Appendix
AX3000 Models 90 - User's Manual 265
response is treated as a valid response (positive or negative).
The AX3000 requests a recursive search to the DNS servers (and not iterative
search). This means that the DNS server must search itself for a DNS server
which is able to resolve the required name.
The resolution operation depends on the number of DNS servers. These are the
steps for a one-server resolution and a two-server resolution.
One DNS Server:
1 - A DNS request is sent to the server.
2 - In event of no response, this request is sent again (4 times max.).
3 - In event of negative answer, the resolution is aborted.
4 - If other requests can be sent (default DNS domains are defined), go
back to step 1.
Two DNS Servers:
1 - A DNS request is sent to the server 1.
2 - In event of no response from server 1, this request is sent to the server
2.
3 - In event of no response from server 2, go back to step 1 (4 times max.).
4 - In event of negative answer from any server, the resolution is aborted.
5 - If other requests can be sent (using default DNS domains are defined),
go back to step 1.
Example: looking at the screen shots of the Chapter 3.1, these are the DNS
requests sent to resolve "as400" with 2 DNS servers and 2 default DNS
domains (of course this process is stopped if one DNS server sends back a
positive response):
- "as400.servers.axel.com" to DNS server 1
- "as400.servers.axel.com" to DNS server 2
- "as400.terminals.axel.com" to DNS server 1
- "as400.terminals.axel.com" to DNS server 2
- "as400" to DNS server 1
- "as400" to DNS server 2
c) Messages Displayed on the AX3000 Screen
To open a session the AX3000 must resolve the host name (if no IP address
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