Static Routing

• Upon booting, default routes initialized from files. Eg: /etc/rc.net in AIX, /etc/netstart in BSD, /etc/rc.local in SUN/Solaris

• ‘route’ command eg: route add default sun 1

• ICMP redirect: sent to host by router when a “better” router exists on the same subnet. Host with minimal routing knowledge can build up routing table.

• New: router discovery ICMP messages (RFC 1256)

  • Router solicitation request from host
  • Router advertisement messages from routers
  • Host reqts RFC requires host to have multiple default routes.

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