Appendix
AX3000 Model 80WMS - User's Manual 109
If a DNS server sends back a positive response, then the IP address is found
and the resolution operation is completed. If not two cases of failure are
possible:
- Receiving a negative response: the name is not known by this DNS
server. The AX3000 will retry with a new DNS request or with the second
DNS server.
- No response (time-out): after a few seconds the DNS server has not
sent back a response. The AX3000 resends the same request to the DNS
server.
Note: after 4 time-out errors on the same DNS server, this server is
"removed" from the resolution operation.
Note: if a response previously considered as a time-out error is received, this
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
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