Login Packet
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Login packets are packets sent by the client to the authentication server as the first connection to the server infrastructure.
All packets start with an opcode field but do not use the same values as the World Packets. The only packets that can start a connection are CMD_AUTH_LOGON_CHALLENGE Client and CMD_AUTH_RECONNECT_CHALLENGE Client which share packet layout.
There are minor differences in the packets between WoW versions, but the layout seems to be stable around 
and later.
The login packets are internally referred to as grunt and the packet layouts hint at it being planned for use for games other than WoW.
The names here are used internally in the clients.
See Login for a higher level overview of the login process.
| Name | Value | Description |
|---|---|---|
| Authentication | ||
| CMD_AUTH_LOGON_CHALLENGE | 0x00 | Intial information sent by client and then challenge by server. |
| CMD_AUTH_LOGON_PROOF | 0x01 | Proof sent by client and then server. |
| CMD_AUTH_RECONNECT_CHALLENGE | 0x02 | Reconnect challenge sent by client and then server. |
| CMD_AUTH_RECONNECT_PROOF | 0x03 | Reconnect proof sent by client and then server. |
| Miscellaneous | ||
| CMD_SURVEY_RESULT | 0x04 | Used for hardware survey. |
| Realmlist | ||
| CMD_REALM_LIST | 0x10 | Realmlist request sent by client and realmlist information sent by server. |
| Patching | ||
| CMD_XFER_INITIATE | 0x30 | Used for patching. |
| CMD_XFER_DATA | 0x31 | Used for patching. |
| CMD_XFER_ACCEPT | 0x32 | Used for patching. |
| CMD_XFER_RESUME | 0x33 | Used for patching. |
| CMD_XFER_CANCEL | 0x34 | Used for patching. |