ZyXEL Communications P-870HW-I User Manual

P-870HW-I1 User’s Guide

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Chapter 16 Remote MGMT

Each field is described in the following table.

Use this screen to control SSH access to your ZyXEL Device. To open this screen, click 
Management > Remote MGMT > SSH.

Figure 122   Management > Remote MGMT > SSH

Table 100   Management > Remote MGMT > Security

Respond to Ping 

on

Select the interface(s) on which the ZyXEL Device should respond to incoming 

ping requests.
Disable - the ZyXEL Device does not respond to any ping requests.
LAN - the ZyXEL Device only responds to ping requests received from the LAN.
WAN - the ZyXEL Device only responds to ping requests received from the WAN.
LAN & WAN - the ZyXEL Device responds to ping requests received from the LAN 

or the WAN.

Do not respond to 

requests for 

unauthorized 

services

Select this to prevent outsiders from discovering your ZyXEL Device by sending 

requests to unsupported port numbers. If an outside user attempts to probe an 

unsupported port on your ZyXEL Device, an ICMP response packet is 

automatically returned. This allows the outside user to know the ZyXEL Device 

exists. Your ZyXEL Device supports anti-probing, which prevents the ICMP 

response packet from being sent. This keeps outsiders from discovering your 

ZyXEL Device when unsupported ports are probed.
If you clear this, your ZyXEL Device replies with an ICMP Port Unreachable packet 

for a port probe on unused UDP ports and with a TCP Reset packet for a port 

probe on unused TCP ports. 

Apply

Click this to save your changes and to apply them to the ZyXEL Device.

Reset

Click this to set every field in this screen to its last-saved value.