My xen setup is having trouble communicating between dom0 and domu. The dom0
and domUs have no problem communicating outside the physical machine, and the
domUs can even talk to each other with no problems, but dom0-domU comms is a
no-go.
I am running gentoo x86 and xen-3.0.0. The xend network-bridge script didn't
seem to work at all, so I disabled it and use a bridge configured by gentoo
(see dom0 network info below). The domUs use vanilla xend bridge networking
(see dom1 network info below).
Now the dom0 and domU can ping each other, and even establish a tcp connection,
but dom0->domU tcp packets always seem to have a failing checksum. (see tcpdump
trace of a telnet session below)
Any thoughts?
Thanks,
Dan.
#######################################
# dom0 network information
dom0 / # brctl show
bridge name bridge id STP enabled interfaces
br0 8000.005004652f84 no eth0
vif3.0
dom0 / # ip a l dev br0
20: br0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
link/ether 00:50:04:65:2f:84 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.5/24 brd 192.168.1.255 scope global br0
<inet6 stuff omitted>
dom0 / # ip a l dev eth0
19: eth0: <BROADCAST,MULTICAST,PROMISC,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:50:04:65:2f:84 brd ff:ff:ff:ff:ff:ff
inet6 fe80::250:4ff:fe65:2f84/64 scope link
valid_lft forever preferred_lft forever
dom0 / # ip a l vif3.0
23: vif3.0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
inet6 fe80::fcff:ffff:feff:ffff/64 scope link
valid_lft forever preferred_lft forever
dom0 / # ip r l
192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.5
127.0.0.0/8 dev lo scope link
default via 192.168.1.1 dev br0
dom0 / # arp -a
? (192.168.1.6) at 00:16:3E:6C:24:FC [ether] on br0
? (192.168.1.103) at 00:11:D8:5C:01:98 [ether] on br0
? (192.168.1.103) at 00:11:D8:5C:01:98 [ether] on br0
dom0 / # brctl showmacs br0
port no mac addr is local? ageing timer
1 00:11:95:e2:7d:72 no 11.08
1 00:11:d8:5c:01:98 no 0.00
2 00:16:3e:6c:24:fc no 15.33
1 00:20:af:50:15:9c no 8.32
1 00:50:04:65:2f:84 yes 0.00
1 00:90:4b:4b:6d:f6 no 99.14
2 fe:ff:ff:ff:ff:ff yes 0.00
#######################################
# dom1 network information
dom1 / # ip a l eth0
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:16:3e:6c:24:fc brd ff:ff:ff:ff:ff:ff
inet 192.168.1.6/24 brd 192.168.1.255 scope global eth0
<inet6 stuff omitted>
dom1 / # ip r l
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.6
127.0.0.0/8 dev lo scope link
default via 192.168.1.1 dev eth0
dom1 / # arp -a
? (192.168.1.5) at 00:50:04:65:2F:84 [ether] on eth0
? (192.168.1.103) at 00:11:D8:5C:01:98 [ether] on eth0
? (192.168.1.1) at 00:20:AF:50:15:9C [ether] on eth0
#######################################
# tcpdump of domU->dom0 telnet session
#
# Note that tcpdump running in dom0 and dom1 will both show the tcp checksum
errors.
#
dom1 ~ # tcpdump -v -i eth0 port 23
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
17:54:21.182760 IP (tos 0x10, ttl 64, id 48589, offset 0, flags [DF], length: 60)
192.168.1.6.33778 > 192.168.1.5.telnet: S [tcp sum ok] 1720050423:1720050423(0) win
5840 <mss 1460,sackOK,timestamp 1728314 0,nop,wscale 2>
17:54:21.280506 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], length: 60)
192.168.1.5.telnet > 192.168.1.6.33778: S [tcp sum ok] 2896578887:2896578887(0) ack
1720050424 win 5792 <mss 1460,sackOK,timestamp 11502518 1728314,nop,wscale 2>
17:54:21.280528 IP (tos 0x10, ttl 64, id 48591, offset 0, flags [DF], length: 52)
192.168.1.6.33778 > 192.168.1.5.telnet: . [tcp sum ok] ack 1 win 1460
<nop,nop,timestamp 1728315 11502518>
17:54:21.183846 IP (tos 0x10, ttl 64, id 48593, offset 0, flags [DF], length: 76)
192.168.1.6.33778 > 192.168.1.5.telnet: P [tcp sum ok] 1:25(24) ack 1 win 1460
<nop,nop,timestamp 1728315 11502518> [telnet DO SUPPRESS GO AHEAD, WILL TERMINAL
TYPE, WILL NAWS, WILL TSPEED, WILL LFLOW, WILL LINEMODE, WILL NEW-ENVIRON, DO STATUS]
17:54:21.183905 IP (tos 0x10, ttl 64, id 51966, offset 0, flags [DF], length: 52)
192.168.1.5.telnet > 192.168.1.6.33778: . [tcp sum ok] ack 25 win 1448
<nop,nop,timestamp 11502518 1728315>
17:54:21.238656 IP (tos 0x10, ttl 64, id 51968, offset 0, flags [DF], length: 64)
192.168.1.5.telnet > 192.168.1.6.33778: P [bad tcp cksum 838e (->f14)!] 1:13(12) ack
25 win 1448 <nop,nop,timestamp 11502523 1728315> [telnet DO TERMINAL TYPE, DO TSPEED,
DO XDISPLOC, DO NEW-ENVIRON]
17:54:21.439151 IP (tos 0x10, ttl 64, id 51970, offset 0, flags [DF], length: 64)
192.168.1.5.telnet > 192.168.1.6.33778: P [bad tcp cksum 838e (->eff)!] 1:13(12) ack
25 win 1448 <nop,nop,timestamp 11502544 1728315> [telnet DO TERMINAL TYPE, DO TSPEED,
DO XDISPLOC, DO NEW-ENVIRON]
17:54:21.859153 IP (tos 0x10, ttl 64, id 51972, offset 0, flags [DF], length: 64)
192.168.1.5.telnet > 192.168.1.6.33778: P [bad tcp cksum 838e (->ed5)!] 1:13(12) ack
25 win 1448 <nop,nop,timestamp 11502586 1728315> [telnet DO TERMINAL TYPE, DO TSPEED,
DO XDISPLOC, DO NEW-ENVIRON]
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