Date: Tue, 9 Apr 2002 15:56:49 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Sebastien Petit <spe@selectbourse.net> Cc: net@freebsd.org Subject: Re: Netgraph question Message-ID: <Pine.BSF.4.21.0204091545260.57350-100000@InterJet.elischer.org> In-Reply-To: <20020409213955.639A26AA8@spe.homeunix.net>
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On Wed, 10 Apr 2002, Sebastien Petit wrote: > On Tuesday 09 April 2002 22:29, Julian Elischer wrote: > > On Tue, 9 Apr 2002, Sebastien Petit wrote: > > > Ok julian, > > > > > > So I must write loadd with ng_ether for the moment and wait for ng_etf > > > include in FreeBSD 4.x. > > > I can modify my code after if ng_etf is available... > > > Last question, when I write a packet on the lower hook, must I include a > > > CRC32 field at the end of the ethernet packet ? > > > > Actually you don't need etf. As archie pointed out.. you can do your own > > filtering > > and pass anything you don't want (e.g. PPPOE) back to the > > interface.. (the the 'upper' hook (and visa versa)) > > > > I just MFC'd the etf type BTW. > > > > The HARDWARE adds and strips the CRC.. you can ignore it. > > > > > > > > also: what does `ngctl show xl0:` show? > > (while it's supposed to be connected) > > > > With tcpdump I see bad cksum 0!, so I think I must recompute ip checksum > before resending the packet. > there is an algorythm for updating the checksum if you change just one byte.... see: http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=236988+241215+/usr/local/www/db/text/1999/freebsd-hackers/19991128.freebsd-hackers > Thank you for your help julian, > > Sebastien > -- > spe@selectbourse.net > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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