Axel AX3000 65 User's Manual - firmware 0632 - Manual (Page 246)

Appendix
232
AX3000 - User's Manual
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 has been sent and no positive response has been received (failure:
the name is not resolved).
The order of the requests sent to resolve a hostname is called the resolution
strategy.
The resolution strategy depends on both:
- Whether or not a domain name is declared,
- Whether the name to resolve is complete.
If no default DNS domain is defined in the AX3000 Set-Up, the resolution is
done with the name itself regardless of whether the name is full or not.
If one or more default DNS domains are defined, the resolution strategy
depends on the name:
- Full name: the resolution is first done with this name. If unsuccessful new
resolutions are performed by concatenating the full name with the defined
DNS domains.
- Incomplete Name: the resolutions are first done with the defined default
DNS domains. If unsuccessful a new resolution is performed with this
incomplete name.
Example of name resolutions: looking at the host table in Chapter 3.1.3 the
name resolution attempts are:
- as400: this is not a full name, the resolution is first made with the first
DNS domain (as400.servers.axel.com). Then, in event of failure, with the
second DNS domain (as400.terminals.axel.com). Then, in event of
failure, the resolution is made with the name itself (as400).