How does a SYN attack deny service?
Download wireshark from http://www.wireshark.org. Select all installation options. (Note: These files are about 20 MB and may take a long time to download on a slow link.) You may also download the documentation.
1. Upload the tcp-syn-attack.cap file and answer the following 10 questions (10 points each):
1. Is this a two-way conversation? Yes
2. Are there any ACK’s? Yes
3. How long is the data portion of each packet? Why?
4. Why is the sequence number zero (seq=0) in every packet?
5. Why do the port numbers change in every packet?
6. Look at the “Time” column in the summary pane. Explain the various options it supports?
7. Click the “View” menu and select “Time Display Format”. “Seconds since beginning of capture” is checked. Select “Seconds since Previous Captured Packet”. How frequently are these packets being sent?
8. Where in the protocol tree pane would you find the protocol “Type” field?
9. Look in the flags section of the transport layer (Transmission Control Protocol” in the protocol tree section for one of the packets. What flags are set?
10. How does a SYN attack deny service?
NB. If you are getting stuck with the assignment, here are a few links that may be useful: