Chapter 17 Remote Management
"If you want your device to respond to pings and requests for unauthorized services, you may also need to configure the firewall anti probing settings to match.
Figure 151 Advanced > Remote Management > ICMP
The following table describes the labels in this screen.
Table 96 Advanced > Remote Management > ICMP
LABEL | DESCRIPTION |
ICMP | Internet Control Message Protocol is a message control and |
| 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 Ping | The ZyXEL Device will not respond to any incoming Ping requests when Disable is |
on | 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 to | Select this option to prevent hackers from finding the ZyXEL Device by probing for |
requests for | unused ports. If you select this option, the ZyXEL Device will not respond to port |
unauthorized | request(s) for unused ports, thus leaving the unused ports and the ZyXEL Device |
services | 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 |
| 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 port- |
| unreachable packet for a blocked 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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