`ip_id' now expected in host byte order when IP_HDRINCL is in use.

share/man/man4/ip.4

@@ -32,7 +32,7 @@
 .\"     @(#)ip.4	8.2 (Berkeley) 11/30/93
 .\" $FreeBSD$
 .\"
-.Dd November 30, 1993
+.Dd September 1, 2000
 .Dt IP 4
 .Os BSD 4.2
 .Sh NAME
@@ -368,6 +368,10 @@ ip->ip_off = offset;
 If the header source address is set to 
 .Dv INADDR_ANY,
 the kernel will choose an appropriate address.
+.Pp
+The header identification field
+.Dq Li ip_id
+is expected in host byte order.
 .Sh DIAGNOSTICS
 A socket operation may fail with one of the following errors returned:
 .Bl -tag -width [EADDRNOTAVAIL]
@@ -416,3 +420,11 @@ The
 .Nm
 protocol appeared in
 .Bx 4.2 .
+.Pp
+If the
+.Dv IP_HDRINCL
+option is in use,
+.Fx 4.2
+and above expect
+.Dq Li ip_id
+field in host byte order.