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-rw-r--r--src/man/anytun.8.txt11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/man/anytun.8.txt b/src/man/anytun.8.txt
index 05a650c..fa30441 100644
--- a/src/man/anytun.8.txt
+++ b/src/man/anytun.8.txt
@@ -41,6 +41,7 @@ SYNOPSIS
[ *-A|--salt* <master salt> ]
[ *-c|--cipher* <cipher type> ]
[ *-a|--auth-algo* <algo type> ]
+[ *-b|--auth-tag-length* <length> ]
DESCRIPTION
-----------
@@ -362,8 +363,14 @@ Possible values:
* *null* - no message authentication
* *sha1* - HMAC-SHA1, default value
-If HMAC-SHA1 is used, the packet length is increased by
-10 bytes. These 10 bytes contain the authentication data.
+If HMAC-SHA1 is used, the packet length is increased. The additional bytes
+contain the authentication data. see *-b|--auth-tag-length* for more info.
+
+-b|--auth-tag-length <length>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The number of bytes to use for the auth tag. This value defaults to 10 bytes
+unless the *null* auth algo is used in which case it defaults to 0.
EXAMPLES