Problems with gif tunnels

[Stephen J. Bevan]

Greg 'groggy' Lehey writes:
 > It's currently pushing 7:30 pm, and I was going to send out a reply
 > tomorrow.  But indeed, it seems that Linux people prefer GRE tunnels,
 > we prefer (with good reason) IP tunnels, ...

Like FreeBSD, Linux supports both GRE and IPIP.  It is not a Linux
thing to use on over the other, rather GRE is/was much more common for
creating tunnels because a) it is multiprotocol and so can easily
carry Appletalk or IPX as well as IP and b) because of a) Cisco docs
are full of example of how to setup GRE tunnels which means almost any
network sysadmin is familar with using them and so often defaults to
using them.  Now that Appletalk and IPX are (almost) a distant memory
and Cisco hegemony is not quite so strong then IPIP are becoming more
common.