Analyzing the initial connection packets

I've spent the day analyzing the initial startup packets and how they are built up. First of all let's take a look at the order of the first seven packets:

The client starts by sending the server a 0x00010000 packet. This packet contains the clients version, the locale timestamp of the server in UTC and the login token obtained from the GLS server (this is the central server you are using for your login).

The server answers this by a 0x00040000 packet. This packets contains identifiers for the server, some seemingly random data, a test token to be sent back by the client, necessary instructions for checksumming and a constant.

Now the client will send a 0x00080000 packet to the server. The packet contains the test token from the server in reversed form and an unknown constant. From now on the connection is established and packets will be sent encrypted and properly checksummed.

After this step the server will start sending a large block of data, namely data worth 4 packets. The server will initiate this transfer with a 0x01000006 packet. This packet, again, constains the server identification and (at least in the case of my account) always the same data. The following two 0x00000006 (1, 2) packets are the same for my account no matter which server I chose. After this there always is another 0x00000006 packet, but it differes heavily depending on the server (or maybe other facts).

Further investigation is necessary, especially if the packets differ depending on the language of the client. It simply might be the case that Gwaihir has more information to tell than Vanyar, but this is unlikely. From what I remember we already know that these packets contain the strings (or better said the number of the string in a large list of strings known to the client) the client will display during the startup.