Packet routing

In this paragraph we will test packet routing by sending different packets from network to network and checking if we the network entities have the expected behaviour.

Note that the network entity output is enough explicit. So there will not be many comments about it.

• Sending IP packet from H_8 to H_7 through GW 7-8

  Figure 4.7: P1 : H_8 $\rightarrow$ H_7

  

• Sending IP packet from H_6 to H_7 through GW 6-7

  Figure 4.8: P2 : H_6 $\rightarrow$ H_7

  

• Sending IP packet from H_6 to H_8 through GW 6-7 then GW 7-8

  Figure 4.9: P3 : H_6 $\rightarrow$ H_8

  

• Sending IP packet from H_8 to H_6 through GW 7-8 then GW 6-7

  Figure 4.10: P4 : H_8 $\rightarrow$ H_6

  

• Sending IP packet from H_6 to an undefined IP address in the network 154.45.8.0. The packet will be routed from GW 6-7 to GW 7-8 because GW 6-7 have a route to the network 154.45.8.0 through GW 7-8. When the packet reaches GW 7-8 an error is issued.

  Figure 4.11: P5 : H_6 $\rightarrow$ Undefined Host

  

• Sending an IP packet from H_6 to an undefined IP address in an undefined network. The GW 6-7 will issue a unreacheable Network error because there is no corresponding route in its routing table.

  Figure 4.12: P6 : H_6 $\rightarrow$ Undefined Network