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Lab - Viewing Host Routing Tables

© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 4 of 6

The local default route 0.0.0.0 is used when the packet does not match other specified addresses in the routing table. The packet will be sent to the gateway from the PC for further processing. In this example, the packet will be sent to 192.168.1.1 from 192.168.1.11.

The loopback addresses, 127.0.0.0 – 127.255.255.255, are related to direct connection and provide services to the local host.

The addresses for the subnet, 192.168.1.0 – 192.168.1.255, are all related to the host and the local network. If the final destination of the packet is in the local network, the packet will exit 192.168.1.11 interface.

- The local route address 192.168.1.0 represents all devices on the 192.168.1.0/24 network.

- The address of the local host is 192.168.1.11.

- The network broadcast address 192.168.1.255 is used to send messages to all the hosts on the local network.

The special multicast class D addresses 224.0.0.0 are reserved for use through either the loopback interface (127.0.0.1) or the host (192.168.1.11).

The local broadcast address 255.255.255.255 can be used through either the loopback interface (127.0.0.1) or host (192.168.1.11).

Based on the contents of the IPv4 routing table, if the PC wanted to send a packet to 192.168.1.15, what would it do and where would it send the packet?

If the PC wanted to send a packet to a remote host located at 172.16.20.23, what would it do and where would it send the packet?

Part 3: Examine IPv6 Host Routing Table Entries

In Part 3, you will examine the IPv6 routing table. This table is in the third section displayed in the netstat –r output. It lists all the known IPv6 routes including direct connections, local network and local default routes.

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Page 5 of 6

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Lab - Viewing Host Routing Tables

© 2013 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 6 of 6

Reflection

1. How is the number of bits for the network indicated for IPv4. How is it done for IPv6?

2. Why is there both IPv4 and IPv6 information in the host routing tables?