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How do I remove a bridge that has an IP address that was brought up manually and isn't in /etc/network/interfaces?

$ ifconfig br100                                                
    br100     Link encap:Ethernet  HWaddr 00:00:00:00:00:00                         
              inet addr:  Bcast:  Mask:

Can't delete it:

# brctl delbr br100
bridge br100 is still up; can't delete it   

Can't bring it down with ifdown:

# ifdown br100                                                  
ifdown: interface br100 not configured     
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Tried ifconfig br100 down? – user13742 Feb 15 '12 at 16:15
up vote 42 down vote accepted

Figured it out:

# ip link set br100 down
# brctl delbr br100
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To clarify this for future.

ifup and ifdown are commands from some flavours of linux. And are used to control network settings set in /etc/network/interfaces for debian based systems and /etc/sysconfig/network-scripts/ifcg* on Redhat based systems (I cannot comment on others).

Creating and removing interfaces manually is done by using ifconfig (or ip which is bit more tricky to use). Bridges can be controlled with brctl

So after removing all interfaces from a bridge with brctl delif <bridg> <if> it can be moved to "down state" with ifconfig br100 down (or ip link set br100 down) and can now be removed with brctl delbr br100

Please note that using network-manager to manage your networks might make your manually changed interfaces to reset.

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