[ale] PPP Question?? 'renew' message?

[cfowler at outpostsentinel.com (Christopher Fowler)]

       lcp-echo-failure n
              If this option is given, pppd will presume the peer to 
be  dead
              if  n  LCP  echo-requests are sent without receiving a
valid LCP
              echo-reply.  If this happens, pppd will  terminate  the 
connec-
              tion.  Use of this option requires a non-zero value for
the lcp-
              echo-interval parameter.  This option can be used to
enable pppd
              to  terminate  after  the  physical  connection  has been
broken
              (e.g., the modem has hung up) in situations  where  no 
hardware
              modem control lines are available.

       lcp-echo-interval n
              If  this  option  is  given,  pppd will send an LCP
echo-request
              frame to the peer every n seconds.   Normally  the  peer 
should
              respond  to  the  echo-request  by  sending an
echo-reply.  This
              option can be used with the lcp-echo-failure  option  to 
detect
              that the peer is no longer connected.


lcp-echo-interval 60 lcp-echo-failure 2

Send echo packet every minute terminate link after 2 failures.

On Mon, 2006-05-15 at 19:14, John Mills wrote:
> ALErs -
> 
> I need to periodically remind my PPP link that my system is still there
> and I understand the way to do this may be issuing a "renew" packet, which
> I've been told is very similar to a "request" packet, except that it
> includes the link's current assigned IP instead of a place-holder used in
> the "request" packet. The 'kick-out' interval seems to be about half an 
> hour.
> 
> I don't know if this is achieved by specifying "keep-alive" for a
> PPP link for some configuration programs, or something different.  
> Different, I think, because link termination is not supposed to be
> traffic-dependent for this environment, and in fact I get the kick-outs 
> whether I'm sending traffic or not.
> 
> If that sounds incoherent, it just reflects my clueless state. Where can I
> learn a bit more about PPP link management, and perhaps how to generate
> these magic packets? My end of the link is being managed by a conventional
> [AFAIK] ppp in a minimal 2.4 setup. What lives at the network end, I have
> no idea.
> 
> TIA for any background.
> 
>  - Mills
> 
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