document that ip_off and ip_len are now in network byte order

diff --git a/share/man/man4/ip.4 b/share/man/man4/ip.4
index cfb7cfd..c351178 100644 (file)
--- a/share/man/man4/ip.4
+++ b/share/man/man4/ip.4
@@ -324,9 +324,13 @@ the fields of the IP header, including the following:
 ip->ip_v = IPVERSION;
 ip->ip_hl = hlen >> 2;
 ip->ip_id = 0;  /* 0 means kernel set appropriate value */
-ip->ip_off = offset;
+ip->ip_off = htons(offset);
+ip->ip_len = htons(len);
 .Ed
 .sp .5
+Additionally note that starting with
+.Tn OpenBSD 2.1
+the ip_off and ip_len fields are in network byte order.
 If the header source address is set to 
 .Dv INADDR_ANY,
 the kernel will choose an appropriate address.