Re: interoperability issue with TCP PEP

DVB-RCS, via SatLabs, is currently looking into standardizing a minimum 
interoperable PEP.  Not sure of the current status of the effort...

Keith L. Scott wrote:

>Lakshmi,
>
>It is entirely possible for PEPs made by different vendors to interoperate,
>provided the vendors implement a common standard; and yes, there _is_ a
>standard for how the information is carried across the satellite link.
>
>The Space Communications Protocol Standards: Transport Protocol (SCPS-TP,
>also sometimes referred to as TCP tranquility) defines a set of TCP options
>that can improve TCP performance in stressed environments, including
>satellite communications.  PEP products that implement these options are
>available from a number of vendors, and should interoperate if they all
>conform to the specification.  There is also a freely available reference
>implementation of the SCPS protocols that includes a PEP application that is
>available by sending mail to the point of contact listed at
>http://www.scps.org.
>
>Tranquility is completely backward-compatible with other TCP
>implementations; all of the Tranquility-specific functionality is negotiated
>during the SYN exchange.  By using different settings for the terrestrial
>and satcom sides of the PEPs, they can dramatically improve performance over
>the satcom link.  There is currently no implementation that I know of that
>does private, out-of-band signaling between the PEPs, though I can envision
>uses for such signaling.
>
>I'd be happy to answer any other questions you have or to point you at some
>vendors.
>
>The SCPS-TP protocol spec is available from
>http://www.ccsds.org/CCSDS/documents/714x0b1.pdf
>
>Best regards,
>
>		--keith
>
>
>
>
>  
>
>>-----Original Message-----
>>From: [email protected] [mailto:[email protected]] On 
>>Behalf Of Lakshmi Priya
>>Sent: Wednesday, July 28, 2004 7:42 AM
>>To: [email protected]
>>Subject: [pilc] interoperability issue with TCP PEP
>>
>>
>>hi,
>>
>>    Would it be possible to implement PEP such that it is 
>>interoperable
>>with other PEP implementations?
>>That is, in a split connection, is it possible to have 2 
>>different vendor
>>implementations running on either end of satellite link PEP 
>>nodes? Are there
>>any such implementations?
>>
>>    Since there are no standards to the way in which the end host
>>information is carried over the satlink after spoofing, I 
>>guess this would
>>not be possible. There could also exist many other proprietary control
>>packets. Any inputs in this regard is welcome.
>>
>>thanks and regards,
>>Lakshmi Priya
>>
>>
>>
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