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Re(2): configd and ppp
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Re(2): configd and ppp


  • Subject: Re(2): configd and ppp
  • From: "Peter Lovell" <email@hidden>
  • Date: Wed, 26 Feb 2003 00:09:07 -0500

>At 13:20 -0500 21/2/03, Peter Lovell wrote:
>>I have a puzzle with regard to "configd" daemon and PPP. It works OK - no
>>problem there - but there's a puzzling piece I need to understand better.
>>
>>When PPP is dialed-up (using standard Apple internal modem) there's a UDP
>>socket generated by configd once each second. I don't yet have details on
>>what data, if any, might be sent or received and I'm about to look into
>>that. But it creates and closes the socket once each second.
>>
>>[...]
>>
>>Any ideas, anyone??
>
>Looking through the PPP source, one obvious place where this might be
>coming from is the PPP stats ioctl. If you issue a PPP_STATUS
>request to PPP, it gets the stats by opening a UDP socket and sending
>a SIOCGPPPSTATS ioctl to it. See the ppp_status function in the
>following file.
>
><http://www.opensource.apple.com/cgi-bin/registered/cvs/src/live/ppp/
>Controller/ppp_command.c?rev=1.21&content-type=text/x-cvsweb-markup>
>
>S+E
>--
>Quinn "The Eskimo!" <http://www.apple.com/developer/>
>Apple Developer Technical Support * Networking, Communications, Hardware


Well, curiouser and curiouser.

The one-per-second sockets don't actually do anything. And they're
created by configd rather than pppd, even though this only happens when
ppp is active.

Each second, I see
socreate
soreserve
socontrol
soclose
sofree

There's also activity to port 5353 which I remember being the Rendezvous
port (mDNSResponder), but it's not the once-per-second. It's on a
different socket and is not related at all.

The sockets are created by configd (I dump the pid at socreate) and not
pppd, which is puzzling. I guess I'll just have to start thwacking my way
through sources to find what might be the cause.

Regards.....Peter
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  • Follow-Ups:
    • Re: Re(2): configd and ppp
      • From: Allan Nathanson <email@hidden>
References: 
 >Re: configd and ppp (From: Quinn <email@hidden>)

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