[pptp-server] how to detect GRE filtering?
kukulkan
ismandya at sains.com.my
Tue May 29 21:53:48 CDT 2001
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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