Chapter 23 Remote Management Configuration
Figure 183 Remote Management: ICMP
The following table describes the labels in this screen.
Table 131 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. By default this option is not selected and 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 |
| mechanism before reaching this |
| mechanism blocks a probing packet, the ZyXEL Device reacts based on the |
| corresponding firewall policy to send a TCP reset packet for a blocked TCP packet |
| or an ICMP |
| packets without sending a response packet. |
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Apply | Click Apply to save your customized settings and exit this screen. |
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Cancel | Click Cancel to begin configuring this screen afresh. |
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