Copy the description for the -r option from the traceroute(8) man

page. I'm pretty sure that this description applies the same way to
ipv6, and at least mentioning SO_DONTROUTE is better than having no
description at all.

1 files changed, 10 insertions, 0 deletions

diff --git a/usr.sbin/traceroute6/traceroute6.8 b/usr.sbin/traceroute6/traceroute6.8
index 8b2fe0d..08ccb0a 100644
--- a/usr.sbin/traceroute6/traceroute6.8
+++ b/usr.sbin/traceroute6/traceroute6.8
@@ -115,6 +115,16 @@ Set UDP port number to
 Set the number of probe per hop count to
 .Ar probes .
 .It Fl r
+Bypass the normal routing tables and send directly to a host
+on an attached network.
+If the host is not on a directly-connected network,
+an error is returned.
+This option corresponds to the
+.Dv SO_DONTROUTE
+socket option;
+it can be used to ping a local host through an interface
+that has no route through it
+(e.g., after the interface was dropped by a routing daemon).
 .It Fl s Ar src
 .Ar Src
 specifies the source IPv6 address to be used.