[ipv6hackers] Question on tools use to monitor fragmented packet attacks

Owen DeLong owend at he.net
Sat Apr 13 22:44:00 CEST 2013

I've found tcpdump to be a much easier and more versatile tool for this purpose as well.

TCPdump's cleverness is usually a bit less "overly-clever" than wireshark and it seems to do a better job of noticing what is wrong and flagging it.



On Apr 13, 2013, at 00:58 , Marc Heuse <mh at mh-sec.de> wrote:

> Hi Jim,
> I use Wireshark, and ignore the decoding and just examine the hexdump
> itself :-)
> Wireshark tries to be clever, and of course when things are on purpose
> not standard it fails.
> Greets,
> Marc
> On 13.04.2013 00:28, Jim Small wrote:
>> I've been doing a lot of work with Marc's THC IPv6 tools and Fernando's IPv6 Toolkit.  My tool of choice for monitoring is Wireshark.  I use a combination of monitoring from the attack system, the attacked system, and ingress/egress switchport SPAN/Monitor captures.
>> What I notice is that often times when I fragment packets (e.g. RAs) Wireshark will complain about a malformed frame in the IPv6 decode.  Whenever this happens, it seems like Windows 7 also ignores/doesn't process the frames.  I've mostly been focused on attacking and defending so I haven't dug into why this is just yet.
>> I wanted to ask - when you are attacking/probing/fuzzing systems with fragmented packets - what tools are you using to monitor the frames?  If Wireshark fails do you use tcpdump, a hex decoder, or something else?
>> Please let me know,
>>  --Jim
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