diff --git a/bindings/perl/Sigar.xs b/bindings/perl/Sigar.xs
index 3bd0615f..2c06b02b 100644
--- a/bindings/perl/Sigar.xs
+++ b/bindings/perl/Sigar.xs
@@ -154,6 +154,29 @@ static void boot_Sigar_constants(pTHX)
     XS_SIGAR_CONST_IV(IFF_PROMISC);
     XS_SIGAR_CONST_IV(IFF_ALLMULTI);
     XS_SIGAR_CONST_IV(IFF_MULTICAST);
+
+    XS_SIGAR_CONST_IV(NETCONN_CLIENT);
+    XS_SIGAR_CONST_IV(NETCONN_SERVER);
+    XS_SIGAR_CONST_IV(NETCONN_TCP);
+    XS_SIGAR_CONST_IV(NETCONN_UDP);
+    XS_SIGAR_CONST_IV(NETCONN_RAW);
+    XS_SIGAR_CONST_IV(NETCONN_UNIX);
+
+    XS_SIGAR_CONST_IV(TCP_ESTABLISHED);
+    XS_SIGAR_CONST_IV(TCP_SYN_SENT);
+    XS_SIGAR_CONST_IV(TCP_SYN_RECV);
+    XS_SIGAR_CONST_IV(TCP_FIN_WAIT1);
+    XS_SIGAR_CONST_IV(TCP_FIN_WAIT2);
+    XS_SIGAR_CONST_IV(TCP_TIME_WAIT);
+    XS_SIGAR_CONST_IV(TCP_CLOSE);
+    XS_SIGAR_CONST_IV(TCP_CLOSE_WAIT);
+    XS_SIGAR_CONST_IV(TCP_LAST_ACK);
+    XS_SIGAR_CONST_IV(TCP_LISTEN);
+    XS_SIGAR_CONST_IV(TCP_CLOSING);
+    XS_SIGAR_CONST_IV(TCP_IDLE);
+    XS_SIGAR_CONST_IV(TCP_BOUND);
+    XS_SIGAR_CONST_IV(TCP_UNKNOWN);
+
     XS_SIGAR_CONST_PV(NULL_HWADDR);
 }