Advantages

There are  times when  using  packet filters makes  sense. If the  connections require high  throughput  or the protocols  has proprietary technology that makes  it not  compatibles with  other  firewall  technologies  a packet filtering firewall   might  be in order. Although packet  filters have limitations they  also have the followings  advantage over other  firewall  technologies.

a.Compatibility packet  filters  do not modify the packet stream so they works with any  protocols.

b.Performance packet filters are very fast since they look only at the headers.

c.Scalability since  packets  filters are simple  it is easy to scale the solution.