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diff --git a/share/man/man4/inet.4 b/share/man/man4/inet.4
--- a/share/man/man4/inet.4
+++ b/share/man/man4/inet.4
@@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd September 8, 2022
+.Dd December 31, 2024
.Dt INET 4
.Os
.Sh NAME
@@ -169,11 +169,11 @@
.It Va accept_sourceroute
Boolean: enable/disable accepting of source-routed IP packets (default false).
.It Va allow_net0
-Boolean: allow use of addresses in 0.0.0.0/8 as endpoints,
-and allow forwarding of packets with these addresses.
+Boolean: allow forwarding of, and ICMP responses to, packets with addresses in
+0.0.0.0/8.
.It Va allow_net240
-Boolean: allow use of addresses in 240.0.0.0/4 as endpoints,
-and allow forwarding of packets with these addresses.
+Boolean: allow forwarding of, and ICMP responses to, packets with addresses in
+240.0.0.0/4.
.It Va curfrags
Integer: Current number of IPv4 fragments across all reassembly queues
in all VNETs (read-only).
diff --git a/sys/netinet/in.c b/sys/netinet/in.c
--- a/sys/netinet/in.c
+++ b/sys/netinet/in.c
@@ -102,13 +102,13 @@
#define V_ip_allow_net240 VNET(ip_allow_net240)
SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net240,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net240), 0,
- "Allow use of Experimental addresses, aka Class E (240/4)");
+ "Allow forwarding of and ICMP response to Experimental addresses, aka Class E (240/4)");
/* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240 */
VNET_DEFINE(bool, ip_allow_net0) = false;
SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net0,
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net0), 0,
- "Allow use of addresses in network 0/8");
+ "Allow forwarding of and ICMP response to addresses in network 0/8");
/* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0 */
VNET_DEFINE(uint32_t, in_loopback_mask) = IN_LOOPBACK_MASK_DFLT;

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