No NAT reflection for Virtual IP - DNS not applicable
I have a webstie (and ssh) on a server with just a public IP address. There is no DNS entry. We access via the bare IP address only.
I set up NAT reflection for that IP so that the internal machines can access it.
I have two internal networks/subnets that get routed. One is the 'main' subnet and the other is handled via a virtual IP.
- Access from outside is just fine.
- Reflection to the main internal subnet is just fine.
- Reflection to the virtual IP's internal subnet doesn't work - mostly. See below.
For our websites with DNS entries, all the NAT reflection works just fine for both subnets.
I would have set up split DNS except that we have a site without DNS...
Here is the "below" part: If I make certain trivial changes, for example changing back and forth between Pure NAT to NAT + Proxy, reflection for the internal VIP subnet works for just a few seconds. Then, it stops.
I set up logging for the relevant firewall rule, but I don't see anything relevant in the logs.