Mystery interface reported by ip.

[peter@easthope.ca]

root@joule:/etc# ip link show | grep rename
4: rename4: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000

root@joule:/etc# find . -type f -exec grep "rename4" '{}' \; -print
root@joule:/etc#

So ip reports an interface named rename4 but it doesn't 
appear anywhere in /etc/.  Where does the name originate?

Thanks,           ... Peter E.
 
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