[pptp-server] Traceroute for GRE packets ??

[Neale Banks]

On Wed, 11 Jul 2001, G. Georgiev wrote:

>         A problem with pptp client - the GRE tunnel does not
> build over my cable modem link. The control channel, which is
> a pure TCP link start fine, but it looks like some router on
> my ISP network blocks GRE traffic. 
> 
>         Is there some tool which may like traceroute check
> what's happening with GRE packets? This way I may find the
> offending router and may be convince my ISP to correct it?

Unix traceroute patched for GRE packets?

See http://www.impsec.org/linux/masquerade/ip_masq_vpn.html for the
original patch and a pointer to my effort at patching the Debian
traceroute package.

There is a rpm gre patched traceroute at http://home.swbell.net/berzerke

HTH,
Neale.