Marco wrote a useful post yesterday about some less widely known features of iproute.

I didn’t know about the dummy interface:

ip link add mydummy type dummy

but I’ve definitely used the tun/tap driver before. I always forget the syntax so I’ll jot it here for reference:

ip tuntap add dev mytap mode tap user albertlash

Also mentioned is one of my all-time favorite iproute features: GRE tunnels!

ip link add blah type gretap remote 192.168.8.1
ip link add barf type gretap help

I’m thrilled that pfsense will soon include GRE tunneling support!