I recently enabled DNS Proxy on my Balance One (up to date firmware). After a while, one of the local web sites starts failing to resolve to an IP address with a “site not found” error or “SERVFAIL” when testing with IP utilities on Mac OS X. I confirmed that the site was propagating DNS correctly with some “is it up” type internet utilities and through my work laptop which could resolve it.
To make it interesting, I had been using quad9.net recursive name servers (188.8.131.52). The action that fixes this issue is to (a) disable DNS Caching.
Is there a utility that allows one to see DNS queries, success rate, etc.? Any idea why this individual site might become corrupted in the cache? I know it is on a shared Apache server and on a shared IP address (www.shannondale.org).