--- natd.c.orig	Tue Jun 10 11:11:28 2003
+++ natd.c	Tue Jun 10 11:35:59 2003
@@ -131,6 +131,7 @@
 	struct sockaddr_in	addr;
 	fd_set			readMask;
 	int			fdMax;
+	int			proxy_only;
 /* 
  * Initialize packet aliasing software.
  * Done already here to be able to alter option bits
@@ -170,7 +171,9 @@
 /*
  * Check that valid aliasing address has been given.
  */
-	if (aliasAddr.s_addr == INADDR_NONE && ifName == NULL)
+
+	proxy_only = (PacketAliasSetMode(0,0) & PKT_ALIAS_PROXY_ONLY);
+	if (aliasAddr.s_addr == INADDR_NONE && ifName == NULL && !proxy_only)
 		errx (1, "aliasing address not given");
 
 	if (aliasAddr.s_addr != INADDR_NONE && ifName != NULL)