diff --git a/tcpip.cc b/tcpip.cc
index fab1af998..e74455311 100644
--- a/tcpip.cc
+++ b/tcpip.cc
@@ -1598,6 +1598,11 @@ char *readip_pcap(pcap_t *pd, unsigned int *len, long to_usec,
   case DLT_LINUX_SLL:
     offset = 16;
     break;
+#endif
+#ifdef DLT_IPNET
+  case DLT_IPNET:
+    offset = 24;
+    break;
 #endif
   default:
     p = (char *) pcap_next(pd, &head);