dougm@violet.ICO.ISC.COM ("Doug McCallum") (09/20/88)
In reply to your message of Fri, 16 Sep 88 15:56:19 EDT ------- > 1) Anyone using IP over 802.2 LLC or 802.3 MAC layers in commerical or > academic products? (Commercial folks are interested in having their > products conform to "standards"). I don't know if it is in very wide use, but there are a number of vendors that support it as an option. > 2) What is ATT's streams used for: like Berkeley's sockets, to provide > access to protocol families? Is there a "native" streams protocol or > protocol suite? And more concrete: just like TCP/IP is being or will be > delivered with streams, are there other protocol suits available > (commerically or otherwise) with a streams interface?, say ISO's? AT&T STREAMS is a framework in which to implement communications protocols. There is no native Streams protocol. That is, with a generic base system you get no communications protocols, just the tools to implement them. TLI is the AT&T equivalent to sockets in the V.3 environment. There has been much discussion about TLI vs. sockets in this group in the past so I won't get into that. There are a number of protocol suites available. A number of vendors have TCP/IP implementations. There are also ISO and XNS implementations that I know of plus some others proprietary to various vendors.
bae@unisoft.UUCP (Hwa Jin Bae) (09/27/88)
> 1) Anyone using IP over 802.2 LLC or 802.3 MAC layers in commerical or > academic products? (Commercial folks are interested in having their > products conform to "standards"). There are a few such products including one from us. Usually it is done by using a 802.2 LLC header with DSAP and SSAP value 170 and Control value 3 (unnumbered info.) along with a SNAP header to indicate ethernet type field since the 802.3 doesn't have a type field, with Protocol Id equal to 0. > 2) What is ATT's streams used for: like Berkeley's sockets, to provide > access to protocol families? Is there a "native" streams protocol or > protocol suite? And more concrete: just like TCP/IP is being or will be > delivered with streams, are there other protocol suits available > (commerically or otherwise) with a streams interface?, say ISO's? STREAMS provides a general environment to implement a networking protocol or device drivers. Several implementations use STREAMS different ways to implement TCP/IP. Some are straight ports of 4.3 BSD TCP/IP with additional code for multiplexing modules at TCP and IP levels. At LLC level these implementations usually use another module that understand M_PROTO messages of various kinds that sort of simulates (implements) 802.2 like services to be used by upper layer module (IP multiplexor). Others (like ours) work different way but in general STREAMS implementations do try to follow the "standard" stacks as closely as possible for better or worse. There are some interesting issues involved in optimizing flow control algorithms with STREAMS based protocol implementations. /hjb -- I only speak for myself. Hwa Jin Bae bae@tis.llnl.gov (Internet) UniSoft bae@unisoft.UniSoft (smail uucp) Emeryville, CA ...!uunet!unisoft!bae (plain uucp)