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The IP Record Route option enables the recording of the path where each router traversed inserts its IP address (up to 9 routers). (Traceroute is likely to be used instead but I want to understand record route). So my question is:

When you send a packet with record route option enabled, how do you get the response?

For example, if we have the path $A\rightarrow R_1 \rightarrow R_2 \rightarrow B$, and I send a packet with IP record route option enabled, how will $A$ get the response that $R_1$ and $R_2$ were on the route? I don't see anywhere that B has to respond to the record route option. Thanks.

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See here: en.wikipedia.org/wiki/Traceroute#Implementation – FUZxxl Nov 11 '12 at 11:00
Is there a conceptual problem here, or are you asking purely about the specific protocol (implementation)? Note also the meta question prompted by the closevotes on this question. – Raphael♦ Nov 20 '12 at 8:43

closed as off topic by Vor, Luke Mathieson, Realz Slaw, Stéphane Gimenez, Merbs Nov 25 '12 at 19:22

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