> Starting from kernel 2.5.49 IPSec went into the tree: if you need > encryption and authentication that could be a solution > (probably better > than freeswan, since the later was not considered for > inclusion into the > kernel). I don't need them, so I'm sticking with plain gre > tunnels and > linux-2.4.20 I'm noticing the the IPSec implimentation uses/is protocol 50 -p 50 Will any version of IPTables recognise this or will I be needing to update To the latest version of IPTables. I think I'm leaning towards 2.5.49 kernel Implimentation givin I can trim it down enough to get something relitivly stable.