Bridging - cannot ping other DomU hosts

["Doug Sampson" <dougs%dawnsign.com@localhost>]

Hello-

I'm following the NetBSD Xen tutorial at
http://www.lumbercartel.ca/library/xen/how-to and I've got two Windows
Xen instances going. Today I discovered that I couldn't ping to the
second Windows DomU from the other Windows DomU and vice versa. I also
discovered that none of the Windows DomU domains could ping the Xen
machine. But I can ping Dom0 and all DomU instances from outside the Xen
host inside the LAN. Do I need to modify the routing tables in the Xen
host in order to allow pinging within the Xen environment? 


Does the ifconfig output look correct?:

xen# ifconfig -a
wm0: flags=8b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST>
mtu 1500
 
capabilities=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UD
P4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx,TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TS
O6>
        enabled=0
        address: 00:30:48:df:3a:fa
        media: Ethernet autoselect (1000baseT
full-duplex,flowcontrol,rxpause,txpause)
        status: active
        inet 192.168.101.42 netmask 0xffffff00 broadcast 192.168.101.255
        inet6 fe80::230:48ff:fedf:3afa%wm0 prefixlen 64 scopeid 0x1
wm1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
 
capabilities=7ff80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UD
P4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx,TCP6CSUM_Tx,UDP6CSUM_Rx,UDP6CSUM_Tx,TS
O6>
        enabled=0
        address: 00:30:48:df:3a:fb
        media: Ethernet autoselect
        status: no carrier
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33648
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
bridge0: flags=41<UP,RUNNING> mtu 1500
xvif3.0: flags=8923<UP,BROADCAST,NOTRAILERS,PROMISC,SIMPLEX,MULTICAST>
mtu 1500
        capabilities=2800<TCP4CSUM_Tx,UDP4CSUM_Tx>
        enabled=0
        address: 00:16:3e:01:00:13
        inet6 fe80::216:3eff:fe01:13%xvif3.0 prefixlen 64 scopeid 0x9
tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu
1500
        address: f2:0b:a4:40:32:0f
        media: Ethernet autoselect
        inet6 fe80::f00b:a4ff:fe40:320f%tap0 prefixlen 64 scopeid 0xa
xvif5.0: flags=8923<UP,BROADCAST,NOTRAILERS,PROMISC,SIMPLEX,MULTICAST>
mtu 1500
        capabilities=2800<TCP4CSUM_Tx,UDP4CSUM_Tx>
        enabled=0
        address: 00:16:3e:01:00:14
        inet6 fe80::216:3eff:fe01:14%xvif5.0 prefixlen 64 scopeid 0xc
tap1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu
1500
        address: f2:0b:a4:36:f5:16
        media: Ethernet autoselect
        inet6 fe80::f00b:a4ff:fe36:f516%tap1 prefixlen 64 scopeid 0xd
xen#


contents of xend-config.sxp:

(xend-relocation-server yes)
(xend-relocation-hosts-allow '^localhost$ ^localhost\.localdomain$')
(network-script network-bridge)
(vif-script vif-bridge)
(dom0-min-mem 196)
(enable-dom0-ballooning no)
(dom0-cpus 0)
(vnc-listen '0.0.0.0')
(vncpasswd '********')
(qemu-dm-logrotate-count 9)


I wish to use the same IP addressing range used for the entire LAN for
all xen hosts. Do I need to add routes somewhere?

~Doug