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Network Security Security-Basics
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Re: FW: cisco IOS firewall terminating pptp

Subject: Re: FW: cisco IOS firewall terminating pptp
Date: Fri, 26 Nov 2004 08:52:47 -0600
"Mark Lewis" <mark@mjlnet.com> wrote on 11/24/2004 04:44:20 PM:

Andrew,

Because the control channel runs over TCP, NAT/PAT boxes typically don't
have a problem with it. But because the data tunnel (which transports 
end
user traffic over PPP) runs over GRE (IP  port 47), NAT/*PAT* boxes may 
have
problems translating data tunnel packets.


That's IP protocol 47, if it was just port 47, then you'd still just be 
talking about a TCP port

-jamie-

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