doc: document nat table for IPv6

Based on the IPv4 description.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/iptables/ip6tables.8.in b/iptables/ip6tables.8.in
index 58b7bfc785b0d4266d808314438f16c72258b275..24c6f66167d5f76e962300bdc93ac09448f9546c 100644 (file)
--- a/iptables/ip6tables.8.in
+++ b/iptables/ip6tables.8.in
@@ -106,6 +106,13 @@ the built-in chains \fBINPUT\fP (for packets destined to local sockets),
 \fBFORWARD\fP (for packets being routed through the box), and
 \fBOUTPUT\fP (for locally-generated packets).
 .TP
+\fBnat\fP:
+This table is consulted when a packet that creates a new
+connection is encountered.  It consists of three built-ins: \fBPREROUTING\fP
+(for altering packets as soon as they come in), \fBOUTPUT\fP
+(for altering locally-generated packets before routing), and \fBPOSTROUTING\fP
+(for altering packets as they are about to go out). Available since kernel 3.7.
+.TP
 \fBmangle\fP:
 This table is used for specialized packet alteration.  Until kernel
 2.4.17 it had two built-in chains: \fBPREROUTING\fP