21. Routing

For routing you need to:

• Determine class of IP address and IANA network
• Apply netmasks to address (internal)
• Remove reserved numbers

Differences between Static and Dynamic Routing

1. Static Routing
   • Pre-planned, fixed

   Default Routing

   • Pro - requires no software, and is easy
   • Against – Only default entries allowed (to setup you need /etc/defaultrouter which contains names or IP’s of routers on your segment)

   Custom Tables

   • Pro – Exactly how you like
   • Against – (a) No way to do automatically in operating system, you need to make a script (b) to setup remove in.routed and in.rdisc (in /etc/rc2.d/s69inet) and add route commands (i.e. route add)
2. Dynamic Routing
   • Happens on the fly
   • The networking protocol adjusts automatically for topology or traffic changes

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