[pptp-server] how to detect GRE filtering?

[kukulkan]

Hi there again,
        I am trying to check that whether my internet connection(our network and
ISP) is implementing some form of filtering. Help me to make a decision.  I have
downloaded the patch for GRE traceroute , compile and run successfully. Again,
please, please  correct me if I am wrong.

I also have tried to use the traceroute with -G option:

test  # 1 - traceroute -G 192.168.216.98

and it gave me several  error just before the pptp server, the router  in front
of  my PPTP server(192.168.216.98)

test # 2 - traceroute -G -p 1723 192.168.216.98

and both  gave me the same error.

1  e0.kch8.xxx.my (xxx.142.221.9)  116.096 ms  117.333 ms  120.209 ms
 2  fe0-0-0.kch.xxx.my (xxx.142.221.1)  119.418 ms  129.945 ms  119.755 ms
 3  fe0.kch15.xxx.my (xxx.142.221.16)  119.861 ms fe1.kch15.xxx.my
(xxx.142.0.74)  119.767 ms fe0.kch15.xxx.my (xxx.142.221.16)  119.798 ms
 4  xxx.142.33.210 (xxx.142.33.210)  339.815 ms !X  321.584 ms !X *

My question is,

i) is there any  difference with the traceroute with -G(use GRE packets instead
of UDP packets) test # 1.
ii)or  the -G with port specification  1723?

in other words, is it *neccessary*  for me to include the port specification -
port 1723 to check whether my GRE is being filtered?

Need advice


robert wrote:

> There are some GRE patched traceroute rpms at http://home.swbell.net/berzerke
>
> On Monday 28 May 2001 22:09, Ismandy Ali wrote:
> > Hi  all,
> >      Correct me if I am wrong. One way to detect that there is some kind
> > of filtering on port 1723 is using traceroute to the port 1723. So, how
> > to detect that there is some kind of filtering  on  protocol 47 for GRE?
> >
> > any help is greatly appreciated
> >
> > Kukulkan
> >
> >
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