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Re: [Xen-users] Network routing setup problem; domU won't start

from [Rich Wales] [Permanent Link][Original]
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Network routing setup problem; domU won't start
From: Rich Wales <richw@xxxxxxxxx>
Date: Tue, 11 Dec 2007 21:56:43 -0800
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User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.9) Gecko/20071031 Thunderbird/2.0.0.9 Mnenhy/0.7.5.666 
Getting back to my "xm create" network failure:

I think I figured out at least part of what was going wrong.  I
needed to add a "netdev=" parameter in my "vif-script" line.  Once
I did this, the domU came up OK.

However, I've still got a problem.  The new domU does not seem to
be accessible via the net -- not even from the dom0.

Here's what I have so far.  (I moved the "ifconfig" settings for
dom0's dummy interface to my internal bridge out of my custom
network script and into /etc/network/interfaces.)

I notice, BTW, that none of the vif#.#'s in my dom0 have been
assigned the IP address of my domU.  I thought that was supposed
to happen; or am I misunderstanding how the networking works?

/etc/xen/xend-config.sxp
--------------------------------------
(xen-api-server ((unix)))
(xend-http-server yes)
(xend-unix-server yes)
(xend-relocation-server no)
(xend-port 8000)
(xend-address '')
(xend-relocation-hosts-allow '')
(network-script network-whodunit)
(vif-script 'vif-route netdev=dummy0')
(dom0-min-mem 196)
(dom0-cpus 0)
(vncpasswd '')

/etc/xen/scripts/network-whodunit
--------------------------------------
#!/bin/sh
XENDIR="/etc/xen/scripts"
$XENDIR/network-bridge "$@" netdev=eth0   bridge=xenbr0 vifnum=0
$XENDIR/network-bridge "$@" netdev=eth1   bridge=xenbr1 vifnum=1
$XENDIR/network-bridge "$@" netdev=dummy0 bridge=xenbr2 vifnum=2

/etc/xen/template.cfg
--------------------------------------
kernel      = '/boot/vmlinuz-2.6.22-14-xen'
ramdisk     = '/boot/initrd.img-2.6.22-14-xen'
memory      = '384'
root        = '/dev/hda1 ro'
disk        = [ 'phy:vg1/template-disk,hda1,w', 'phy:vg1/template-swap,hda2,w' ]
name        = 'template'
vif         = [ 'mac=f2:01:72:31:53:ff, ip=172.31.53.254, bridge=xenbr2' ]
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

/etc/network/interfaces
--------------------------------------
auto lo
iface lo inet loopback

auto eth1
iface eth1 inet static
    address 172.29.0.53
    netmask 255.255.255.0
    gateway 172.29.0.2
    post-up ethtool -K eth1 tx off

auto dummy0
iface dummy0 inet static
    address 172.31.53.1
    netmask 255.255.255.0

output of "ifconfig -a"
--------------------------------------
dummy0    Link encap:Ethernet  HWaddr 7E:0E:19:BD:A7:D6
          inet addr:172.31.53.1  Bcast:172.31.53.255  Mask:255.255.255.0
          inet6 addr: fe80::7c0e:19ff:febd:a7d6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:140 (140.0 b)  TX bytes:3307 (3.2 KB)

eth0      Link encap:Ethernet  HWaddr 00:13:D4:23:58:6B
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Interrupt:10 Base address:0xe000

eth1      Link encap:Ethernet  HWaddr 00:13:D4:23:71:66
          inet addr:172.29.0.53  Bcast:172.29.0.255  Mask:255.255.255.0
          inet6 addr: fe80::213:d4ff:fe23:7166/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:15921 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1437 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1245151 (1.1 MB)  TX bytes:124550 (121.6 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:448 (448.0 b)  TX bytes:448 (448.0 b)

pdummy0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:3727 (3.6 KB)

peth1     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:15929 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1445 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1313653 (1.2 MB)  TX bytes:137238 (134.0 KB)
          Interrupt:5

veth0     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

veth3     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

vif0.1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:1437 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15923 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:124550 (121.6 KB)  TX bytes:1245291 (1.1 MB)

vif0.2    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3307 (3.2 KB)  TX bytes:210 (210.0 b)

vif0.3    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet addr:172.31.53.1  Bcast:172.31.255.255  Mask:255.255.255.255
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23 errors:0 dropped:9 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 b)  TX bytes:2779 (2.7 KB)

xenbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:90 (90.0 b)

xenbr1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14063 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:916374 (894.8 KB)  TX bytes:300 (300.0 b)

xenbr2    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3027 (2.9 KB)  TX bytes:238 (238.0 b)

output of "netstat -rn"
--------------------------------------
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
172.31.53.254   0.0.0.0         255.255.255.255 UH        0 0          0 vif1.0
172.31.53.0     0.0.0.0         255.255.255.0   U         0 0          0 dummy0
172.29.0.0      0.0.0.0         255.255.255.0   U         0 0          0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
0.0.0.0         172.29.0.2      0.0.0.0         UG        0 0          0 eth1

output of "iptables -n -L"
--------------------------------------
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     0    --  172.31.53.254        0.0.0.0/0           PHYSDEV match
--physdev-in vif1.0
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           PHYSDEV match
--physdev-in vif1.0 udp spt:68 dpt:67

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

output of "xm network-list 1"
--------------------------------------
Idx BE     MAC Addr.     handle state evt-ch tx-/rx-ring-ref BE-path
0   0  f2:01:72:31:53:ff    0     4      8     768  /769
/local/domain/0/backend/vif/1/0

relevant piece of /boot/grub/menu.lst
--------------------------------------
title           Xen 3.1 / Ubuntu 7.10, kernel 2.6.22-14-xen
root            (hd0,0)
kernel          /xen-3.1.gz dom0_mem=256M
module          /vmlinuz-2.6.22-14-xen
root=UUID=2c8d1c7c-4211-4497-9cc3-85cf4521c438 ro console=tty0
module          /initrd.img-2.6.22-14-xen
quiet

-- 
Rich Wales      ===      Palo Alto, CA, USA      ===     richw@xxxxxxxxx
http://www.richw.org   ===   http://en.wikipedia.org/wiki/User:Richwales

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