--- tcpip.c.orig	Tue Aug  3 00:29:31 1999
+++ tcpip.c	Wed Sep  1 12:12:30 1999
@@ -773,6 +773,7 @@
  switch(datalink) {
  case DLT_EN10MB: offset = 14; break;
  case DLT_IEEE802: offset = 22; break;
+ case DLT_LOOP:
  case DLT_NULL: offset = 4; break;
  case DLT_SLIP:
 #ifdef DLT_SLIP_BSDOS
@@ -799,6 +800,7 @@
 #endif /* if freebsd || openbsd || netbsd || bsdi */
    break;
  case DLT_RAW: offset = 0; break;
+ case DLT_ENC: offset = 12; break;
  default: fatal("Unknown datalink type (%d)", datalink);
  }