diff --git a/HowtoOpenVPN.md b/HowtoOpenVPN.md
index 961e11c6..fe790f93 100644
--- a/HowtoOpenVPN.md
+++ b/HowtoOpenVPN.md
@@ -414,7 +414,25 @@ username-as-common-name
 Le répertoire `/etc/openvpn/ccd/` contient des fichiers avec les _Common Name_ et contenant les adresses IP fixés ainsi :
 
 ~~~
-ifconfig-push 172.16.1.1 255.255.0.0
+ifconfig-push 172.16.1.1 172.16.1.2
+~~~
+
+Les IPs que l'on peut mettre doivent être prises selon des paires spécifiques, que l'on peut voir sur [la documentation OpenPVN](https://openvpn.net/community-resources/how-to/#configuring-client-specific-rules-and-access-policies) :
+
+~~~
+[  1,  2] [  5,  6] [  9, 10] [ 13, 14] [ 17, 18]
+[ 21, 22] [ 25, 26] [ 29, 30] [ 33, 34] [ 37, 38]
+[ 41, 42] [ 45, 46] [ 49, 50] [ 53, 54] [ 57, 58]
+[ 61, 62] [ 65, 66] [ 69, 70] [ 73, 74] [ 77, 78]
+[ 81, 82] [ 85, 86] [ 89, 90] [ 93, 94] [ 97, 98]
+[101,102] [105,106] [109,110] [113,114] [117,118]
+[121,122] [125,126] [129,130] [133,134] [137,138]
+[141,142] [145,146] [149,150] [153,154] [157,158]
+[161,162] [165,166] [169,170] [173,174] [177,178]
+[181,182] [185,186] [189,190] [193,194] [197,198]
+[201,202] [205,206] [209,210] [213,214] [217,218]
+[221,222] [225,226] [229,230] [233,234] [237,238]
+[241,242] [245,246] [249,250] [253,254]
 ~~~
 
 ### Authentification via Radius