I am relatively new to the FreePBX and ClearlyIP community. As I have been adding FreePBX boxes, I have noted that my DNS usage is going up significantly (I use an IP Anycast DNS provider for name resolution).
Whats got me scratching my head is that when I add a server in a given area, I start getting traffic not from the box itself or even the box’s DNS server, but a server on that network. Presumably in its path. (I say this because when I look at the logging from the DNS system, it shows the source IP addresses, and they are not of the box or even the box’s DNS server, but similar provider or location)
The DNS queries (and the reason for me asking) are malformed. They end up with not getting a reply, so they keep re-trying.
A query might look like this :
The latter one looks like an IP address in CIDR notation but with a domain attached to the end. It is very perplexing and Im trying to figure out what might be causing this.
Has anyone heard of this behaviour in either FreePBX or Asterisk?
Right now I am getting in the neighborhood of 450+ NX domain lookups in a 5 minute period.