Use the DNS - Global window to configure global DNS settings.
On the SBC main screen, go to Configuration > System Provisioning > Category: Base Provisioning > DNS > Servers > DNS > Global. The Global window opens.
Figure 1: DNS - Global Window
Use the following table to configure the options and then click Save.
Table 1: DNS - Global Parameters
Parameter | Description |
|---|---|
Iteration Count | Global DNS iteration count limit for server requests. The value ranges from 0 to 32 and the default value is 8. |
Retransmission Count | Global retransmission count limit for DNS iterations of server requests. The value ranges from 0 to 20 and the default value is 2. |
Retransmission Timer | Global retransmission timer value (in milliseconds) for DNS iterations of server requests. The value ranges from 100 to 10000 and the default value is 500. |
Monitoring Interval | Global monitoring interval (in seconds) for DNS servers. The value ranges from 1 to 300 and the default value is 5. |
Timeouts | Global number of timeouts for blacklisting a DNS server. The value ranges from 0 to 32 and the default value is 0. |
Probe Interval | Global probe interval (in seconds) for blacklisted DNS servers. The value ranges from 1 to 300 and the default value is 5. |
| Edns Payload Size | Global EDNS payload size, in bytes, for DNS servers. The value ranges from 512 to 4096 and the default value is 1280. |
| Edns Retry After | Number of seconds to wait before retrying to establish EDNS support after a failure. The value ranges from 60 to 180 and the default is 180. |
| Edns Failure Count | Maximum number of EDNS failure responses allowed, after which the DNS server is identified as unsupported for EDNS. The value ranges from 1 to 5 and the default value is 3. |
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