[libvirt-users] Remove Virtual bridge and DNSMASQ

I am running KVM virtualization with libvirtd (libvirt) 0.10.2 in bridged network mode, however I still have the default virtual network bridge/interfaces and dnsmasq on the host. What I am trying to understand is whether or not dnsmasq and the virtual network (*virbr0, Vnet0 and Vnet1*) still play any role. If not, can I remove them? On most virtual hosts I see they are left around even when a network bridge has been manually setup and the default virtual network bridge/interfaces and dnsmasq are not serve any purpose. Thanks Mimi [bigfoot@localhost ~]$ ifconfig br0 Link encap:Ethernet HWaddr E2:59:52:12:34:4C inet addr:135.17.1XX.XX Bcast:135.17.1XX.XX Mask:255.255.255.128 inet6 addr: fe80::ea39:35ff:fe12:948e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:564577 errors:0 dropped:0 overruns:0 frame:0 TX packets:303315 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:566465184 (540.2 MiB) TX bytes:83532692 (79.6 MiB) eth0 Link encap:Ethernet HWaddr E2:59:52:12:34:4C inet6 addr: fe80::ea39:35ff:fe12:948e/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:806142 errors:0 dropped:0 overruns:0 frame:0 TX packets:450977 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:711888772 (678.9 MiB) TX bytes:175377460 (167.2 MiB) Interrupt:28 Memory:f7100000-f7120000 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:276793 errors:0 dropped:0 overruns:0 frame:0 TX packets:276793 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:551259266 (525.7 MiB) TX bytes:551259266 (525.7 MiB) *virbr0 Link encap:Ethernet HWaddr 52:54:00:2A:1B:AF* * inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0* * UP BROADCAST RUNNING 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)* *vnet0 Link encap:Ethernet HWaddr FE:54:00:A0:8D:50* * inet6 addr: fe80::fc54:ff:fea0:8d50/64 Scope:Link* * UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1* * RX packets:124812 errors:0 dropped:0 overruns:0 frame:0* * TX packets:343055 errors:0 dropped:0 overruns:0 carrier:0* * collisions:0 txqueuelen:500* * RX bytes:55075362 (52.5 MiB) TX bytes:138488556 (132.0 MiB)* *vnet1 Link encap:Ethernet HWaddr FE:54:00:71:A8:78* * inet6 addr: fe80::fc54:ff:fe71:a878/64 Scope:Link* * UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1* * RX packets:17834 errors:0 dropped:0 overruns:0 frame:0* * TX packets:318816 errors:0 dropped:0 overruns:1 carrier:0* * collisions:0 txqueuelen:500* * RX bytes:2279102 (2.1 MiB) TX bytes:20534286 (19.5 MiB)* [bigfoot@localhost ~]$