Author: Joerg Dorchain <joerg@dorchain.net>
Description: Add tcpkill support for handle ppp interfaces.
--- a/pcaputil.c	2011-06-19 17:13:44.419999392 -0500
+++ b/pcaputil.c	2011-06-19 17:15:41.607999368 -0500
@@ -52,6 +52,9 @@
 	case DLT_NULL:
 		offset = 4;
 		break;
+	case DLT_LINUX_SLL:   /* e.g. ppp */
+		offset = 16;
+		break;
 	default:
 		warnx("unsupported datalink type");
 		break;