[pptp-server] Poptop and port 47

kim oppalfens kimoppalfens at freegates.be
Thu Aug 31 09:57:33 CDT 2000


Huh?
I am pretty much confused right now.
How do I specify an firewall rule to allow a specific protocol through? 
And should I open up a specific port in my firewall for this 47 protocol?
Is there something happening on port 47 that is pptp related??

> It's protocol 47 (GRE) which you have to forward (not
> port 47).
> 
> -Scott
> --- kim oppalfens <kimoppalfens at freegates.be> wrote:
> > Hi,
> > 
> > I am running poptop versie 0.9.1 on a Linux Router
> > Project based pc.
> > The problem I have is when I try to connect from the
> > outside, a pc connected
> > to the internet somewhere, I cannot connect. (He
> > stops during the verify
> > username
> > and password.) If I do the same from my internal net
> > I can connect without
> > any problem.
> > 
> > In my firewall rules I let 1723 and 47 through the
> > firewall.
> > Which brings me to the probable cause of my problem.
> > My isp is blocking alot of ports under the 1024
> > boundary.
> > These ports are denied for anyone not coming from my
> > isp's network.
> > So the 47 port is probably locked.
> > Can anyone tell me what this port 47 is for?
> > And if there is anyway to change the port to
> > something above the 1024
> > boundary.
> > If so what should I do to tell the windows vpn
> > clients to use the other
> > port?
> > 
> > Tnx in advance
> > Kim Oppalfens
> > 
> > 
> > 
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