Scapy in mininet

Scapy is a packet forging tool/library for python.
Mininet is a network emulator.
It would be nice to use them together, however when trying to use scapy in mininet namespace it throws an exception:

*IOError: [Errno 99] Cannot assign requested address*

The solution is to bring loopback interface up. Just type

mininet> xterm h2

and then in xterm

# ifconfig lo up

now you can run scapy. In invoked xterm type:

#scapy