Figure 48 Route discovery in Ariadne in .NET

Maker Code 128 in .NET Figure 48 Route discovery in Ariadne
Figure 48 Route discovery in Ariadne
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request message transmitted by S Node A on the receipt of this message needs to check that the time interval is valid In addition, it also needs to check that it has not seen this message earlier If both these checks pass, node A calculates the new value of the hash chain as shown in step 2 of Figure 48 In addition, node A also adds its identity to the node list and calculates a new MAC using the key KA The resulting message is then broadcast by node A to its neighbors and is shown as step 2 in the gure Node B, which is assumed to receive the route request message transmitted by node A in step 2, also repeats the same procedure This is shown in step 3 It is assumed that the destination node D receives the route request packet transmitted by node B This concludes the route request phase The destination D, before transmitting the route reply, needs to perform two checks to validate the message as explained earlier Following this, node D then creates the route reply message by copying many of the elds from the route request message received In addition node D also creates the target MAC eld as shown in step 4 above Node D then transmits the message to node B Node B after receiving this message, waits until it can release the TESLA key It then appends the key to the key list and transmits the message to node A as shown in step 5 Node A repeats the same and transmits the message to the source in step 6 The source, on receiving the route reply message, performs the three checks and accepts the route if the checks are veri ed Ariadne also supports route maintenance as described in DSR A node that determines that a link to the next hop is broken sends a route error message to the originator of the packets it is trying to forward In order to prevent unauthorized nodes from sending such error messages, these messages also have to be authenticated by the sender The route error message contains the following elds:
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route error label specifying that this is a route error message; sending address the address of the node sending the route error message; receiving address the address of the intended next hop the node generating the route error message is trying to forward packets to; time interval the TESLA time interval; error MAC the MAC of the preceding elds of the route error message computed using the TESLA key of the node originating the error message recent TESLA key the most recent disclosable TESLA key of the node sending the error message
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The route error message is routed as a regular data packet towards the source of the message that cannot be forwarded because of the broken link along the reverse path The sender of the route error message can determine this path from the packet (since this is a source routing protocol) Each node forwarding the route error message and the destination of this message have to clear any routes from their cache that contain the failed link They then use a different route if possible or use the route discovery process for identifying new routes Before this, these nodes will have to authenticate the route error message The authentication can be done once the node that originates the route error message discloses the TESLA key used in the error MAC eld The originating node does this once the time interval speci ed in the rst route error message ends Note that the nodes can continue to send data along the route until the error message is validated Data using the erroneous link will result in multiple route error messages
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