1. packet type - 1 byte
2. ip (source)

• ip part 1 (4 bytes)
• ip part 2 (4 bytes)
• ip part 3 (4 bytes)
• ip part 4 (4 bytes)

3. port (source) - 4 bytes
4. nothing
5. nothing
6. 'hello' payload

1. packet type - cIIIIIII
2. ip of the node that created the message

• ip part 1 (4 bytes)
• ip part 2 (4 bytes)
• ip part 3 (4 bytes)
• ip part 4 (4 bytes)

3. port of the node that created the message
4. sequence number
5. time to live

6. list of directly connected neighbors to that node, with the cost of the link to each one

1. packet type - cIIIIIIIIII
2. source ip of the node that created the message

• ip part 1 (4 bytes)
• ip part 2 (4 bytes)
• ip part 3 (4 bytes)
• ip part 4 (4 bytes)

3. source port of the node that created the message
4. nothing
5. time to live
6. dest ip of the node that created the message

• ip part 1 (4 bytes)
• ip part 2 (4 bytes)
• ip part 3 (4 bytes)
• ip part 4 (4 bytes)

5. dest port of the node that created the message

questions:

• what is the ttl when sending a new link state packet
• format for sending neighboring nodes and cost of a link state packet

TODO: what to send for link state packet? neighboring nodes? how does that work if I am forwarding the neighboring nodes from node A and I am node C by now... just neighboring nodes? or cost? why does it need to send the cost?

do we send hello message to only active neighbors? or all neighbors in the original topology?