diff --git a/scapy/config.py b/scapy/config.py
index 6c32d6d61bf64c2207572f739d9c0e57ae72ccfc..95fb43d2c028e51efa2c5722bce55cb61f7a6128 100755
--- a/scapy/config.py
+++ b/scapy/config.py
@@ -363,8 +363,8 @@ extensions_paths: path or list of paths where extensions are to be looked for
     resolve = Resolve()
     noenum = Resolve()
     emph = Emphasize()
-    use_pcap = False
-    use_dnet = False
+    use_pcap = os.getenv("SCAPY_USE_PCAPDNET", "").lower().startswith("y")
+    use_dnet = os.getenv("SCAPY_USE_PCAPDNET", "").lower().startswith("y")
     use_winpcapy = False
     ipv6_enabled = socket.has_ipv6
     ethertypes = ETHER_TYPES