[Gllug] sorts of ports

[William Palfreman]

On Mon, 3 Sep 2001, David Damerell wrote:
> 
> Er, not quite.
> 
> Normally your Ethernet (or modem) hardware knows nothing about TCP/IP
> at all, including IP port numbers. IP packets are entirely
> encapsulated in packets for the lower-level transport, like this;
> 
> /here's the stuff your Ethernet /this here is an IP packet   \\
> |card understands, that tells   |that the Ethernet card will ||
> |it this is for this machine and|pass unchanged to the OS and||
> \not a lot else.                \contains an IP port number  //

Tut tut Mr Damerell, years of experience and confusing newbies with
talk of IP port numbers?  I think it was you who advised me to the
O'Reilly TCP/IP Network Administration (a great book, BTW).  Surely you
are talking about TCP and UDP ports, as as we both know, IP packets don't
have port numbers, right?

Regards,
Bill.


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