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OS Fingerprinting using ICMP - AFCEH Question

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morpheus063

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Post Fri Jul 07, 2006 12:51 pm

OS Fingerprinting using ICMP - AFCEH Question

Hi Friends,

I am posting more questions that I have faced during my AFCEH course. Please discuss the same. The next question is:
In the OS Fingerprinting technique of using Ping and Traceroute, what is the mathematical calculation that one needs to perform?

1. Final TTL Value + Number of Hops
2. Final TTL Value + Number of Hops - 1
3. Final  TTL Value + Number of Hops - Round Trip Time
4. Initial TTL Value + Number of Hops
5. Initial TTL Value + Number of Hops + Round Trip Time


Regards,

The Morpheus
Manu Zacharia
MVP (Enterprise Security), ISLA-2010 (ISC)², C|EH, C|HFI, CCNA, MCP,
Certified ISO 27001:2005 Lead Auditor

[b]There are 3 roads to spoil; women, gambling & hacking. The most pleasant with women, the quickest with gambling, but the surest is hacking - c0c0n
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Dengar13

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Post Fri Jul 07, 2006 2:10 pm

Re: OS Fingerprinting using ICMP - AFCEH Question

Are we here to pass this for you?  Do you have any idea what the answer is or are you relying solely on us?
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morpheus063

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Post Fri Jul 07, 2006 9:18 pm

Re: OS Fingerprinting using ICMP - AFCEH Question

Hi Dengar and fellow friends,

If my frequent postings of questions have hurted any of the fellow members, I am extremely sorry for the same. My aim was to share the questions (especially the tricky questions) with the fellow forum members as it would be opening up new thinking dimensions for all wanna-be ethical hackers. If I did anything wrong, moderators - please point out the same.

Regarding the answers, as per the book Network Security - A Hacker's Perspective, it is given that the Initial TTL value of a data packet = Final TTL value of the packet + Number of routers in the path.

However, in the question it is not asking for the Initial TTL value, it is asking for just the mathematical calculation. So I think, the answer is (2). Since there are two options for the answer, I consider it as a tricky one and wanted to share it with the rest of the forum. If you or anybody felt that I have some other intentions, sorry for the same.

Regards,

The Morpheus
Manu Zacharia
MVP (Enterprise Security), ISLA-2010 (ISC)², C|EH, C|HFI, CCNA, MCP,
Certified ISO 27001:2005 Lead Auditor

[b]There are 3 roads to spoil; women, gambling & hacking. The most pleasant with women, the quickest with gambling, but the surest is hacking - c0c0n
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pcsneaker

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Post Sat Jul 08, 2006 4:48 am

Re: OS Fingerprinting using ICMP - AFCEH Question

Regarding the answers, as per the book Network Security - A Hacker's Perspective, it is given that the Initial TTL value of a data packet = Final TTL value of the packet + Number of routers in the path.


So I think, the answer is (2)


2.  Final TTL Value + Number of Hops - 1


Just read what you have posted and review your math...
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