title: Equivalent commands for (ipfw) in OS X taken from (iptables)
body: <p>I was using it on my DD-WRT router. I need to increase incoming/outgoing TTL from 1 to 128. How to use this commands in OS X using (ipfw)?</p>
  
  <p><code>iptables -t mangle -I PREROUTING -i `get_wanface` -j TTL --ttl-set 128</code></p>
  
  <p><code>iptables -t mangle -I POSTROUTING -o `get_wanface` -j TTL --ttl-set 128</code></p>