[cod] COD4: 2 players with same guid (hack?)

[Robert Ros]

True, guids always remain the same (by definition). But I also agree on 
Andre, guids are locked to an ip address for about 10 minutes. I 
discovered this when I tried to play over an vpn connection. My ISP has 
some bad routings sometimes (i.e. Amsterdam-London but via New York or 
Stockholm) This results in a ping about 120 or so. So I use my 
university vpn connection. But when I've had joined a server with my own 
connection, I had to wait about 10 minutes before the master server 
released the lock on that ip address.

For 2 people on the same lan with the same ip address this is not a 
problem I guess as they have both the same ip address and the same guid, 
this ip was in the master server table anyway.

Regarding the guidrelax settings: It will only look at unknown guids, 
guids from wrong ip addresses or duplicates. Someone said before: most 
statistics programs use the guid as an unique id (makes sense) but it 
becomes hard when 2 or 3 people with the same guid, same ip and chaning 
nickname are playing on your server.

I think the only workaround available is to change the guidrelax setting 
back to 0 every 5 minutes or so with a PB task:

pb_sv_task 0 300 pb_sv_guidrelax 0

This is the definition of guidrelax according evenbalance:

PB_SV_GUIDRelax [0-7]
Defaults to 0; Controls PunkBuster's kicking behavior related to GUIDS; 
A Value of 1 means PB will not kick for UNKN (Unknown) GUIDs; A Value of 
2 means PB will not kick for WRONGIP GUIDs (these are GUIDS which are 
valid but not from the IP Address the player is connecting from); A 
Value of 4 means PB will not kick for DUPLICATE GUIDs; These values (1, 
2 and 4) can be combined to achieve the desired behavior


Best regards,

Robert Ros

http://team-silverbullet.nl/


Ronny Schedel wrote:
> It's not working in this way.
> 
> guid = global unique identifier
> 
> An IP is not global unique and cannot be used as guid. The CD key is a 
> global unique and is used. We have a statistic system running, which 
> relies on guids. I have also a dynamic IP address, but my guid remains 
> always the same, because the guid depends from the CD key. If two people 
> have the same guid, then they have the same CD key.
> 
> Best regards
> 
> Ronny Schedel
> 
> ----- Original Message ----- From: "Andre Lorbach" 
> <alorbach at ro1.adiscon.com>
> To: <cod at icculus.org>
> Sent: Monday, March 03, 2008 10:38 AM
> Subject: RE: [cod] COD4: 2 players with same guid (hack?)
> 
> 
> The master server is caching the Guids based on IP, people playing from
> the same location (typically like brothers in LAN) often have the same
> GUID, but use different cdkeys! I believe them game is forcing
> pb_sv_guidrelax 7 because of this.
> 
> And there are also other issues which can happen because of this kind of
> caching behavior, I have seen this one at least ONCE. Let me explain
> what happened...
> 
> A clanm8 came to me and told me he got kicked for GLOBAL BAN once, but
> never again then.
> So I searched the logfiles and saw that his GUID was different for this
> one time when he got kicked.
> He told me he did not change his cdkey, and I believe him because it
> doesn't make sense to change your key to a banned one, and change it
> back then.
> 
> So here is what I think happened, and you must know that in germany we
> usually have a forced disconnect every 24hours where we get a new IP
> assigned. IP's are rare, so it is very usual to get an IP somebody else
> wasusing 5 minutes ago. Somebody with a Global banned key tried to play
> Cod4 minutes ago, then got a disconnect. My m8 had the disconnect a few
> minutes after this, and obtains the IP from the global banned player. My
> clanm8 connects to a server, and the master auth server uses the cached
> (and banned) GUID for my clanm8.
> 
> It's a very rare condition but not impossible to happen.
> 
> Best regards,
> Andre
> 
> 
>> -----Original Message-----
>> From: Ronny Schedel [mailto:info at ronny-schedel.de]
>> Sent: Sunday, March 02, 2008 5:02 PM
>> To: cod at icculus.org
>> Subject: [cod] COD4: 2 players with same guid (hack?)
>>
>> Hello,
>>
>> today we had 2 players with the same guid on our COD4 server. Is it a
> hack?
>> Can we prevent this server side?
>>
>> Best regards
>>
>> Ronny Schedel
>>
>>
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