[p2p-hackers] MTU in the real world

[walter harms]

i had problems with firewalls (at least once) with MTU 1500 and larger.
obscure features (like ching mtu) are not good tested and can cause 
problems in strange places. a veriation would be to change the mtu with
every packet an see what happens. so you can optimise for every connection.

re,
	walter


David Barrett wrote:
> I've read in multiple places that it's best to have a UDP MTU of under 
> 1500 bytes.  However, it sounds like most of this is based on 
> theoretical analysis, and not on real-world experience.
> 
> With this in mind, have you tried using a MTU bigger than 1500 bytes and 
> been bitten by it?  Basically, do you know of any emperical analysis (of 
> any level of formality) of a real-world UDP application that supports or 
> refutes the 1500 byte rule of thumb?
> 
> Furthermore, I've read that if you "connect" your UDP socket to the 
> remote side and then start sending large packets and backing off slowly, 
> the socket layer will compute the "real" MTU between two endpoints, and 
> you can obtain it through "getsockopt".  Do you know of anyone who's 
> tried this, and the results?
> 
> -david
> _______________________________________________
> p2p-hackers mailing list
> p2p-hackers at zgp.org
> http://zgp.org/mailman/listinfo/p2p-hackers
> _______________________________________________
> Here is a web page listing P2P Conferences:
> http://www.neurogrid.net/twiki/bin/view/Main/PeerToPeerConferences
> 
> 
>