setTrafficClass on server socket; IP_TOS replacement on Windows

Alan Bateman Alan.Bateman at Sun.COM
Fri May 15 08:21:29 UTC 2009

Esmond Pitt FACS wrote:
> Alan
> 1. I've just come across a situation where a user needs to call
> setTrafficClass on a server socket, so that a certain TOS value will be
> present in the ACK packet when TCP accepts a connection. This would occur
> automatically because all socket flags are inherited during construction of
> the native socket on the backlog queue, then Java turns off the timeout
> setting when it constructs a Socket around it during accept() (which is
> another historical curiousity AFAICS).
> I can't find my link to the NIO2 documentation but is there way to do that
> in NIO2? Generally speaking it should be possible to (pre)-set every socket
> option on a server socket.
> The user situation itself is more or less nonsense, a brain-dead router
> configuration that rejects ACKs without a certain non-zero TOS setting, so
> writing real applications behind it is more or less impossible, especially
> since our friends in Seattle don't support IP_TOS anyway, but regardless of
> that the principle still applies.
> 2. While on that topic, is there support for whatever Microsoft's
> replacement API for IP_TOS in NIO2?
Esmond - you can re-send this to net-dev?


More information about the discuss mailing list