- modify all spd entries for tunneling between a mobile node and a home   agent.  this is needed when we want to encrypt all the tunneled traffic   between MN and HA.
- modify all spd entries for tunneling between a mobile node and a home
  agent.  this is needed when we want to encrypt all the tunneled traffic
  between MN and HA.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame