-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.
Appendix B : Tool Syntax 703
Chapter Tool Syntax
Chapter 5
(continued)
WinDump On Linux systems with 2.2 or later kernels, an interface
argument of ???any??? can be used to capture packets from
all interfaces. Note that captures on the ???any??? device
will not be done in promiscuous mode.
If the -D flag is supported, an interface number as
printed by that flag can be used as the interface
argument.
-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.???
-L List the known data link types for the interface and
exit.
-m Load SMI MIB module definitions from file module.
This option can be used several times to load several
MIB modules into tcpdump.
-M Use secret as a shared secret for validating the
digests found in TCP segments with the TCP-MD5
option (RFC 2385), if present.
-n Do not convert addresses (i.e., host addresses, port
numbers, etc.) to names.
-N Do not print domain name qualification of host
names. For example, if you give this flag then tcpdump
will print ???nic??? instead of ???nic.
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