Alun Jones <alun@texis.com> wrote: > >Not necessarily. Have you heard of T/TCP? Before that was around, I >remember hearing discussion of using a packet with SYN, FIN, and data all >in one, to cut down on round-trips in really short communications, while >still providing reliability. One of the problems with T/TCP on the wider Internet is that it is almost as vulnerable to source address spoofing as UDP, so security facilities like those provided by tcp_wrappers (and built in to many daemons) are no longer so effective. With vanilla TCP, the T/TCP combination of SYN+ data+FIN isn't useful, because the passive end should discard data that arrives before the handshake is completed in order to preserve its spoof- resistence, therefore requiring a retransmit. Tony. -- f.a.n.finch <dot@dotat.at> http://dotat.at/ FORTIES CROMARTY FORTH TYNE DOGGER: NORTHWESTERLY 4 OR 5, OCCASIONALLY 6. SHOWERS. GOOD.
