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diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,7 +28,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd June 6, 2024
+.Dd April 24, 2025
.Dt IFCONFIG 8
.Os
.Sh NAME
@@ -448,11 +448,10 @@
allow you to respecify the host portion.
.It Cm anycast
(Inet6 only.)
-Specify that the address configured is an anycast address.
-Based on the current specification,
-only routers may configure anycast addresses.
-Anycast address will not be used as source address of any of outgoing
-IPv6 packets.
+Specify that the address configured is an anycast address,
+as described in RFC 4291 section 2.6.
+Anycast addresses will not be used as source address of any outgoing
+IPv6 packets unless an application explicitly binds to the address.
.It Cm arp
Enable the use of the Address Resolution Protocol
.Pq Xr arp 4
@@ -3326,6 +3325,16 @@
.Xr rc 8 ,
.Xr routed 8 ,
.Xr sysctl 8
+.Rs
+.%R RFC 3484
+.%D February 2003
+.%T "Default Address Selection for Internet Protocol version 6 (IPv6)"
+.Re
+.Rs
+.%R RFC 4291
+.%D February 2006
+.%T "IP Version 6 Addressing Architecture"
+.Re
.Sh HISTORY
The
.Nm
diff --git a/sys/netinet6/in6_pcb.c b/sys/netinet6/in6_pcb.c
--- a/sys/netinet6/in6_pcb.c
+++ b/sys/netinet6/in6_pcb.c
@@ -214,14 +214,13 @@
}
/*
- * XXX: bind to an anycast address might accidentally
- * cause sending a packet with anycast source address.
- * We should allow to bind to a deprecated address, since
- * the application dares to use it.
+ * We used to prohibit binding to an anycast address here,
+ * based on RFC3513, but that restriction was removed in
+ * RFC4291.
*/
if (ifa != NULL &&
((struct in6_ifaddr *)ifa)->ia6_flags &
- (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_DETACHED)) {
+ (IN6_IFF_NOTREADY | IN6_IFF_DETACHED)) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}

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