ipfw question

[Peter Pentchev]

On Thu, Mar 04, 2004 at 09:24:40PM -0500, David Edwards wrote:
> Hello folks.. I have a quick question ipfw in a 4.8 server..
> 
> In /etc/rc.conf, if you set this - firewall_type="OPEN", is it also
> necessary for this options IPFIREWALL_DEFAULT_TO_ACCEPT in the kernel config
> file?

No, firewall_type="open" will work even without the default-to-accept
kernel config option.

The presence or absence of the kernel configuration option determines
what rule 65535 will be at startup: at the initialization of the ipfw
framework, it places a rule numbered 65535, which is either 'allow' if
the option is present, or 'deny' if it is not.  The firewall_type="open"
rc.conf knob determines the behavior of the /etc/rc.firewall script
(which can be overridden by setting firewall_script="something else" in
/etc/rc.conf) - and rc.firewall's 'open' mode creates a rule numbered
65000.  Since ipfw terminates the rule search on the first match, rule
65000 will be processed before rule 65535, and the kernel's default will
never be considered - firewall_type="open" trumps the presence or
absence of the IPFIREWALL_DEFAULT_TO_ACCEPT option.

G'luck,
Peter

-- 
Peter Pentchev	roam at ringlet.net    roam at sbnd.net    roam at FreeBSD.org
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If this sentence were in Chinese, it would say something else.
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