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Re: SCTP?
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Re: SCTP?


  • Subject: Re: SCTP?
  • From: Peter Sichel <email@hidden>
  • Date: Thu, 29 May 2008 14:06:22 -0400

On May 29, 2008, at 10:52 AM, Jens Alfke wrote:

(One aspect I'm leery of is NAT support; I can imagine that most NATs wouldn't know what to do with it.)

I suspect many NATs are similar to mine, they would not recognize the transport protocol so would treat the packet like ICMP or IP encapsulated VPN. As long as you only needed a single exposed host or SCTP connection through your NAT, it would probably work. As soon as you fire up a second SCTP connection, the two connections would clash causing packets to be mis-delivered.


Any opinions about the protocol — is it mainstream enough to be worth using?


Adding NAT support for SCTP is complicated by the 32-bit CRC checksum used which doesn't allow incremental checksum modification. If there was any desire for future NAT support, using a standard Internet style checksum would have been a better choice. There's an awful lot of NAT gear out there that won't be upgraded anytime soon. Tunneling over UDP or getting IPv6 connectivity without NAT might be easier.

Whether it's worth using depends on who your customers are. For private in house networks or dedicated circuits, it could be fine. For widespread deployment to personal computers, probably not at this time.

Kind Regards,

- Peter

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References: 
 >SCTP? (From: Jens Alfke <email@hidden>)

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