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From: brian@telebit.com (Brian Lloyd)
Newsgroups: comp.dcom.lans
Subject: Re: NetBlazer
Keywords: NetBlazer
Message-ID: <1991May30.171856.14244@telebit.com>
Date: 30 May 91 17:18:56 GMT
References: <4369@zeus.sbi.com> <1991Apr6.073416.21710@telebit.com> <5731@gazette.bcm.tmc.edu>
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sob@tmc.edu (Stan Barber) writes:

>In article <1991Apr6.073416.21710@telebit.com> brian@telebit.com (Brian Lloyd) writes:
>>The NetBlazer also supports Van Jacobson's IP/TCP header
>>prediction/compresion algorithms when running SLIP or PPP.  This
>>greatly reduces latency and makes interactive activities (TELNET,
>>rlogin, rsh, etc.) more palatable.

>The documentation on this option does not say it works for PPP. I have not
>tested it on PPP, though. 

>Quote from Page 6-38

>"The ip vj command controls whether or not Van Jacobson TCP header
>compression willbe uses for a specified slip interface."

VJ header compression does work on PPP.  PPP automatically negotiates
VJ header compression support.  Unfortunately the negotiation used by
the the NetBlazer conforms to the earlier form specified in RFC1172.
The mechanism for this negotiation has been changed but the NetBlazer
has not yet been brought up to date.  This will be corrected in a
future release (sorry I can't give you a time frame yet).

If you are using PPP to connect between two NetBlazers you will get VJ
header compression by default.

-- 
Brian Lloyd, WB6RQN                              Telebit Corporation
Network Systems Architect                        1315 Chesapeake Terrace 
brian@napa.telebit.com                           Sunnyvale, CA 94089-1100
voice (408) 745-3103                             FAX (408) 734-3333