Thank You for Your time and answer, Javier:

> Did you try to use your iptable script in post-up / pre-down hooks at
> /etc/network/interfaces ? I think it is the best solution for that

But I have to disagree w/ You - for once the network environment
changes that is, say the machine will be out of a net, then the file
running will cease on the interface initialization (or whatever) that
will end up with not started firewall at all - that can be dangerous in
cases of:

a) there are rules for internal programs communications (that is within
the machine);

b) if a modem connection will be istablished - the machine will be just
uncovered for the net (?Internet).

Personally, I advice the topic author to make a script, make it
running from some /etc/rcN.d, having small number after S. - Then the
firewall will be launched independently on what the current network
environment is. Disadvantage is there is a time between actual
interface initialization moment and the moment the iptables rules are
applied.

Please, correct me, if I'm wrong.


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