Meinberg LANTIME/GPS Operating Instructions Manual page 77

If the DHCP client has been activated, the automatically obtained parameters are
shown in the appropriate fields (IPv4 address, netmask, gateway).
You can specify up to three IPv6 addresses for your LANTIME timeserver.
Additionally you can switch off the IPv6 AUTOCONF feature. IPv6 addresses are
128 bits in length and written as a chain of 16 bit numbers in hexadecimal notation,
separated with colons. A sequence of zeros can be substituted with "::" once.
Examples:
"::" is the address, which simply consists of zeros
"::1" is the address, which only consists of zeros and a 1 as the
last bit. This is the so-called host local address of IPv6 and is
the equivalent to 127.0.0.1 in the IPv4 world
"fe80::0211:22FF:FE33:4455"
is a typical so-called link local address, because it uses
the "fe80" prefix.
In URLs the colon interferes with the port section, therefore IPv6-
IP-addresses are written in brackets in an URL.
("http://[1080::8:800:200C:417A]:80/" ; the last ":80" simply sets
the port to 80, the default http port)
If you enabled the IPv6 protocol, the LANTIME always gets a link local address in
the format "fe80:: ....", which is based upon the MAC address of the interface. If a
IPv6 router advertiser is available in your network and if you enabled the IPv6
AUTOCONF feature, your LANTIME will be set up with up to three link global
addresses automatically.
The next parameter in this sub section is "Netlink mode". This controls the port speed
and duplex mode of the selected Ethernet port. Under normal circumstances, you
should leave the default setting ("autosensing") untouched, until your network
administrator tells you to change it.
High Availability Bonding is the last parameter in this section. The standard moniker
for this technology is IEEE 802.3ad, although it is known by the common names of
trunking, port trunking, teaming and link aggregation. The conventional use of
bonding under Linux is an implementation of this link aggregation. A separate use of
the same driver allows the kernel to present a single logical interface for two physical
links to two separate switches. Only one link is used at any given time. By using
media independent interface signal failure to detect when a switch or link becomes
unusable, the kernel can, transparently to userspace and application layer services, fail
to the backup physical connection. Though not common, the failure of switches,
network interfaces, and cables can cause outages. As a component of high availability
planning, these bonding techniques can help reduce the number of single points of
failure.
At this menu point it is possible to add each Ethernet port to a bonding group. At least
two physical Ethernet ports must be linked to one bonding group to activate this
feature. The first Ethernet Port in one bonding group provides the IP Address and the
net mask of this new virtual device.
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