AS number check
Prerequisites:
The DNS server IP is registered in the AS numbers database.
Package:
Availability.
Executed on:
CYMRU DNS servers.
Check interval:
Every 4 hours.
Impact on Availability:
None.
Impact on Integrity:
None.
Purpose
Informational/indicational only.
To collect and present the AS numbers each individual DNS IP is registered to.
The individual AS numbers collected for each name server IP address is then fed to the AS number summary check which looks for diversity between the AS numbers.
Event severities and messages
This check will not result in any severities.
Solutions, tips & tricks
When designing a DNS infrastructure, it is usually good practice to split the DNS servers between two (or more) different AS numbers for reasons of resiliency.