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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