Table 1 Description of Hello packet field

Source address

4

The IP address of the host is sending to

Sequence number

2

Unique sequence number of this message

Max. hop count

2

The number of maximum hop count this

message travel the networks

Hello interval

2

The number of seconds source node waits

between sending Hello messages

Dead interval

2

The number of seconds a router can be

‘silent’ before it is considered to have failed