Re: IPIP Tunnelling.

David Woodhouse (
Wed, 06 Aug 1997 09:54:54 +0100 said:
> A tunnel should be placing the output device as the encapsulating
> address for the tunnel.

Or, as RFC2003 puts it:
> The fields in the outer IP header are set by the encapsulator as
> follows:
> Source Address
> The IP address of the encapsulator, that is, the tunnel entry
> point.

Has anyone done any work on ICMP handling for the tunnel driver? said:
>>> Another thing I'd like to do is add IPIP compression to the tunnel
>>> driver. What's the best way to go about it?
>> I believe you need to invent new protocol and register it to avoid
>> conflicts :-)

Someone beat me to it :)

> Another option is to implement L2F/PPTP.

Or even IPPCP - which is almost precisely what I'm after. The only bit I'm not
too happy about with IPPCP is the negotiation using ISAKMP. However, as things
like IPsec are appearing in the kernel, I hope^H^H^H^Hsuppose someone's
already working on that - can anyone confirm this?

If I'm going to use IPPCP, I'll put together a driver without the negotiation,
which needs the compression type setting manually, but has hooks for proper
ISAKMP configuration when it's complete. Does that sound like the right way to

/* IPPCP: IP Payload Compression Protocol

David Woodhouse,	CB3 9AN 		 Tel: 0976 658355	 Tel: 01279 402332