Chapter 63 System
ZyWALL Series CLI Reference Guide
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63.5 Console Port Speed
This section shows you how to set the console port speed when you connect to the Zyxel Device via the
console port using a terminal emulation program. The following table describes the console port
commands.
You must use the configure terminal command to enter the configuration mode
before you can use these commands.
63.6 DNS Overview
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and vice
versa. The DNS server is extremely important because without it, you must know the IP address of a
machine before you can access it.
63.6.1 Domain Zone Forwarder
A domain zone forwarder contains a DNS server’s IP address. The Zyxel Device can query the DNS server
to resolve domain zones for features like VPN, DDNS and the time server. A domain zone is a fully
qualified domain name without the host. For example, zyxel.com.tw is the domain zone for the
www.zyxel.com.tw fully qualified domain name.
A name query begins at a client computer and is passed to a resolver, a DNS client service, for
resolution. The Zyxel Device can be a DNS client service. The Zyxel Device can resolve a DNS query
locally using cached Resource Records (RR) obtained from a previous query (and kept for a period of
time). If the Zyxel Device does not have the requested information, it can forward the request to DNS
servers. This is known as recursion.
The Zyxel Device can ask a DNS server to use recursion to resolve its DNS client requests. If recursion on
the Zyxel Device or a DNS server is disabled, they cannot forward DNS requests for resolution.
A Domain Name Server (DNS) amplification attack is a kind of Distributed Denial of Service (DDoS)
attack that uses publicly accessible open DNS servers to flood a victim with DNS response traffic. An
show clock date
Displays the current date of your Zyxel Device.
show clock status
Displays your time zone and daylight saving settings.
show clock time
Displays the current time of your Zyxel Device.
show ntp server
Displays time server settings.
Table 293 Command Summary: Date/Time (continued)
COMMAND DESCRIPTION
Table 294 Command Summary: Console Port Speed
COMMAND DESCRIPTION
[no] console baud baud_rate
Sets the speed of the console port. The no command resets the console port speed
to the default (115200).
baud_rate: 9600, 19200, 38400, 57600 or 115200.
show console
Displays console port speed.
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