FF25 - Ping & Pong
FF 25 08 00 EA 7F DB 02
This is used to determine the player's latency. It may also
be used as a keepalive (although this seems a bit silly since
there is the 0x00FF packet.) This used-to be "spoofable" on
battle.net(tm) to obtain 0 lag, however this has since been
fixed. You will notice when your tcp connection is lagging
or breaking up you will get a bunch of PING packets.
BNETD tends to send these a little more often as it updates
the lag bars in realtime. I would take a guess battle.net(tm)
planned on doing this at one point, but it ended up eating up
too much bandwidth.
If a client receives a Ping & Pong packet, the exact same packet is
u16 pkt_type; // 0x25ff
u16 pkt_len; // Always 0x0008.
u32 ticks; //