[Twisted-Python] UDP with multiple connections

Simon Pickles sipickles at hotmail.com
Fri Oct 12 14:14:15 EDT 2007

I thiank you all for your tiem and patience. My understanding has 
developed somewhat :)

Carl Zmola wrote:
> I would like to make a general comment about the use of UDP in 
> applications.  There are some people on this list who can do some 
> tricky things with UDP, but as a general rule, what should be 
> recommended is "use TCP".  If you end up running into issues that TCP 
> has problems with, there are other options, but you should have tried 
> TCP first.  If you are asking advise on this forum on using UDP, the 
> first reply should always be: "Why arn't you using TCP?", and the 
> second reply should be "Have you actually tried TCP and seen problems 
> with it?"
> UDP is fun and if you know what you are doing, you can get some 
> benefits out of it, but you have to put an awful lot of work into it 
> and I have seen many cases where the promised benefits of using UDP 
> are not seen.
> Areas where UDP can give some benefits are:
>  Overcoming latency due to a 3way handshake,
>  reducing cost if you are charged by the byte (but this can be eaten 
> up by development cost and retransmission),
>  multicast (but you then need to have control over your network).
> I have heard of at least one case where large UDP applications have 
> been put in due to the perceived benefits, only to be replaced by a 
> TCP application that actually works.
> -- 
> Carl
> zmola at acm.org
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