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-rw-r--r--share/man/man4/ip.412
1 files changed, 12 insertions, 0 deletions
diff --git a/share/man/man4/ip.4 b/share/man/man4/ip.4
index 02dd01cece6..8716cfa4a30 100644
--- a/share/man/man4/ip.4
+++ b/share/man/man4/ip.4
@@ -133,6 +133,18 @@ cmsg_len = sizeof(struct in_addr)
cmsg_level = IPPROTO_IP
cmsg_type = IP_RECVDSTADDR
.Ed
+.Pp
+The IP_PORTRANGE
+option causes the default allocation policy for when the kernel is asked
+to choose a free port number. Three choices are available:
+.Bl -tag -width IP_PORTRANGE_DEFAULT
+.It IP_PORTRANGE_DEFAULT
+The regular range of non-reserved ports.
+.It IP_PORTRANGE_HIGH
+A high range, for fun.
+.It IP_PORTRANGE_LOW
+Reserved ports; between 600 and 1023.
+.El
.Ss "Multicast Options"
.Pp
.Tn IP