diff --git a/network/lib/network/utils.lua b/network/lib/network/utils.lua
index a777bb8..a1e877b 100644
--- a/network/lib/network/utils.lua
+++ b/network/lib/network/utils.lua
@@ -12,7 +12,7 @@ function utils.checksum(data)
 
     --Add left-over byte, if any
     if (count > 0) then
-        sum = sum + string.unpack('>B', data, offset)
+        sum = sum + (string.unpack('>B', data, offset) << 8)
     end
 
     --Fold 32-bit sum to 16 bits
diff --git a/packages/manifest b/packages/manifest
index c0823a6..6cba87b 100644
--- a/packages/manifest
+++ b/packages/manifest
@@ -255,7 +255,7 @@
 	["osinetwork"] = {
 		["manifestVersion"] = "1.0",
 		["package"] = "osinetwork",
-		["version"] = "2.3.0",
+		["version"] = "2.3.1",
 		["name"] = "OSI Network stack",
 		["repo"] = "tree/master/network",
 		["description"] = "A close to official rfc emulation of the OSI layers for OpenOS. Include Ethernet, ARP, ICMP, UDP. Also provide a luasocket libe librairy",
diff --git a/packages/osinetwork.tar b/packages/osinetwork.tar
index e6008bc..06afa0d 100644
Binary files a/packages/osinetwork.tar and b/packages/osinetwork.tar differ
diff --git a/programs.cfg b/programs.cfg
index 5da32fb..6de1097 100644
--- a/programs.cfg
+++ b/programs.cfg
@@ -277,7 +277,7 @@
     note = "Are provided : ping, ifup, ifdown, arp, nc, netstat. Any one of theses tools may be moved to a separate package at any time",
     authors = "AR2000AR",
     repo = "tree/master/network",
-    version = "2.3.0"
+    version = "2.3.1"
   },
   ["dns_common"] = {
     files = {