Date: Sat, 7 Sep 2002 17:01:40 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Robert Tan <tar@transfer.nl> Cc: "freebsd-questions@FreeBSD. ORG" <freebsd-questions@FreeBSD.ORG> Subject: Re: tcpdump VJC Message-ID: <20020907160140.GA274@happy-idiot-talk.infracaninophi> In-Reply-To: <DPEDIFKGFNJACMLKGOEGKELPCDAA.tar@transfer.nl> References: <DPEDIFKGFNJACMLKGOEGKELPCDAA.tar@transfer.nl>
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On Sat, Sep 07, 2002 at 01:06:48PM +0200, Robert Tan wrote: > What does the following tcpdump show: > > 13:02:36.121981 VJNC 103: > 13:02:36.122835 VJC 22: > 13:02:36.192492 VJC 12: > 13:02:36.199864 VJC 49: > 13:02:36.200565 VJC 26: > 13:02:36.288607 VJC 9: > 13:02:36.377856 VJC 38: > 13:02:36.378595 VJC 18: > 13:02:36.445868 VJC 22: > 13:02:36.446576 VJC 18: > 13:02:36.529103 VJC 103: > 13:02:36.530225 VJC 20: > 13:02:36.778853 VJC 1033: > 13:02:36.909851 VJC 1031: > 13:02:36.911865 VJC 13: > 13:02:37.039852 VJC 1031: > 13:02:37.169483 VJC 1031: > 13:02:37.171447 VJC 11: > 13:02:37.298975 VJC 1031: > 13:02:37.428347 VJC 1031: > 13:02:37.430320 VJC 11: > 13:02:37.557605 VJC 1031: > 13:02:37.691854 VJNC 1068: > 13:02:37.693839 VJC 14: > 13:02:37.822226 VJC 1034: VJC is Van Jacobsen Compressed TCP/IP traffic, VJNC is Van Jacobson Uncompressed TCP/IP traffic, both passing over a PPP connection. It's a method of optimizing traffic over slow links by eliding redundant portions of packet headers -- hence you often see it refered to as "Van Jacobsen Header Compression". Far more detail than you ever wanted to know my be obtained at http://www.faqs.org/rfcs/rfc1144.html Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks Savill Way Marlow Tel: +44 1628 476614 Bucks., SL7 1TH UK To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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