Static Routing

Routing

• Stop Broadcast
• Find best possible path to destination
• Moving unicast traffic between network

Router Facts

• Routers only know about connected networks
• Default route acts as catch-all
• In case of multipleroutes, the more specific route (higher subnet mask)will be selected by router to select the best path
  • 192.168.1.0 255.255.255.0 going to f0/1
  • 192.168.1.0 255.255.255.128  going to f1/1
  • If these are the two entries in routing table,
    • then A PACKET DESTINED FOR 192.168.1.1 will go to f1/1

R1

---

• sh ip int brief
• ping 192.168.1.1
• ping 192.168.2.2
• ping 192.168.3.1 [failed]
• sh ip route
• ip route 192.168.3.0 255.255.255.0 192.168.2.2
• ping 192.168.3.1 source 192.168.1.2 [failed]

R2

---

• sh ip int br
• sh ip route
• ip route 192.168.1.0 255.255.255.0 192.168.2.1

R3

---

• sh ip int br
• sh ip route
• ip route 192.168.2.0 255.255.0.0 192.168.1.2
• ip route 192.168.3.0 255.255.0.0 192.168.1.2

 REACH OUT TO INTERNET

R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.1

R2(config)#ip route 0.0.0.0 0.0.0.0 192.168.2.1

R3(config)#ip route 0.0.0.0 0.0.0.0 68.110.171.99

 

ctrl + shift + 6 break out from ping, if got stuck