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Subject: DHCP with ipfw
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/etc/rc.conf:

  ifconfig_rl0="DHCP"

  firewall_type="client"
  firewall_enable="YES"

When my machine boots firewall is initialized before DHCP obtains IP
address.  This results in incomplete firewall configuration.  How do I
fix this?

My /etc/rc.firewall initialized with the following commands:

  net=`ifconfig rl0 | grep "inet " | awk '{print $6}'`
  mask="255.255.255.0"
  ip=`ifconfig rl0 | grep "inet " | awk '{print $2}'`