This is the GRE(PPTP) patch from http://www.impsec.org/linux/masquerade/ip_masq_vpn.html
hacked into traceroute_1.4a12 from unstable (builds happily on stable). The .dsc and .diff.gz are at http://www.planet.net.au/~neale/debian/traceroute-GRE/ (you'll need traceroute_1.4a12.orig.tar.gz from a Debian mirror plus the usual tools to build the .deb). The README-GRE: ========================================================================== GRE (PPTP) patched traceroute. ============================== This version of traceroute incorporates a patch to provide an option to use GRE packets (with PPTP-like payload). This functionality is useful for debugging internetworking that has the dubious feature of blocking GRE packets, and thus breaking GRE tunneling such as used by PPTP. The original patch is at: ftp://ftp.rubyriver.com/pub/jhardin/masquerade/pptp-traceroute.patch.gz It was hacked into the Debian package traceroute_1.4a12-3 by Neale Banks <[EMAIL PROTECTED]> IMPORTANT: Please do not worry Herbert Xu (maintainer of the official Debian traceroute package) about this hacked package. Neale Banks <[EMAIL PROTECTED]> March 2001 ========================================================================== As goes with this kind of thing: no warranties of any kind (express, implied or otherwise) - this is offered in the hopes that (a) somebody might find it useful and (b) somebody might find something I've overlooked. Regards, Neale.