From: thefed <fedzor@...>
Date: 2007-11-30T06:18:07+09:00
Subject: Re: Custom Protocol


On Nov 29, 2007, at 8:37 AM, Francis Cianfrocca wrote:

> I took a very quick look at UDT and I think it's quite interesting.  
> The
> basic approach has appeared before (people were discussing the
> "long-fat-pipe" problem in TCP even before the WWW came along), but  
> I like
> the optimizations in this one.
>
> If I read their material correctly, UDT is based completely on UDP so
> there's no need for you to create another protocol at the IP level
> (analogous to TCP, UDP, ICMP, etc). That means you don't need raw  
> sockets,
> which makes your task considerably easier. You don't need to  
> construct the
> IP header either.
>
> Instead, implementing UDT is analogous to rebuilding TCP inside of  
> sets of
> related UDP packets. Is there any particular reason you want to do  
> this in
> Ruby rather than just wrapping a C or Java implementation?

The reason I'd like to do it in Ruby is first for my comprehension of  
the code. Second, the only implementation so far is in C++, and the  
bindings there are pretty messy (I think). UDT + Ruby DSL = a lot  
nicer, IMHO.

As you might've seen, there is a lot of information, such as the sub- 
sequence number and a variety of other things that are important and  
pertain to the packets. If I didn't use raw sockets, wouldn't that  
information be held in the payload?

Thanks,
Ari