Re: What does TCB stand for?

From: scott w (
Date: Mon Jul 30 2001 - 21:34:26 EDT

Hello Again Everyone,

After more rentless searching I found the answer to my own question.
It has to do with BSD, but I'm sure it's fairly revelant in the cisco
case... Also thanks to Eric for his help as well.



       Internet Protocol Control Block Structure (inpcb{}): PCB's are used
at the transport layer by TCP (and UDP) to hold various pieces of
information needed by TCP. They hold: TCP state information, IP address
information, port numbers, IP header prototype and options and a pointer
to the routing table entry for the destination address. PCB's are
created for a given TCP based server when the server calls listen(),

       TCP Control Block Structure (tcpcb{}): The TCP control block
contains TCP specific information such as timer information, sequence
number information, flow control status, and OOB data.

On Mon, 30 Jul 2001, scott w wrote:

> Hello Everyone,
> I saw these while a router was in TCP debug mode:
> Jul 30 13:57:11: TCB629C01
> Jul 30 13:57:11: TCB629C018C bound to
> Jul 30 13:57:11: TCB629C018C connected to
> Jul 30 13:57:12: TCB 0x629C018C destroyed
> Does TCB stand for TCP Control Block as in RFC 2140? Or is it
> Transmission Control Block as I've been finding in
> If the second, can someone give me details as I can't find anything useful
> in
> Thanks,
> scott

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