Well, the old (command line) style ifup/down tools usually run four
different types of scripts in /etc/network:

if-pre-up, if-up, if-down, if-post-down , which makes sense since
several tasks need to be done before taking the interface up or after
putting it down. e.g. Firewall configuration, traffic counters etc.

Network Manager tries to mimic that but only has two phases, up and
down. The other two important phases are missing.

Furthermore, Network Manager does not pass the usual and required
information as environment variables to the scripts to be run. E.g.
network name, other configuration parameters, DHCP parameters given by
the DHCP server (such as DNS configuration) are not passed down to the
scripts.

Network Manager is rather incomplete work and does not yet fit into the
ubuntu/debian framework.

regards
Hadmut

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the way networkmanager stores and passes network information
https://bugs.launchpad.net/bugs/364460
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