Note that interfaces may have numerical names.

If N is a number, and is the name of an interface on the system, "-i N"
will now attempt to open that interface, not the Nth interface in the
list of interfaces.  See GitHub issue #522.

diff --git a/tcpdump.1.in b/tcpdump.1.in
index 2de8daa41cde6a24c833cf4c6c0928878d9148b4..f04a57933623a695b23e28d934fbf6b0a9d7225e 100644 (file)
--- a/tcpdump.1.in
+++ b/tcpdump.1.in
@@ -400,7 +400,7 @@ If the
 flag is supported, an interface number as printed by that flag can be
 used as the
 .I interface
 flag is supported, an interface number as printed by that flag can be
 used as the
 .I interface

-argument.
+argument, if no interface on the system has that number as a name.

 .TP
 .B \-I
 .PD 0
 .TP
 .B \-I
 .PD 0