Chapter 34 Object
ZyWALL ATP Series User’s Guide
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The following table describes the labels in this screen.
34.7 Service Overview
Use service objects to define TCP applications, UDP applications, and ICMP messages. You can also
create service groups to refer to multiple service objects in other features.
• Use the
Service
) to view and configure the Zyxel Device’s list of
services and their definitions.
• Use the
Service Group
) to view and configure the Zyxel Device’s
list of service groups.
34.7.1 What You Need to Know
IP Protocols
IP protocols are based on the eight-bit protocol field in the IP header. This field represents the next-level
protocol that is sent in this packet. This section discusses three of the most common IP protocols.
Computers use Transmission Control Protocol (TCP, IP protocol 6) and User Datagram Protocol (UDP, IP
protocol 17) to exchange data with each other. TCP guarantees reliable delivery but is slower and more
complex. Some uses are FTP, HTTP, SMTP, and TELNET. UDP is simpler and faster but is less reliable. Some
uses are DHCP, DNS, RIP, and SNMP.
TCP creates connections between computers to exchange data. Once the connection is established,
the computers exchange data. If data arrives out of sequence or is missing, TCP puts it in sequence or
waits for the data to be re-transmitted. Then, the connection is terminated.
In contrast, computers use UDP to send short messages to each other. There is no guarantee that the
messages arrive in sequence or that the messages arrive at all.
Table 264 Geo IP > Add
LABEL
DESCRIPTION
Country
Select the country or region that maps to this IP address.
Address Type
Select the type of address you want to create. Choices are:
HOST
,
RANGE
,
SUBNET
.
IP Address
This field is only available if the
Address Type
is
HOST
. This field cannot be blank. Enter the IP
address that this address object represents.
IP Starting
Address
This field is only available if the
Address Type
is
RANGE
. This field cannot be blank. Enter the
beginning of the range of IP addresses that this address object represents.
IP Ending Address This field is only available if the
Address Type
is
RANGE
. This field cannot be blank. Enter the end
of the range of IP address that this address object represents.
Network /
Netmask
These fields are only available if the IPv4
Address Type
is
SUBNET
. They cannot be blank. Enter
the network IP and subnet mask that defines the IPv4 subnet.
IPv6 Address
Prefix
This field is only available if the IPv6
Address Type
is
SUBNET
. This field cannot be blank. Enter the
IPv6 address prefix that the Zyxel Device uses for the LAN IPv6 address.
OK
Click
OK
to
save your changes back to the Zyxel Device.
Cancel
Click
Cancel
to exit this screen without saving your changes.
