Options (Options) is a growing field and is optional. Optional fields are primarily used for testing. Common options are as follows:
Loose Source Routing - It gives an IP address sequence of a series of router interfaces. The message must be transmitted along the IP address sequence, but multiple routers are allowed to skip multiple routers between the two addresses.
Strong Source Source Routing - gives an IP address sequence of a series of router interfaces. The message must be forwarded in strict accordance with the route. If the next hop is no longer in the list. Then there will be an error will occur.
Recording Routing Options - When the packet is left, the outbound interface address of each router is provided for each router to save the record of all routers passing through the message. Record the routing options provide similar to routing tracking Function, but the difference is that the outbound interface information on the two-way path is recorded here.
Timestamp Options (TimeStamp) - In addition to each router, the timestamp option is very similar to the recording routing option, so that the message is not unable to know that you have arrived there, and you can also record the time you arrive. .
