Date: Tue, 17 Apr 2001 15:42:44 -0700 From: "Michael O'Henly" <michael@tenzo.com> To: freebsd-questions@freebsd.org Subject: Three easy questions about ipfw... Message-ID: <01041713553100.23795@h24-69-46-74.gv.shawcable.net>
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Hi...
1. If I'm running sendmail but use it for outgoing mail only, should I make
port 25 open on the external interface? For instance, would my machine need
to receive responses confirming that outgoing mail has been successfully
delivered?
2. If I describe $onet as being equal to $oip, ipfw seems to be able to
figure out the bitmask for $onet by looking at the netmask. (I know this
because I can see what $onet is expanded to when I do a 'ipfw list'.) Is this
acceptable or should I be using something like:
onet=`ifconfig rl0 | grep "inet " | awk '{print $2 "/23"}'`
3. If describing $onet as being equal to $oip _is_ acceptable, would it be
more efficient to enter it as...
onet=`ifconfig rl0 | grep "inet " | awk '{print $2}'`
omask="255.255.254.0"
oip=onet
Or better yet, to just replace all occurrences of $onet in rc.firewall with
$oip?
Thanks.
M.
--
Michael O'Henly
TENZO Design
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