11-01-2011
It seems that there are some sort of firewalls in between your host and other hosts which discards ICMP packets .
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LEARN ABOUT FREEBSD
ruptime
RUPTIME(1) BSD General Commands Manual RUPTIME(1)
NAME
ruptime -- show host status of local machines
SYNOPSIS
ruptime [-alrtu] [host ...]
DESCRIPTION
The ruptime utility gives a status line like uptime(1) for each machine on the local network; these are formed from packets broadcast by each
host on the network once every three minutes.
If no operands are given, ruptime displays uptime status for all machines; otherwise only those hosts specified on the command line are dis-
played. If hosts are specified on the command line, the sort order is equivalent to the order hosts were specified on the command line.
Machines for which no status report has been received for 11 minutes are shown as being down, and machines for which no status report has
been received for 4 days are not shown in the list at all.
The options are as follows:
-a Include all users. By default, if a user has not typed to the system for an hour or more, then the user will be omitted from the
output.
-l Sort by load average.
-r Reverse the sort order.
-t Sort by uptime.
-u Sort by number of users.
The default listing is sorted by host name.
FILES
/var/rwho/whod.* data files
SEE ALSO
rwho(1), uptime(1), rwhod(8)
HISTORY
A ruptime utility appeared in 4.2BSD.
BSD
March 1, 2003 BSD