Date: Tue, 13 Aug 1996 17:25:53 -0500 From: John Boggs <jdb@robigo.visi.com> To: freebsd-questions@freebsd.org Subject: User PPP and MTU size Message-ID: <199608132225.RAA12586@robigo.visi.com>
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I've been having trouble with initial fetching of news headers from my access provider (using GNUS). He recommended that I try different MTU sizes, but I can't find documentation on how to do this. In the handbook at one point it says: During startup the tun0 device should be detected, and two lines like the following should be printed, tun0: flags=51<UP,POINTOPOINT,RUNNING> mtu 1500 inet x.x.x.x --> y.y.y.y netmask 0xffffffff This is not the case. Obviously the tun device is there and working, because user PPP works. However, here's my entire dmesg: FreeBSD 2.1.0-RELEASE #0: Mon Aug 5 18:33:48 CDT 1996 jdb@robigo.visi.com:/usr/src/sys/compile/ROBIGO CPU: i486DX (486-class CPU) real memory = 16777216 (16384K bytes) avail memory = 15253504 (14896K bytes) Probing for devices on the ISA bus: sc0 at 0x60-0x6f irq 1 on motherboard sc0: VGA color <16 virtual consoles, flags=0x0> sio0 at 0x3f8-0x3ff irq 4 on isa sio0: type 16450 sio1 at 0x2f8-0x2ff irq 3 on isa sio1: type 16550A sio2 at 0x3e8-0x3ef irq 5 on isa sio2: type 16450 lpt0 at 0x378-0x37f irq 7 on isa lpt0: Interrupt-driven port lp0: TCP/IP capable interface fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa fdc0: NEC 765 fd0: 1.44MB 3.5in fd1: 1.2MB 5.25in wdc0 at 0x1f0-0x1f7 irq 14 on isa wdc0: unit 0 (wd0): <Conner Peripherals 1080MB - CFA1080A> wd0: 1032MB (2113776 sectors), 2097 cyls, 16 heads, 63 S/T, 512 B/S npx0 on motherboard npx0: INT 16 interface No tun device mentioned. However, from this bit of the handbook it seems that MTU is controlled by the tun device; is this true? If so, do I have to recompile the kernel to try different MTUs? -- John D. Boggs \ The great thing about human language is jdb@robigo.visi.com \ that it prevents us from sticking to \ the matter at hand. -Lewis Thomas
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