-extern uschar *proxy_host_address; /* IP of host being proxied */
-extern int proxy_host_port; /* Port of host being proxied */
+extern uschar *proxy_external_address; /* IP of remote interface of proxy */
+extern int proxy_external_port; /* Port on remote interface of proxy */
+extern uschar *proxy_local_address; /* IP of local interface of proxy */
+extern int proxy_local_port; /* Port on local interface of proxy */