Uplog is an UDP-based ping program that gives an
ASCII graphical log of packet loss. Once per
second, it sends a UDP packet to the echo port of
the target host and waits for a reply. If it gets
a reply an X is written, otherwise a dot is
written to the log file. If a packet with an
incorrect sequence number arrives, a colon is
written to the log file. By examining the log
file, one can easily see when and how the packet
losses occur.
