2008/8/19 Hinko Kocevar <[EMAIL PROTECTED]>:
> Hi,
>
> Is there a way to tell if iptables (firewall) is active from some
> /proc or /sys file? Or with iptables utility?
>
> It is safe to assume if no rules are present in any of the chains
> that firewall is inactive/disabled?

I agree with other posters that checking whether iptables module is
loaded or not is the best way to check.

Mind you, iptables -L only check "filter" chain. You also need to
iterate over "nat" and "mangle" table too to make sure no rules is
defined there.

The word "active" has double meaning IMHO. iptables...as far the hook
mechanism is concerned, is always active i.e the function pointer is
checked...if it's not null then something must be done inside iptables
code flow. the real point here is whether the iptables hook is calling
the filtering/nat/mangling function or not.

regards,

Mulyadi.

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