I just stumbled across Debian bug report #367715 which has the following
title.
ppp: overwrites /etc/resolv.conf despite "usepeerdns" being unset
The report says about Debian ppp 2.4.4b1-1 that
pppd sets the environment variable USEPEERDNS regardless
of the option 'usepeerdns' being set or unset in a peer's
configuration file.
In that package, /etc/ppp/ip-up.d/0000usepeerdns already contained '[
"$USEPEERDNS" ] || exit 0'.
If the ppp package hasn't been fixed since then, then to check that
usepeerdns is set it won't suffice to check for "$USEPEERDNS" being
nonempty.
William McCall: Can you please test with the current version of the ppp
package? If you put
[ "$USEPEERDNS" ] || exit 0
near the top of /etc/ppp/ip-up.d/000resolvconf does that suffice to
prevent the malfunction that you reported? Or does it have to be
[ "$USEPEERDNS" = 1 ] || exit 0
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https://bugs.launchpad.net/bugs/1085756
Title:
/etc/ppp/ip-up.d/000resolvconf doesn't check if envvar USEPEERDNS is
set
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