class Net::SSH::Transport::State

def increment(packet_length)

are also incremented.
so it always fits in a 32-bit integer). The number of packets and blocks
Increments the counters. The sequence number is incremented (and remapped 
def increment(packet_length)
  @sequence_number = (@sequence_number + 1) & 0xFFFFFFFF
  @packets += 1
  @blocks += (packet_length + 4) / @block_size
end