Date: Sun, 8 Sep 2002 09:35:05 +0200 From: "Robert Tan" <tar@transfer.nl> To: "Matthew Seaman" <m.seaman@infracaninophile.co.uk> Cc: "freebsd-questions@FreeBSD. ORG" <freebsd-questions@FreeBSD.ORG> Subject: RE: tcpdump VJC Message-ID: <DPEDIFKGFNJACMLKGOEGKEMOCDAA.tar@transfer.nl> In-Reply-To: <20020907160140.GA274@happy-idiot-talk.infracaninophi>
next in thread | previous in thread | raw e-mail | index | archive | help
Tnx, But what kind of traffic is it. The reason for asking is that I've configured my isdn connection, to the internet, to hang up after a given amount of time, when there is no traffic over the link. So my connection is not closing, and I'm assuming because of the VJC stuff. Where does it come from? > -----Original Message----- > From: owner-freebsd-questions@FreeBSD.ORG > [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Matthew Seaman > Sent: Saturday, September 07, 2002 6:02 PM > To: Robert Tan > Cc: freebsd-questions@FreeBSD. ORG > Subject: Re: tcpdump VJC > > > 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?DPEDIFKGFNJACMLKGOEGKEMOCDAA.tar>