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Networking issue on DomU
nico at ircqnet
Jul 8, 2005, 4:25 AM
Post #1 of 2 (312 views)
Permalink
Hello lists.

Having a problem getting network to work inside a domU.

I have 2 guests os's (the example ttylinux and a CentOS 3,3 domU).

the 2 domU's can ping each other, the dom0 can ping the outside world, incl
internet.
The 2 domU's can not ping the dom0 (or anything else) and the dom0 can not
ping the domU's.

Config dom0
Host OS is CentOS 4.0 with xen 2.0.6

[root@vps xen]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:60:08:6D:1E:C6
inet addr:10.0.0.211 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:125239 errors:0 dropped:0 overruns:0 frame:0
TX packets:1677 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17073332 (16.2 MiB) TX bytes:132617 (129.5 KiB)
Interrupt:10 Base address:0x1480

eth1 Link encap:Ethernet HWaddr 00:04:76:13:92:DA
inet addr:10.0.0.210 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:113302 errors:0 dropped:0 overruns:1 frame:0
TX packets:39535 errors:0 dropped:0 overruns:0 carrier:0
collisions:22 txqueuelen:1000
RX bytes:14854554 (14.1 MiB) TX bytes:4235423 (4.0 MiB)
Interrupt:9 Base address:0x1400

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:42137 errors:0 dropped:0 overruns:0 frame:0
TX packets:42137 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3030632 (2.8 MiB) TX bytes:3030632 (2.8 MiB)

vif30.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:34 errors:0 dropped:0 overruns:0 frame:0
TX packets:90 errors:0 dropped:145 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2378 (2.3 KiB) TX bytes:4540 (4.4 KiB)

vif51.0 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:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1120 (1.0 KiB) TX bytes:462 (462.0 b)

xen-br0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet addr:10.0.0.212 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:335 errors:0 dropped:0 overruns:0 frame:0
TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:15764 (15.3 KiB) TX bytes:756 (756.0 b)

[root@vps xen]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
10.0.0.0 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
10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0
xen-br0
0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0
eth0

domU config for the centos domu:
kernel = "/boot/vmlinuz-2.4-xenU"
memory =32
name = "centos"
nics=1
vif = [ 'mac=aa:00:00:00:00:11, bridge=xen-br0' ]
disk = [ 'phy:sda2,sda2,w' ]
dhcp="off"
root = "/dev/sda2 ro"
extra = " 3 console=tty0"
restart = 'onreboot'

[root@centos root]# ifconfig
eth0 Link encap:Ethernet HWaddr AA:00:00:00:00:11
inet addr:10.0.0.220 Bcast:10.0.0.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:462 (462.0 b) TX bytes:1120 (1.0 Kb)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:13 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1036 (1.0 Kb) TX bytes:1036 (1.0 Kb)

[root@centos root]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
IPADDR=10.0.0.220
NETMASK=255.255.255.0
NETWORK=10.0.0.0
ONBOOT=yes

[root@centos root]# netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0
eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0
eth0
0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0
eth0


(no idea where the 169.* address comes from).

the 10.0.0.1 is my router that connects to the internet, and is the default
gatwat for all systems (fysical machine).

[root@centos root]# ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data.
From 10.0.0.220 icmp_seq=0 Destination Host Unreachable
From 10.0.0.220 icmp_seq=1 Destination Host Unreachable
From 10.0.0.220 icmp_seq=2 Destination Host Unreachable


10.0.0.230 is the domU with ttylinux

[root@centos root]# ping 10.0.0.230
PING 10.0.0.230 (10.0.0.230) 56(84) bytes of data.
64 bytes from 10.0.0.230: icmp_seq=0 ttl=64 time=2.32 ms
64 bytes from 10.0.0.230: icmp_seq=1 ttl=64 time=0.343 ms
(works).

Why i can ping domU <-> domU but not domU <-> *anything else* ??

Thanks in advance,
Nico van Royen
nico@ircqnet.org


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Re: Networking issue on DomU [ In reply to ]
e.bachmann at xebec
Jul 8, 2005, 11:40 AM
Post #2 of 2 (298 views)
Permalink
Hi,

On Friday 08 July 2005 13:25, Nico wrote:
> Hello lists.
>
> Having a problem getting network to work inside a domU.
>
> I have 2 guests os's (the example ttylinux and a CentOS 3,3 domU).
>
> the 2 domU's can ping each other, the dom0 can ping the outside world, incl
> internet.
> The 2 domU's can not ping the dom0 (or anything else) and the dom0 can not
> ping the domU's.
>
> Config dom0
> Host OS is CentOS 4.0 with xen 2.0.6
>
> [root@vps xen]# ifconfig
> eth0 Link encap:Ethernet HWaddr 00:60:08:6D:1E:C6
> inet addr:10.0.0.211 Bcast:10.0.0.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:125239 errors:0 dropped:0 overruns:0 frame:0
> TX packets:1677 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:17073332 (16.2 MiB) TX bytes:132617 (129.5 KiB)
> Interrupt:10 Base address:0x1480
>
> eth1 Link encap:Ethernet HWaddr 00:04:76:13:92:DA
> inet addr:10.0.0.210 Bcast:10.0.0.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:113302 errors:0 dropped:0 overruns:1 frame:0
> TX packets:39535 errors:0 dropped:0 overruns:0 carrier:0
> collisions:22 txqueuelen:1000
> RX bytes:14854554 (14.1 MiB) TX bytes:4235423 (4.0 MiB)
> Interrupt:9 Base address:0x1400
>
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:42137 errors:0 dropped:0 overruns:0 frame:0
> TX packets:42137 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:3030632 (2.8 MiB) TX bytes:3030632 (2.8 MiB)
>
> vif30.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:34 errors:0 dropped:0 overruns:0 frame:0
> TX packets:90 errors:0 dropped:145 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:2378 (2.3 KiB) TX bytes:4540 (4.4 KiB)
>
> vif51.0 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:7 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:1120 (1.0 KiB) TX bytes:462 (462.0 b)
>
> xen-br0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
> inet addr:10.0.0.212 Bcast:10.255.255.255 Mask:255.0.0.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:335 errors:0 dropped:0 overruns:0 frame:0
> TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:15764 (15.3 KiB) TX bytes:756 (756.0 b)

Looks like your bridge isn't setup correctly.
at least one of your real network ifaces (eth0 or eth1) should be running
without IP Address, be enslaved to xen-br0, and xen-br0 should have the IP it
had earlier.
the bridge should then use the HW/MAC Addr of that nic.

check "brctl show xen-br0"

If you don't want to bridge your network directly, but route instead, you'd
have to setup a MAC Addr for that bridge, give it an IP from a different
subnet, enable routing, and enable IP-Forwarding.

Hope that pointed you in the right direction,
/Ernst

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