Chapter 18 Remote management screens 357Nortel Business Secure Router 222 Configuration — BasicsIf an outside user attempts to probe an unsupported port on your Business SecureRouter, an ICMP response packet is automatically returned. This allows theoutside user to know the Business Secure Router exists. The Business SecureRouter series support antiprobing, which prevents the ICMP response packet frombeing sent. This keeps outsiders from discovering your Business Secure Routerwhen unsupported ports are probed.Figure 134 SecurityTable 98 describes the fields in Figure 134.Note: In order to allow Ping on the WAN, you must also configure aWAN to WAN/ Business Secure Router rule that allows PING(ICMP:0)traffic.Table 98 SecurityLabel DescriptionICMP Internet Control Message Protocol is a message control anderror-reporting protocol between a host server and a gateway to theInternet. ICMP uses Internet Protocol (IP) datagrams, but themessages are processed by the TCP/IP software and directlyapparent to the application user.Respond to PingonThe Business Secure Router does not respond to any incoming Pingrequests when Disable is selected. Select LAN to reply to incomingLAN Ping requests. Select WAN to reply to incoming WAN Pingrequests. Otherwise, select LAN & WAN to reply to both incomingLAN and WAN Ping requests.
