Network address translation (NAT) is a method to remap one IP address space into another space by modifying network address information in Internet Protocol datagram packet headers while in transit across a traffic routing device.
Please complete the following tasks/question:
One purpose of using NAT/PAT (Port Address Translation) is to save IP addresses. IPv6 uses 128-bit addresses, instead of the meagre 32-bit IPv4 addresses. Does that mean that IPV6 will eliminate NAT/PAT?
Using Wireshark, your task is to capture an interaction between the client (your home computer) and the CQU Webfuse webserver. In doing so, attempt to retrieve the following web page:
where YourStudentNumber needs to be replaced by your actual student number. Please use your student number only. No other page name should be used.
Use the appropriate filters in Wireshark to capture only DNS and HTTP traffic.
Figure 1 shows an example of a webpage you have to capture where YourStudentNumber is replaced by the name “s123456”:
The pcap of this web page captured with the appropriate DNS and HTTP filters is shown in Figure 2:
Figure 2 PCAP of Webpage with DNS and HTTP filters
To reproduce a capture similar to Figure 2, you may need to research how to:
For each of the sections, list the frames/packets associated with the section and highlight the section with a red ellipse in the screenshot.
2. For the three sections identified in b), explain each of the packet components in a similar way done in the Packet Capture Exercise 3. You do not have to explain all the captured frames, only the relevant frames. You may have to copy the information from the PCAP and paste it in the relevant fields of the table.
Like in part b), identify the frame number that encapsulates the retrieved webpage (html code). You also need to circle in red the paragraph with the message “The requested URL /YourStudentNumber.html was not found on this server”. You need to explain how you found both the retrieved webpage and the paragraph.
Cisco IOS (Internetworking Operating System) allows both standard and extended IP access lists as follows:
access-list 5 deny 126.96.36.199 0.0.0.0
access-list 5 permit 188.8.131.52 0.0.0.255
access-list 105 deny tcp 184.108.40.206 0.0.255.255 0.0.0.0 255.255.255.255 eq 25
Note the source/destination IP address wildcard format (it is the opposite of the IP address usual subnet mask format):
If you want to place additional restrictions or admissions in the same access list, you just need to add lines in the same format above with the same list number. Access list items are processed in the order they appear in the list from top to bottom and any packet that does not match a list entry is discarded (there is effectively a hidden ‘deny all’ rule at the end of the access list).
To complete this exercise:
Create an Access Control List that will prevent hosts in the network range of 192.168.176.0 to 192.168.191.0
Create a Cisco IOS extended IP access list that allows any host to access a web server (HTTP protocol over TLS/SSL) on TCP port 443 whose IP address is 220.127.116.11
Create a Cisco IOS extended IP access list that allows any host to access the internal
SMTP server at 18.104.22.168 (TCP port 25), and the DNS servers at 138.77. 232.10 (TCP and UDP port 53).
For this assessment item, you should submit the standard and extended access lists that you create for the exercise (these do not need to be implemented on an actual router). For further information on Cisco ACLs see:
It is well known that, the wireless signal of a Wi-Fi network is not confined to a cable as in a traditional network but instead is broadcast through the air. Recently, public Wi-Fi hotspots can be found everywhere, such as airports, hotels and coffee shops. Users can log onto the Internet with their mobile device. Along with convenience, public Wi-Fi hotspots can also provide an easy way for some attackers, like identity thieves and cybercriminals, to attack the wireless network or the users.
Complete the following tasks:
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