Red Hat Bugzilla – Bug 79676
boot freezes at starting ppp0 when ppp DEMAND=yes
Last modified: 2014-03-16 22:32:59 EDT
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Description of problem:
In spite of ppp-watch changelog entries regarding 30 second timeout waiting for
ppp interface to start, ppp-watch does not timeout, does not detach, until
packets are received which trigger dial-on-demand.
This causes the boot sequence to freeze for an arbitrarily long time (traffic
Steps to Reproduce:
1.Configure DEMAND=yes and ONBOOT=yes in ifcfg-ppp0
Actual Results: System freezes at starting interface ppp0 until a packet is
seen that triggers dial-on-demand to dial. On a standalone system that could be
forever. On a gateway another host can be used to trigger a dial.
Expected Results: Interface ppp0 start should complete almost immediately.
DEMAND mode merely implies it is monitoring for demand, not dialling
immediately, so we should not wait for it.
This problem exists in RH 7.x also.
Created attachment 88735 [details]
A tidy avoidance of this bug.
This patch to ifup-ppp handles the DEMAND option intelligently to induce
The ideal solution might be fixing ppp-watch to be DEMAND aware instead.
I believe this is fixed differently in 7.03-1.