FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Ubuntu > Ubuntu User

 
 
LinkBack Thread Tools
 
Old 01-17-2009, 10:09 PM
Smoot Carl-Mitchell
 
Default ngrep o/p -

On Sat, 2009-01-17 at 13:43 -0800, Evuraan::ഏവൂരാന്* wrote:
> What does [A] and [AP] mean on a typical ngrep o/p?
>
> # ngrep -i "keep-alive" port 80 -W byline
>
>
> <snip>
> T 192.168.1.100:80 -> 66.249.67.42:57891 [A]
> T 66.249.67.42:43897 -> 192.168.1.100:80 [AP]
> <snip>
>
> I know T is for TCP, what does {A] and [AP] at the end of the line mean?

I believe those are the TCP control bits found in the TCP header. "A"
is acknowledgement and "P" is push. The push bit tells the receiving
TCP to push the data immediately to the receiving application. The
acknowledgement bit tells the receiver how much data it has sent to the
sender which has been acknowledged by the sender. Remember TCP is
bidirectional. It is part of what makes TCP a reliable transport
protocol.

See http://www.ietf.org/rfc/rfc0793.txt

for all the gory details.
--
Smoot Carl-Mitchell
Computer Systems and
Network Consultant
smoot@tic.com
+1 480 922 7313
cell: +1 602 421 9005

--
ubuntu-users mailing list
ubuntu-users@lists.ubuntu.com
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users
 

Thread Tools




All times are GMT. The time now is 06:32 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright 2007 - 2008, www.linux-archive.org