whollygoat@letterboxes.org
2009-Nov-15 07:14 UTC
[Xen-users] noob tries to understand networking
Networking is working, it just doesn''t look what
the docs I''ve been reading tell me. Not
understanding how the pieces fit, I''m not sure
how to adapt iptables to the renamed interfaces
and copying of MAC and IP addresses.
First the specs. I''ve probably left something
important out. Sorry.
Single NIC computer, using xen bridging.
# cat /etc/debian_version
5.0.3 (lenny)
# uname -a
Linux fly 2.6.26-2-xen-amd64 #1 SMP Thu Nov 5 04:27:12 UTC 2009 x86_64
GNU/Linux
# xm dmesg | head -1
(XEN) Xen version 3.2-1 (Debian 3.2.1-2) (waldi@debian.org) (gcc version
4.3.1 (Debian 4.3.1-2) ) Sat Jun 28 09:32:18 UTC 2008
There are a million things I don''t understand, but probably
the most fundamental is what the virtual pieces are, and
how they all fit together. The only thing I changed in
/etc/xen/xend-config.sxp is to change (network-script
network-dummy) to (network-script network-bridge).
Everything I''ve read so far leads me to expect to find
1) a bridge named xenbr0,
2) a real interface called peth0
with no MAC or IP,
3) a virtual interface called eth0
with a MAC and IP, and
4) a vif<domID>.<domIF> for every
domain.
But I appear to have a bridge and a virtual
interface called eth0, a peth0 with a MAC
and ip6 address, and no vif for dom0.
n# ifconfig
eth0 Link encap:Ethernet HWaddr 00:11:09:62:29:04
inet addr:192.168.153.200 Bcast:192.168.153.255
Mask:255.255.255.0
inet6 addr: fe80::211:9ff:fe62:2904/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14892 errors:0 dropped:0 overruns:0 frame:0
TX packets:14100 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1207077 (1.1 MiB) TX bytes:2677763 (2.5 MiB)
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:104 errors:0 dropped:0 overruns:0 frame:0
TX packets:104 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:13683 (13.3 KiB) TX bytes:13683 (13.3 KiB)
peth0 Link encap:Ethernet HWaddr 00:11:09:62:29:04
inet6 addr: fe80::211:9ff:fe62:2904/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:14921 errors:0 dropped:0 overruns:0 frame:0
TX packets:14110 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1422189 (1.3 MiB) TX bytes:2678559 (2.5 MiB)
Interrupt:20 Base address:0xa000
vif1.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:253 errors:0 dropped:104 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 B) TX bytes:39872 (38.9 KiB)
# brctl show
bridge name bridge id STP enabled interfaces
eth0 8000.001109622904 no peth0
vif1.0
Can anyone help me to figure out how this is all
working together?
Thanks,
will
--
whollygoat@letterboxes.org
--
http://www.fastmail.fm - Or how I learned to stop worrying and
love email again
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