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Article #711

Re: stop UDP from bringing up SLIP?

#711
From: Louis A. Mamakos
Date: Thu, 13 Aug 1992 15:58
29 lines
2143 bytes
In article <1992Aug10.134954.266402@cs.cmu.edu> beatty@sqhilton.pc.cs.cmu.edu (Derek Beatty) writes:
>I'm using Mamakos' 920802 version of Dialupip to connect to campus through  
>a Cisco ASM/3.  (So my default route points to this link.)  I'd like to  
>stop SBook from bringing up the link, so I tried removing the word "udp"  
>from the "protocols" line of my ".access" file. I thought this would  
>suffice.  But now authough when I launch SBook a message like:
>Aug  7 18:23:09 sqhilton tcldiald[115]: Unauthorized protocol UDP (17)
>is logged via the syslog facility, as I expect, subsequent attempts to  
>open TCP connections seem not to bring up the link automatically; instead,  
>I have to use the duioctl to bring it up by hand. 

I think that I understand what is going one.  You have stumbled onto a
bug that goes something like this:

When an attempt is made to transmit a packet, a message is sent from
the kernel driver to the tcldiald process.  The SLIP interface is
marked as "bring-up in progress".  This prevents further messages from
being sent to the tcldiald process.  A timer is also started, by
default it is 5 minutes.  If nothing happens by then, then the
interface is cleared (actually, it may get disabled.. I'll have to
check).

In any case, since tcldiald refuses to bring up the link because its
not the right packet type, it ignores it and moves on.  It really
ought to reset the state of the interface and wait for further
attempts.  I will look at how difficult it might be to fix this to do
the right thing.

louie
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Message-ID: <1992Aug13.155833.18220@ni.umd.edu>
Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!swrinde!mips!darwin.sura.net!haven.umd.edu!ni.umd.edu!sayshell.umd.edu!louie
References: <1992Aug10.134954.266402@cs.cmu.edu>

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From: louie@sayshell.umd.edu (Louis A. Mamakos)
Newsgroups: comp.sys.next.sysadmin
Subject: Re: stop UDP from bringing up SLIP?
Keywords: SLIP, 920802, UDP, access
Message-ID: <1992Aug13.155833.18220@ni.umd.edu>
Date: 13 Aug 92 15:58:33 GMT
References: <1992Aug10.134954.266402@cs.cmu.edu>
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