[ale] PPP/DHCP conflict

[Jim Kinney]

Looks like the dhcp lease was expired and not able to renew. But there was a
process that was still running with routes in place. Thus data coming in
even though the IP was expired. A tcpdump on the ppp link would tell more.

On Sat, Nov 27, 2010 at 7:55 PM, John Mills <johnmills at speakeasy.net> wrote:

> ALErs -
>
> This afternoon I noticed that response of my dial-in PPP link had nearly
> stopped while the data-rate log showed that my incoming link was running
> almost 100% saturated even though I couldn't identify any task that
> should have been pulling tons (well, pounds anyway) of incoming traffic. I
> notice a number of log messages to the effect:
>
> Nov 27 07:57:34 muskrat dhcpcd[3140]: eth0: lease expired 342002 seconds
> ago
> Nov 27 07:57:34 muskrat dhcpcd[3140]: eth0: broadcasting for a lease
> Nov 27 07:57:54 muskrat dhcpcd[3140]: eth0: timed out
> Nov 27 07:57:54 muskrat dhcpcd[3140]: eth0: trying to use old lease in
> `/var/lib/dhcpcd/dhcpcd-eth0.info'
> Nov 27 07:57:54 muskrat dhcpcd[3140]: eth0: lease expired 342022 seconds
> ago
> Nov 27 07:57:54 muskrat dhcpcd[3140]: eth0: broadcasting for a lease
> Nov 27 07:58:14 muskrat dhcpcd[3140]: eth0: timed out
> Nov 27 07:58:14 muskrat dhcpcd[3140]: eth0: trying to use old lease in
> `/var/lib/dhcpcd/dhcpcd-eth0.info'
> Nov 27 07:58:14 muskrat dhcpcd[3140]: eth0: lease expired 342042 seconds
> ago
> Nov 27 07:58:14 muskrat dhcpcd[3140]: eth0: broadcasting for a lease
> Nov 27 07:58:34 muskrat dhcpcd[3140]: eth0: timed out
> Nov 27 07:58:34 muskrat dhcpcd[3140]: eth0: trying to use old lease in
> `/var/lib/dhcpcd/dhcpcd-eth0.info'
>
> I don't know if 'dhcpcd' trying to get an address lease actually accounted
> for the high level of inbound traffic, but it does seem funny that my
> system was trying to obtain a DHCP lease when the connection is over PPP.
> Of course if the system were plugged into a 'live' ethernet LAN, I would
> expect it to obtain an IP address (and a lease) over the wired link;
> that's a good enough reason for the 'dhcpcd' activity I suppose.
>
> At the moment the log messages are posting about every 20 seconds and the
> inbound and outbound data is inermittent and slow (separated peaks of
> approx. 150 B/s). When the link was saturated the outbound rate was 10-100
> B/s while inbound rate was hammered at about 2.9 KB/s. Log messages for
> an activity repeated every 20 seconds doesn't explain that!
>
> The system is running opensuse-11.1 with the KDE desktop. The PPP
> connection is _via_ an external US Robotics modem seen through a
> USB->serial adapter.
>
> Could someone please explain what I'm seeing and how to stop it if it's a
> problem? Likewise suggestions for debugging if I find I'm in the same
> situation again would be helpful.
>
> TIA.
>  - Mills
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-- 
-- 
James P. Kinney III
I would rather stumble along in freedom than walk effortlessly in chains.
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