Received this error trying to create a GRE tunnel:

[ interfaces tunnel tun0 remote-ip 167.225.xx.xx ]
add tunnel "tun0" failed: Invalid argument

[[interfaces tunnel tun0]] failed

With a bit of trial and error - if I blow tun0 away and recreate like this it works fine:

set remote-ip xxxx
set local-ip xxxx
set encap gre

commit

set address xxxxx/30
set desc "description"
set mtu 1400

commit
save

If I try to set and commit all items in one go it gives the error above and refuses to commit the remote-ip.

View forum discussion here:

http://forum.vyos.net/showthread.php?tid=26805