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Exercises
| 27.1 | In our IPv4 source route example at the end of Section 27.3, what changes if we specify each intermediate node to the client with the -G option, instead of the -g option? |
| 27.2 | The length of the buffer specified to setsockopt for the IP_OPTIONS socket option must be a multiple of 4 bytes. What would we do if we did not place an NOP at the beginning of the buffer, as shown in Figure 27.1? |
| 27.3 | How does ping receive a source route when the IP record route option is used (described in Section 7.3 of TCPv1)? |
| 27.4 | In the example code from the rlogind server at the end of Section 27.3 that clears a received source route, why is the socket descriptor argument for getsockopt and setsockopt 0? |
| 27.5 | For many years, the code we showed at the end of Section 27.3 that clears a received source route looked like the following:
What is wrong with this code? Does it matter? |
