"use the DNS servers from the VPN" does NOT imply: "ignore the local DNS
servers". Why would it? In *your* case the local DNS servers become
unreachable, but not in mine. So in my case it is the command line
client which is "buggy"

It is expected for some DNS servers to be not responsive: this is
exactly why several of them should be configured.

This more and more looks like a glibc problem, not really related to NM. It is 
hard to ask NM to try to work around every limitation of the resolver in glibc. 
Suppose for a second that the resolver in glibc were to:
- re-read any change to resolv.conf immediately
- support more than 3 servers
- query all of them simultaneously and return as soon as it gets an answer
... then would you still have a problem? Looks like not!

If you find glibc resolver too limited, then try dnsmasq or an
alternative resolver as you were suggested?

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https://bugs.launchpad.net/bugs/651007

Title:
  Does not correctly write resolv.conf

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