Axel AX3000 80WMS, Руководство пользователя

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Appendix
AX3000 Model 80WMS - User's Manual
107
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"
- An incomplete name : no dots are used. The resolution procedure
concatenates another character string to this name (the default DNS
domain name). For more information see Chapter 3.1.2.
Example: "as400" is concatenated with "servers.axel.com" to create a full
name of "as400.servers.axel.com"
A host name is only resolved if the IP address is needed. (I.e. to open a session
or to ping).
Note : a name is resolved for each connection attempt, even if its IP address has
been obtained by a previous resolution.
A.4.2 - Resolving a Name
a) Resolution Strategy
To resolve a name, a DNS request is sent by the AX3000. A DNS request
contains the destination DNS server IP address and the name to be resolved.
To resolve a name possibly more than one DNS request is needed (if one or
more default DNS domains are defined). The resolution process is stopped
either when the AX3000 receives a positive response from a DNS server
(success: an IP address is associate to this name) or when all the DNS requests