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Specifications
4
Specifications
4.1
IP ACL
IP Access Control List
The IP Access Control List (ACL IP) is a filter for incoming IP packets. If the filter is
active, only the hosts and subnets whose IP addresses are registered in the list, can
contact via HTTP or SNMP, and make changes. For incoming connections from unau-
thorized PCs, the device is not completely transparent. Due to technical restraints, a
TCP/IP connection will be accepted at first, but then rejected directly.
Examples:
Entry in the IP ACL
192.168.0.123
192.168.0.1/24
1234:4ef0:eec1:0::/64
If you choose a wrong IP ACL setting and locked yourself out, please activate the
Bootloader Mode and use GBL_Conf.exe to deactivate the IP ACL. Alternatively, you
can reset the device to factory default.
4.2
IPv6
IPv6 Addresses
IPv6 addresses are 128 bit long and thus four times as long as IPv4 addresses. The
first 64 bit form a so-called prefix, the last 64 bit designate a unique interface identifier.
The prefix is composed of a routing prefix and a subnet ID. An IPv6 network interface
can be reached under several IP addresses. Usually this is the case under a global ad-
dress and the link local address.
Address Notation
IPv6 addresses are noted in 8 hexadecimal blocks at 16 bit, while IPv4 normally is
noted in decimal. The seperator is a colon, not a period.
E.g.: 1234:4ef0:0:0:0019:32ff:fe00:0124
Leading zeros may be omitted within a block. The previous example can be rewritten
as:
1234:4ef0:0:0:19:32ff:fe00:124
One may omit one or more successive blocks, if they consist of zeros. This may be
done only once within an IPv6 address!
1234:4ef0::19:32ff:fe00:124
Meaning
the PC with IP Address "192.168.0.123" can access the device
all devices of subnet "192.168.0.1/24" can access the device
all devices of subnet "1234:4ef0:eec1:0::/64" can access the device
34
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