ZyXEL Communications 400, User Manual

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Gateway 400 User Guide | Configuration
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5.6 Network
The Gateway 400 features two Gigabit Ethernet LAN ports, operated in dual mode, which enables
you to set up your own broadband home network. You can, for instance, manage two separate net-
works connected to a single router.
This screen dialog gives you an overview of the current network settings and network devices con-
nected.
5.6.1 LAN
The Gateway 400 allows you to use network addresses in one of two possible formats: the proven
32-bit legacy format Internet Protocol Version 4 (
IPv4 ) or the new 128-bit format Internet Protocol
Version 6 ( IPv6 ). It is up to you to decide which protocol you want to use, depending on the individ-
ual circumstances.

IPv4
IPv4 addresses are typically written in four blocks of decimal numbers: for example,
192.168.100.1. Each block uses 8 bits, thus representing a range of values from 0 to 255.
IP addresses are divided into two parts: a network part and a host part. Computers can only
communicate directly with each other if the network part of their IP address is the same. In the
same network, no host address may be assigned twice. The division into network part and ad-
dress part is determined by the subnet mask (e.g., 255.255.255.0). In CIDR notation, this is
written as 192.168.100.22/24, where /24 means that the first 24 bits (starting from the left)
of the subnet mask are equal to 1.
Example:

IPv6
The new IPv6 addresses are written in eight 16-bit hexadecimal blocks, delimited by a colon.
Leading zeros can be omitted from the address in the same way as before. Furthermore, blocks
whose value is 0 (or 0000) can be omitted.
Example of equivalent notations:
2001:0db8:1a2b:0815:0000:0000:1a2f:0011
2001:db8:1a2b:815:0:0:1a2f:11
2001:db8:1a2b:815::1a2f:11
Network part Host Network part Host part
IP Address 192.168.100. 22 > 11000000.10101000.01100100. 00010110
Subnet mask 255.255.255. 0 > 11111111.11111111.11111111. 00000000