Isn't the following redundant:

net            $FW             DROP            info
net            loc             DROP            info
net             all             DROP            info


in that the last rule (net all) will DROP everything and therefore the 
only additional input for this interraction would be under rules.

similarly

loc   net  ACCEPT
loc   $FW  REJECT
loc   all  REJECT

doesn't require the "loc  $FW  REJECT" line for the same reasons.

True?

Another question:
I initially tried setting up my interfaces such that:

net   eth1  detect  dhcp...
loc   eth0  detect  dhcp...

but no DHCP entry in rules.  I got a lot of blocked UDP port 53 traffic.
Where does the dhcp option come in (with the manpage instruction to 
include this) and how does that fit in with the DHCP rule.  Do they both 
need to be present?  redundant?  Or is there something else in the 
background?

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