Date: Thu, 14 Dec 1995 18:03:01 -0500 (EST) From: "Stephen F. Combs" <combssf@salem.ge.com> To: combssf@salem.ge.com, archie@tribe.com Cc: questions@freebsd.org Subject: Re: MTU/MRU in 'User Mode' PPP??? Message-ID: <199512142303.SAA25758@combs.salem.ge.com>
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Sorry, I wasn't explicit enough in my original message. I wanted to set the MTU/MRU DOWN (to 552 to be exact). I've already discovered my mistake (I didn't look FAR enough, I only looked in the handbook and the man page, I didn't look in the program itself!) 'set mru 552' should work just fine! I'll try it tonite! (I'm also going to look at putting 'Predicter-1(sp?)' compression in the kernel mode ppp as well). Thanks for the response. As an aside, to the entire FreeBSD team, Thanks for the work! I LIKE FreeBSD (been running it since before 1.0R, justabout since FreeBSD began existance). I've even convinced my bosses that it makes sense for some applications here at GEDS/GEMIS. We're using it as the DNS (BIND) server for GE Motors in Ft. Wayne and (after the first of the year) will be using it as an intermediate print-spooler controller in Mebane, NC and Patilla, Puerto Rico. It GREATLY speeds up printing from an IBM Mainframe to HP JetDirect Cards and Castille PrintServer boxes (just define various spooler queues on the FreeBSD box which point to the various JetDirect and Castille printers and then define the queue on the FreeBSD box as the print queue on the IBM. This is using IBM's TCP/IP and LPR/LPD s/w). 'Tis a H*** of a lot cheaper than putting 3174's and IBM printers (with the required EXPENSIVE channel extenders, etc.......) at each remote site. We'll also be deploying these systems to quite a few remote (in some cases, quite remote, i.e. Bejing, China, Monterrey(sp?) Mexico, Singapore, China, Shanghai, etc......) as print spoolers, BIND servers, Internet E-Mail gateways, etc.... I've already told the boss(es) they'll have to buy a subscription to the CD-ROM after the first of the year (typical GE end-of-year purchasing crunch!)..... Steve Combs Communications Specialist Network Services GEDS/GEMIS Salem, VA CombsSF@Salem.GE.COM > From archie@tribe.com Thu Dec 14 17:48:40 1995 > From: Archie Cobbs <archie@tribe.com> > Subject: Re: MTU/MRU in 'User Mode' PPP??? > To: combssf@salem.ge.com (Stephen F. Combs) > Date: Thu, 14 Dec 1995 14:47:37 -0800 (PST) > Cc: questions@freebsd.org > In-Reply-To: <199512142024.PAA25229@combs.salem.ge.com> from "Stephen F. Combs" at Dec 14, 95 03:24:44 pm > X-Mailer: ELM [version 2.4 PL24] > Mime-Version: 1.0 > Content-Type> : > text/plain> ; > charset=US-ASCII> > Content-Transfer-Encoding: 7bit > Content-Length: 847 > > > > Is there any way to set the MTU(Max Transmission Unit[Size]) and/or MRU > > (Max Receive Unit[Size]) on the 'tun' device for 'User Mode' PPP (ijppp??)? > > > > These 1500byte MTU/MRU sizes are killing me.... > > > > Kernel Mode PPP allows this, but I haven't seen anything on MTU/MRU with > > User Mode.....(and yes, I did look!). > > I'm not 100% certain about this, but I believe you must recompile the > kernel with a higher setting of the value for TUNMTU, defined in the > header file "/usr/src/sys/net/if_tun.h" in order to pass > 1500 byte > packets to the tunnel interface. > > Then say "set mru 1800" or whatever to ppp. Also check out the definitions > in "/usr/src/usr.sbin/ppp/hdlc.h". > > -Archie > > _______________________________________________________________________________ > Archie L. Cobbs, archie@tribe.com * Tribe Computer Works http://www.tribe.com >
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