[Wylug-help] Ethernet Type Codes for IPSEC

[Jim Jackson]

On Tue, 2 Dec 2003, Daniel Walker wrote:

> I ask because I have two of these ubiquotous Conexant ADSL routers (One
> at home, one at work) and I was hoping I wouldn't have to either use
> PPTP (which is TCP/IP over TCP/IP, which I am told is bad)

No it's IP over GRE, (IP protocol 47). If the necapsulated IP packet is
TCP then it's TCP over IP over GRE

The sockets you have open on a functioning PPTP link are e.g.

tcp        0      0 129.11.144.33:1723      192.168.147.199:1069    ESTABLISHED 21469/pptpd [192.16
raw        0      0 129.11.144.33:47        192.168.147.199:*       1

The TCP stream is a control channel between the PPTP client and server and
RAW stream is the GRE/IP stream. Suspect you've been mislead.
see  rfc2784

Jim