On Wed, 3 Mar 1999, Jonathan Walther wrote:
|For the second time in a couple of months, I have had a problem retreiving a
|mail message from this list that contains the modem commands to switch to data
|mode and hang up the phone. The command in question involves three plus signs
|followed by ATZ. (I don't list the command here explicitly for fear that the
|problem will recur.)
|
|When I try to retrieve the message from my POP-3 mailbox on my ISP's machine, my
|connection to the ISP is broken. I had a friend put the same message on our
|website, and when I tried to 'get' the document, my connection was broken again.
|
|I dial into my ISP using my Linux box (Redhat 4.2).
|
|It seems for all the world that the modem at my ISP is intercepting the three
|pluses, going to command mode, and then hanging up, but I cannot tell exactly
|which side is hanging up.
|
|All things being the same, it seems unlikely to me that my ISP is so messed up
|that you can't send a string containing three plus signs through it. On the
It certainly seems that it can, you're experiencing a hangup. I don't know
of any special provisions in MTAs for handling three pluses. Anyone else?
I had a similar problem when I tried to *answer* a post containing 3 pluses
with leafnode's fetch and promptly killed the connection. More than once
before I finally realized what was happening.
|other hand, I can't figure out how my Linux box might be causing the problem,
|since it seems equally unlikely that my modem is scanning incoming data looking
|for commands...
|
|I have read the relevent Linus-PPP documentation and have tried using the
|'escape' keyword to escape the "Z" character (since you can't escape the plus
|sign, and asyncmap is for control characters only), but this seems to have no
|impact other than generating an error message: "ioctl(set extended ACCM):
|Invalid argument"
The characters must be specified with hex number. The Z would be hex 5A
but I don't see why you shouldn't be able to escape the "+" with it's hex
equivalent 2B, i.e., "escape 2B". Check "man pppd".
As far as the three plus problem, it probably varies with the brand of
modem.
---
Clifford Kite Not a guru. (tm)
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