.ssh > scamp.65527: F, cksum 0x4c6c
(correct), 32:32(0) ack 2 win 46
15:18:54.071899 IP (tos 0x0, ttl  64, id 66, offset 0, flags [DF],
proto: TCP (6), length: 52) scamp.65527 > orbital.ssh: ., cksum 0xc3b5
(correct), 2:2(0) ack 1 win 33580 <nop,nop,sack 1 {32:33}>
15:18:55.544536 IP (tos 0x0, ttl  64, id 3078, offset 0, flags [DF],
proto: TCP (6), length: 71) orbital.ssh > scamp.65528: P, cksum 0x9fbe
(incorrect (-> 0x0741), 1141107199:1141107230(31) ack 2789412035 win
46
15:18:56.764528 IP (tos 0x0, ttl  64, id 42122, offset 0, flags [DF],
proto: TCP (6), length: 71) orbital.ssh > scamp.65527: P, cksum 0x9fbe
(incorrect (-> 0x24c4), 1:32(31) ack 2 win 46

10 packets captured
10 packets received by filter
0 packets dropped by kernel

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