Update README.md

osnosn · Mar 10, 2020 · ed40065 · ed40065
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diff --git a/for_iptables/README.md b/for_iptables/README.md
@@ -22,6 +22,11 @@ Execute `rdr_port_ipt` :
   * 例如: `iptables -t nat -D PREROUTING -s 1.2.3.4 -p tcp --dport 443 -j REDIRECT --to 22`
 * 程序结束退出。
 
+-------
+`iptables` only for IPv4. If need IPv6, Change `iptables` to `ip6tables` .  
+
+因为 `iptables` 只支持ipv4. 如要支持ipv6， 请改 `iptables` 为 `ip6tables` .  
+
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 2020-03-10.   
 end.