Re: PPP MTU cannot be set in 3.3.2b3/4?

NEXUS SUPPORT (mlist@nexus.net.au)
Thu, 27 Jun 1996 23:51:42 +1000

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>Date: Thu, 27 Jun 1996 23:51:05 +1000
>To: dlc@silcom.com (David Carmean)
>From: NEXUS SUPPORT <mlist@nexus.net.au>
>Subject: Re: PPP MTU cannot be set in 3.3.2b3/4?
>Cc:
>Bcc:
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>
>>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.
>
>
>
>/*MZ pointed this out to me some time ago*/ Mtu cant be forced to a particular value with pap/chap (pm fits with rfc on this) unless user uses a script to connect. Just ask the users to set a lower mtu. In win95 it is a real pain..
>
>
>

Chris

--------------------------------------------------------------------------------
Chris Pivec
Nexus Internet Australia
Voice: +61 3 93471455, Fax +61 3 98792866
mailto:chris@nexus.net.au or mailto:postmaster@nexus.net.au
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Maybe in reply to: David Carmean: "PPP MTU cannot be set in 3.3.2b3/4?"