1 files changed, 4 insertions, 3 deletions
diff --git a/src/ip.go b/src/ip.go
index 3137891..a9685ad 100644
--- a/src/ip.go
+++ b/src/ip.go
@@ -5,9 +5,10 @@ import (
 )
 
 const (
-	IPv4version   = 4
-	IPv4offsetSrc = 12
-	IPv4offsetDst = IPv4offsetSrc + net.IPv4len
+	IPv4version    = 4
+	IPv4offsetSrc  = 12
+	IPv4offsetDst  = IPv4offsetSrc + net.IPv4len
+	IPv4headerSize = 20
 )
 
 const (