Re: Gsoc 2011 idea about IPv6

[David Fifield <david () bamsoftware com>]

On Sun, Mar 20, 2011 at 11:26:49AM +0800, 许伟林 wrote:
> Hi all,
>     I'm a college student from Beijing, China. This is my 3rd year of
> computer science. I'm very interested in nmap so I would like to apply for
> the Gsoc 2011 program.
>     Actually, I have been researching IPv6 in part time for half a year and
> got some experiences. Last November, I helped Simon Kelley improve a feature
> of Dnsmasq about IPv6 DNS. (Mail-subject named 'Modification to the feature
> of config-static DNS    record in dual-stack network.' in
> http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2010q4/subject.html).

That's good. Involvement in other free software projects is good, so be
sure to mention it in your proposal.

>     In addition, my team has created a open-source project 'stateful
> IPv6-to-IPv6 Network Address Translation (NAPT66)' last month in
> http://code.google.com/p/napt66/. NAPT66 has been deployed in several types
> of middle-box routers and Chinese people can use it to reduce the expensive
> cost of accessing Internet.
>     I have read the 6 required items of IPv6 support carefully, and got some
> ideas.
>     For the first 5 items, are the basic theories the same to IPv4's ways?

This is an interesting question. We are not sure, so part of this
project will involve doing research and testing the new possibilities of
IPv6.

For OS detection, there is at least one tool that applies identical
techniques to IPv4 and IPv6 OS detection:
http://www.gomor.org/bin/view/Sinfp. I think we need to research new
tests though. You can see some ideas we've had in the file notes.txt in
        svn co --username guess --password "" svn://svn.insecure.org/nmap-exp/david/ipv6

Port scans and traceroute will probably be mostly the same. Something to
think about is the possibility of including extension headers.

>     For the 6th item about IPv6 host discovery, I think we have more than
> two ways to handle this problem.
>     First, we can used a public BGP information to narrow down the IPv6
> address space so that 2^128 times of scanning are not necessary.
>     Second, we can use the worm's technique to discover all active hosts in
> a subnet. I recently read a paper about worm exploiting IPv6 network. (A new
> worm exploiting IPv6 and IPv4-IPv6 dual-stack networks: experiment,
> modeling, simulation, and
> defense<http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5274918>)

Thanks, these are good ideas. We've had some others in the ipv6.txt file
I linked above. In some ways I think host discovery on the same subnet
will be easier and more effective than with IPv4 because we can use
multicast to do most of the work. For remote hosts it's harder; I
suspect that we will start relying more on NSE scripts to find targets.

If you like, please comment on the ipv6.c program in the Subversion
directory I linked above. I'm thinking to use its functions as the base
of Nmap's raw IPv6 sending.

David Fifield
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