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-rw-r--r--src/dnscap.1.in12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/dnscap.1.in b/src/dnscap.1.in
index 82a44fd..f33fcfc 100644
--- a/src/dnscap.1.in
+++ b/src/dnscap.1.in
@@ -1,4 +1,4 @@
-.\" Copyright (c) 2016-2021, OARC, Inc.
+.\" Copyright (c) 2016-2022, OARC, Inc.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
@@ -212,9 +212,17 @@ Can be given as "\-" to indicate standard input.
.TP
.BI "\-i " if
Select an interface to be monitored.
+
On BSD systems, the default is the first interface that was configured at
system boot time.
-On Linux systems, the default is to monitor all interfaces.
+
+On Linux systems, the default might be to monitor all interfaces but most
+commonly it will also capture on the first interface.
+This depends on the libpcap version.
+
+If you want to make sure you're capturing on all interfaces then use the
+special "any" or "all" (depends on system).
+
More than one interface may be selected which will cause output to be
interleaved from all selected interfaces.
.TP