PPP MTU cannot be set in 3.3.2b3/4?

David Carmean (dlc@silcom.com)
Thu, 27 Jun 1996 03:00:00 -0700 (PDT)

I upgraded all six of my Portmasters to ComOS 3.3.2b3/4 a week or so ago.

Except for the idle-timouts, I thought everything was OK. Now, however, I'm
getting reports of weird behavior like some IP services working fine, like
DNS, but others not, like HTTP and POPmail. Ptrace shows the transfer
begin but then bog down. This was sounding like the old
"MTU-too-large, don't-know-why-but-reducing-it-fixes-it problem".

But I can't! It only seems to be changed when *negotiated*, but I can't set
it from RADIUS or from the user table.

When a connection is established, ifconfig always shows mtu = 1500.
"showing" the port shows that the MTU that I *wanted* appears under the
"Default Configuration" column, but the "Active Configuration" is always
1500.

OK, well not *always*...some users have different MTU, and I have even seen
two pick up the MTU I had set in RADIUS. But I definitely can't make it
work with Win95.

Any clues/help? I'm tired of parsing the PPP setup packets by hand :o(
And I've had bad luck downgrading back to 3.3.1c (read: had to netboot).

Where's Bill Simpson when you need him?

-- 
David Carmean		WB6YZM		DC574		<dlc@silcom.com>
	System/Network Administration, Silicon Beach Communications
Unsolicited commercial e-mail not accepted.  Violators will be prosecuted.