From 62de02551335d9218ba330072d979630bb5c79bf Mon Sep 17 00:00:00 2001
From: Tim Young <tim.young@lightsys.org>
Date: Fri, 1 Sep 2017 15:51:08 -0500
Subject: [PATCH] do not send packets out if there is no IP address for the nic
 / management interface.

---
 EduNetworkBuilder/NetworkCard.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/EduNetworkBuilder/NetworkCard.cs b/EduNetworkBuilder/NetworkCard.cs
index ce3b134..773bc0c 100644
--- a/EduNetworkBuilder/NetworkCard.cs
+++ b/EduNetworkBuilder/NetworkCard.cs
@@ -707,6 +707,7 @@ namespace EduNetworkBuilder
                         nl = myNet.GetLinkFromID(ConnectedLink);
                         if (nl == null)
                             break;
+                        if (nPacket.sourceIP.GetIPString == NB.ZeroIPString && tPacket.MyType != PacketType.dhcp_request) return false; //We still have no IP.  Do not send the packet out.
                         nPacket.StartOnLink(nl, WhereFrom); //This sends the packet down the link.
                         myNet.addPacket(nPacket);
                         if (tPacket.isFresh)