Re: SCTP?
Re: SCTP?
- Subject: Re: SCTP?
- From: james woodyatt <email@hidden>
- Date: Thu, 29 May 2008 10:36:47 -0700
On May 29, 2008, at 07:52, Jens Alfke wrote:
Does anyone know its status on Mac?
It's not in the OS.
Any 3rd party implementations?
There might be a userland implementation. I don't know.
Any opinions about the protocol — is it mainstream enough to be
worth using? (One aspect I'm leery of is NAT support; I can imagine
that most NATs wouldn't know what to do with it.)
I'm not aware of any NAT implementation, commercial or free, that
supports stateful translations of SCTP flows. (It's expensive to do,
since the headers don't use checksums for integrity protection, i.e.
the NAT has to recalculate the CRC by iterating over the whole payload
when it changes the headers.)
Don't expect IPv6 to be much help here either, unless you want to turn
off your stateful packet filter and run without a firewall. There
aren't any IPv6 firewalls that can track SCTP flow states. (AirPort
treats SCTP as an unknown upper layer header and tracks it with a 3-
tuple of the source and destination IP addresses and the SCTP protocol
number. Its state timeouts are not tuned specifically for SCTP, so it
might present an unacceptable intrusion on network transparency.)
All this is *also* true about DCCP, the other "new" transport protocol.
The Internet hourglass is rapidly becoming IPv4/TCP port 80. Get used
to it.
--
james woodyatt <email@hidden>
member of technical staff, communications engineering
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