-f Print ???foreign??? Internet addresses numerically rather
than symbolically (this option is intended to get around
an issue with Sun??™s yp server??”usually it hangs forever
translating nonlocal Internet numbers).
-F Use file as input for the filter expression. An additional
expression given on the command line is ignored.
-i Listen on interface. If unspecified, tcpdump searches
the system interface list for the lowest numbered,
configured interface (excluding loopback). Ties are
broken by choosing the earliest match.
-l Make stdout line buffered. Useful if you want to see
the data while capturing it. For example, ???tcpdump -l |
tee dat??? or ???tcpdump -l > dat & tail -f dat.???
-n Do not convert addresses (i.e., host addresses, port
numbers, etc.) to names.
-N Do not print domain name qualification of
hostnames. For example, if you give this flag then
tcpdump will print ???nic??? instead of ???nic.ddn.mil.???
-O Do not run the packet-matching code optimizer. This
is useful only if you suspect a bug in the optimizer.
-p Do not put the interface into promiscuous mode.
Note that the interface might be in promiscuous mode
for some other reason; hence, -p cannot be used as an
abbreviation for ether host {local-hw-addr} or ether
broadcast.
-q Quick (quiet?) output. Print less protocol
information so output lines are shorter.
-r Read packets from file (which was created with the
-w option). Standard input is used if file is ???-.
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