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diff --git a/sbin/natd/natd.8 b/sbin/natd/natd.8
--- a/sbin/natd/natd.8
+++ b/sbin/natd/natd.8
@@ -1,4 +1,4 @@
-.Dd October 5, 2016
+.Dd December 6, 2024
.Dt NATD 8
.Os
.Sh NAME
@@ -14,6 +14,7 @@
.Op Fl deny_incoming | d
.Op Fl use_sockets | s
.Op Fl same_ports | m
+.Op Fl udp_eim
.Op Fl verbose | v
.Op Fl dynamic
.Op Fl in_port | i Ar port
@@ -114,6 +115,26 @@
of working.
If it is not possible to maintain the port number, it will be silently
changed as per normal.
+.It Fl udp_eim
+When enabled, UDP packets use endpoint-independent mapping (EIM) from RFC 4787
+("full cone" NAT of RFC 3489).
+All packets from the same internal address:port are mapped to the same NAT
+address:port, regardless of their destination address:port.
+If filtering rules allow, and if
+.Em deny_incoming
+is disabled, any other external address:port can
+also send to the internal address:port through its mapped NAT address:port.
+This is more compatible with applications, and can reduce the need for port
+forwarding, but less scalable as each NAT address:port can only be
+concurrently used by at most one internal address:port.
+.Pp
+When disabled, UDP packets use endpoint-dependent mapping (EDM) ("symmetric"
+NAT).
+Each connection from a particular internal address:port to different
+external addresses:ports is mapped to a random and unpredictable NAT
+address:port.
+Two appplications behind EDM NATs can only connect to each other
+by port forwarding on the NAT, or tunnelling through an in-between server.
.It Fl verbose | v
Do not call
.Xr daemon 3
diff --git a/sbin/natd/natd.c b/sbin/natd/natd.c
--- a/sbin/natd/natd.c
+++ b/sbin/natd/natd.c
@@ -1138,6 +1138,14 @@
"same_ports",
"m" },
+ { LibAliasOption,
+ PKT_ALIAS_UDP_EIM,
+ YesNo,
+ "[yes|no]",
+ "UDP traffic uses endpoint-independent mapping (\"full cone\" NAT)",
+ "udp_eim",
+ NULL },
+
{ Verbose,
0,
YesNo,

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