[2276] in RedHat Linux List
Re: Bug or brain-fade?
daemon@ATHENA.MIT.EDU (Kyle Ferrio)
Fri Nov 1 21:24:15 1996
Date: Fri, 1 Nov 1996 21:22:08 -0500 (EST)
From: Kyle Ferrio <kbf@phy.duke.edu>
To: redhat-list@redhat.com
In-Reply-To: <Pine.BSF.3.95.961101193529.16720A-100000@Jupiter.Mcs.Net>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
On Fri, 1 Nov 1996, Mark Gleaves wrote:
> Is this a bug in RH4.0 or just lack of understanding on my part?
>
> In /etc/sysconfig/network-scripts/ifup-ppp I see the following:
>
> if [ "${ESCAPECHARS}" = yes ] ; then
> opts="$opts asyncmap 00000000"
> fi
>
> Shouldn't the comparison be "!=" ? I.e., if $ESCAPECHARS is yes, then
> don't supply an asyncmap and use the default pppd behavior, which is to
> escape just about everything.
I was just wondering about the "polarity" of $ESCAPECHARS myself. A check
of the pppd manpage reveals that null and 0 asyncmaps are not synonymous,
if I understood. A 0 prodeces an identity mapping, which is an
affirmation that all controls can be successfully received over the entire
link, from your ISP to you. A null on the other hand means that -no-
mapping will be performed. From the client side, these may seem like the
same thing. But a properly configured server should understand the
difference. If the client specifies 0, the server assumes that the
downlink is a clear channel for controls. But if the client specifies
null, the server should assume the worst and escape all controls.
So the interpretation of the Redhat $ESCAPECHARS is that "yes" means that
the channel is clear to controls. Anything else means null, which in
turn means that the downlink may not be clear, and the server should escape
all controls.
Somebody correct me if I'm off here.
> And while I'm on the subject, did anybody else have a problem with a modem
> initialization string of AT&F1 ? The ampersand seriously confused the
> shell script...
Where is that? chat-ppp0? I don't see that init string anyplace on my
system.
Kyle Ferrio
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