Appendix
262 AX3000 Models 90 - User's Manual
If after these two minutes, the re-negotiation has still failed, an error box is
displayed and all current sessions (telnet, tty, lpd, etc.) are closed (i.e. lost). And
the thin client is shutdown.
Note: the AX3000 Trace Mode allows a trace of data exchanged between the
AX3000 and the DHCP server (see Chapter 3.1). This is useful to diagnose
problems.
A.4 - THE DNS PROTOCOL
The DNS protocol (Domain Name System) allows names to be 'resolved' by the
AX3000. Resolving is retrieving an IP address associated with a name.
A.4.1 - Overview
A domain (computer network) can be considered as a tree, with branches
(nodes) such as hubs, switches, routers, print servers etc, and leafs, for
example PCs, thin clients and printers.
The domain system makes no distinction between the use of interior nodes and
leafs, and this documentation uses the term "nodes" to refer to both. (I.e. any
network resource).
Each node has a name (Label) which must be unique to other nodes at the
same level, but not necessarily unique within the whole network.
Label syntax:
- Permissible characters are letters (a..z to A..Z), numbers (0..9) and the
hyphen (-).
- A Label must begin by a letter and be ended by a letter or a number.
- The resolution is not case-sensitive.
The domain name of a node is the list of the labels on the path from the node to
the root of the tree. A dot is used to separate each label. Two types of host
names can be distinguished within the AX3000:
- A full name: one or more dots are included in the name.
Example: "www.axel.com"
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