Wednesday, July 7, 2010

Okay, this is a weird one -- Synless Acking

So, the normal TCP three way handshake looks like this:

Client Server
SYN --------->
<--------- SYN/ACK
ACK --------->

I'm seeing packet traces that show my first connection attempt does this:

Client Server
SYN --------->
<--------- ACK (with no SYN)
then nothing until a new SYN from the client

Which ... I mean ... That's a big pile of WTF going on there.

I'm not quite sure what's going on, here, but *something* is.

1 comment:

  1. Well? Is there something between the two being wonky?



About Me

My photo
Regis has worked as a network engineer since 1994 for small companies and for large companies.