отправить ICMP ECHO_REQUEST на сетевые узлы (send ICMP ECHO_REQUEST to network hosts)
TRYING DIFFERENT DATA PATTERNS
The (inter)network layer should never treat packets differently
depending on the data contained in the data portion.
Unfortunately, data-dependent problems have been known to sneak
into networks and remain undetected for long periods of time. In
many cases the particular pattern that will have problems is
something that doesn't have sufficient 'transitions', such as all
ones or all zeros, or a pattern right at the edge, such as almost
all zeros. It isn't necessarily enough to specify a data pattern
of all zeros (for example) on the command line because the
pattern that is of interest is at the data link level, and the
relationship between what you type and what the controllers
transmit can be complicated.
This means that if you have a data-dependent problem you will
probably have to do a lot of testing to find it. If you are
lucky, you may manage to find a file that either can't be sent
across your network or that takes much longer to transfer than
other similar length files. You can then examine this file for
repeated patterns that you can test using the -p option of ping.
