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From "J. Greenlees" <li...@jaqui-greenlees.net>
Subject Re: [users@httpd] What IP address is this log entry coming from? (Is "::" a valid IP address?)
Date Thu, 02 Sep 2010 21:40:50 GMT
Jeff Trawick wrote:
~snip~
>>> %a is supposed to be an IP address, so what IP address is "::"? I'm only
>>> somewhat familiar with IPv6 but I've never seen "::" before.
>> http://en.wikipedia.org/wiki/IPv6_address#Notation
>>
>> One or any number of consecutive groups of zero value may be replaced
>> with two colons. [ ... ]
>>
>> The localhost (loopback) address, 0:0:0:0:0:0:0:1, and the IPv6
>> unspecified address, 0:0:0:0:0:0:0:0, are reduced to ::1 and ::,
>> respectively.
>>
> 
> and it is bogus to have the unspecified address as the client IP address

and if you check MS' RPC mechanism it uses 0.0.0.0 for the ip address to 
glom onto ANY available ip address. That suggests that the client giving 
the :: address is most likely a bot of some sort.
it could be a legitimate bot for an rpc mechanism, or it could be [ 
seems more likely ] to be one meant to find an exploitable weakness.

or, the client could be using an anonymizer  service before getting to 
the OPs site.

many reasons that it could be the ip unspecified address, only a few of 
which are cause for concern to the server admin.

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