ZyXEL Communications LTE4506-M606 - ICMP Screen; ARP Screen

Chapter 6 Router
LTE4506 User’s Guide
66
6.13 ICMP Screen
If an outside user attempts to probe an unsupported port on your LTE4506, an Internet Control Message
Protocol (ICMP) response packet is automatically returned. This allows the outside user to know the
LTE4506 exists. Your LTE4506 supports anti-probing, which prevents the ICMP response packet from being
sent. This keeps outsiders from discovering your LTE4506 when unsupported ports are probed.
Use the following screen to change your LTE4506’s security settings. To access this screen, click Router >
Firewall > ICMP.
Note: If you want your device to respond to pings and requests for unauthorized services, you
will also need to configure the firewall accordingly by disabling SPI. Stateful Packet
Inspection (SPI) tracks each connection crossing the firewall and makes sure it is valid.
Filtering decisions are based not only on rules but also context. For example, traffic from
the WAN may only be allowed to cross the firewall in response to a request from the
LAN.
Figure 42 Router > Firewall > ICMP
The following table describes the labels in this screen.
6.14 ARP Screen
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP address) to
a physical machine address, also known as a Media Access Control or MAC address, on the local area
network.
An IP (version 4) address is 32 bits long. In an Ethernet LAN, MAC addresses are 48 bits long. The ARP
table maintains an association between each MAC address and its corresponding IP address.
Table 33 Router > Firewall > ICMP
LABEL DESCRIPTION
ICMP Settings
Enable WAN
Ping Respond
The LTE4506 will not respond to any WAN incoming Ping requests when Enable WAN Ping
Respond is not selected. Select the check box to reply to incoming WAN Ping requests.
Enable LAN Ping
Respond
The LTE4506 will not respond to any LAN incoming Ping requests when Enable LAN Ping Respond
is not selected. Select the check box to reply to incoming LAN Ping requests.
Apply Click this button to save your changes back to the LTE4506.
Reset Click Reset to reload the previous configuration for this screen.