[AusNOG] TCP - Fast Retransmit / Normal Retransmit times

[PRK]

Hi all,

Anyone full bottle on TCP at a base protocol level?

In particular, what's the expected behaviour if a Fast Retransmit (of a 
packet that's been lost/dropped) also gets lost/dropped?

How long would be expected before a normal retransmit should be sent?

I've been working through 
http://repo.hackerzvoice.net/depot_madchat/ebooks/TCP-IP_Illustrated/tcp_time.htm 
and other web resources, and I can see that a Fast Retransmit is after 3 
duplicate Acks are received - makes sense.

Separately, a normal retransmit will back off exponentially at 1.5, 3, 
6, 12, 24, 48 & 64 seconds. Again, makes sense.

But I can't quite marry the two into the same situation. If the Fast 
Retransmit is lost/dropped, would I expect the 1.5 seconds until a 
normal retransmit, or would I expect 64 seconds, or somewhere inbetween?

prk.