Just for curiosity's sake, check the UPnP settings on both machines.

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ray Spaulding
Sent: Monday, October 11, 2004 2:04 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: [hlds] NAT transparency with listenservers

I have also notice this. And here's my proof of it:

I have a NAT network run on XP Pro. All other machines in the LAN have
non-routable IPs. As most of you know, you cannot create rules of forwarding
in client versions of WIN products without modification or programs. This
setup is also XP firewalled by all the machines in the house under the SP2
update recently released from MS. I started a server on machine
192.168.0.131:27055 for testing of CS Source. I ran it a couple minutes and
then fired a CZ server on the same machine to test for cpu usage. As I was
firing up this second server I was surprised to see someone join the first
CS:Source server. As I gaped at this, supposedly, impossibility I witnessed
the same thing happen to the CZ server running on that same machine at port
27050. In my amazement I went to two other machines in the LAN and joined
that server. And then started to play with the guy connected to the server
on 192.168.0.131:27055! Additionally I went to the main hub of the LAN
located at 192.168.0.1/66.31.77.xx and turned on HLSW pointing to the LAN
server. He was fully connected in the game and having a blast. I turned HLSW
to the CZ server I had running with bots for testing and found the same
thing with 3 people in it.

I have lacked posting here as I thought it a fluke and forgot about it as I
shut the servers down. The one thing I failed to do was look on the Master
List to see if my IP was there running at my public IP:27055 or whether or
not it was modified by the NAT function in XP Pro to a random port for
outgoing connections. I look forward to doing so tomorrow though just to
test that theory.

Ultimately, without a doubt, STEAM is bypassing the normal rules of routing
and allowing connections to LAN systems from the internet. Now if THIS isn't
a MAJOR security issue with this garbage then nothing else is.

I look forward to responses to this and other people's experience on this
one.

Ray S.

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David Fencik
Sent: Sunday, October 10, 2004 11:19 PM
To: [EMAIL PROTECTED]
Subject: RE: [hlds] NAT transparency with listenservers

How big is your network?

Dave

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of AgentHH
Sent: Sunday, October 10, 2004 10:44 PM
To: [EMAIL PROTECTED]
Subject: [hlds] NAT transparency with listenservers

So, I started a listenserver to mess around in the new levels.
I'm behind a fairly restrictive NAT/router with nothing forwarded to my
comp. Much to my surprise, some guy joined my game. Is there some kind of
NAT transparency with HL2, much like that of UT2K4?

--AgentHH

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