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brctl
In a standard setup, all the Xen VM Guest systems are attached to a virtual network
bridge. brctl allows you to determine the connection between the bridge and the
virtual network adapter in the VM Guest system. For example, the output of brctl
show may look like the following:
bridge name
br0
br1
This shows, that there are two virtual bridges defined on the system. One is con-
nected to the physical ethernet device eth0, the other one is connected to a vlan
interface vlan22.
There is only one guest interface active in this setup, vif1.0. This means, that
the guest with id 1 has an ethernet interface eth0 assigned, that is connected to
br0 in the VM Host Server.
iptables-save
Especially when using masquerade networks, or if several ethernet interfaces are
set up together with a firewall setup, it may be helpful to check the current firewall
rules.
The command iptables may be used to check all the different firewall settings.
To list all the rules of a chain, or even of the complete setup, you may use the
commands iptables-save or iptables -S
9.6 Extra Guest Descriptions in Xen
Configuration
With Xen, it is possible to add an extra descriptions to the configuration of each guest.
This may be helpful for example to document the purpose of the guest, or the responsible
person to handle the guest.
The description can be set during the installation of the guest. When running
vm-install, in the Summary screen you can set the Name of Virtual Machine. The
bridge id
8000.000476f060cc
8000.00001cb5a9e7
STP enabled
interfaces
no
eth0
vif1.0
no
vlan22
Administration Tasks
87
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