From: presotto@plan9.bell-labs.com
To: 9fans@cse.psu.edu
Subject: Re: [9fans] rudp
Date: Sun, 9 Sep 2001 21:46:04 -0400 [thread overview]
Message-ID: <20010910014607.248C4199D5@mail.cse.psu.edu> (raw)
An rudp channel really is a datagram channel. Packets are
separately addressed by the user program so that one fd
can be used to maintain conversations with multiple other
end points. IL is one to one.
IL does have flow control, Rudp doesn't.
Rudp has no keep alive, IL does.
IL does some small amount of congestion control by measuring the
bandwidth delay product of the connection, Rudp doesn't care.
Rudp connections don't hangup when one of the sides reboots, it
just flushes any undelievered messages to that side (and the side(s)
that stays up can know that there was a restart by looking at the error
file).
We used rudp as the protocol between things like controllers
and devices that they control. For example, between a switch
and a switch controller in a telephony product.
Rudp is just udp with a some extra bytes. It was originally
done as an option on udp and we later just made it a
separate protocol. It's protocol number is not registered
witn IANA.
next reply other threads:[~2001-09-10 1:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-10 1:46 presotto [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-04-15 16:55 andrey mirtchovski
2002-04-15 15:31 rog
2002-04-15 15:21 Russ Cox
2002-04-15 14:58 andrey mirtchovski
2001-09-08 17:52 bwc
[not found] <ehg@research.bell-labs.com>
2001-09-08 16:59 ` Eric Grosse
2001-09-10 1:33 ` Scott Schwartz
2001-09-10 18:58 ` Boyd Roberts
2001-09-08 15:48 Sam
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