Chapter 18 Remote Management
The following table describes the labels in this screen.
Table 85 Advanced > Remote Management > ICMP
LABEL | DESCRIPTION |
ICMP | Internet Control Message Protocol is a message control and error- |
| reporting protocol between a host server and a gateway to the Internet. |
| ICMP uses Internet Protocol (IP) datagrams, but the messages are |
| processed by the TCP/IP software and directly apparent to the |
| application user. |
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Respond to | The ZyXEL Device will not respond to any incoming Ping requests when |
Ping on | Disable is selected. Select LAN to reply to incoming LAN Ping requests. |
| Select WAN to reply to incoming WAN Ping requests. Otherwise select |
| LAN & WAN to reply to both incoming LAN and WAN Ping requests. |
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Do not respond | Select this option to prevent hackers from finding the ZyXEL Device by |
to requests for | probing for unused ports. If you select this option, the ZyXEL Device will |
unauthorized | not respond to port request(s) for unused ports, thus leaving the unused |
services | ports and the ZyXEL Device unseen. If this option is not selected, the |
| ZyXEL Device will reply with an ICMP port unreachable packet for a port |
| probe on its unused UDP ports and a TCP reset packet for a port probe |
| on its unused TCP ports. |
| Note that the probing packets must first traverse the ZyXEL Device's |
| firewall rule checks before reaching this |
| Therefore if a firewall rule stops a probing packet, the ZyXEL Device |
| reacts based on the firewall rule to either send a TCP reset packet for a |
| blocked TCP packet (or an ICMP |
| UDP packets) or just drop the packets without sending a response |
| packet. |
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Apply | Click this to save your changes. |
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Cancel | Click this to restore your previously saved settings. |
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