Context:
- My DNS cache is disabled at the client side
- Ping6 using DNS to resolve IPv6 addresses
- Server is multi-homed with 2 upstream service providers i.e. two prefixes
- I am running Ubuntu 16.04 LTS
Issue:
Let's say we have a net1.example.com, and net2.example.com attached to the same server who DNS addresses can be obtained from the client. Client runs the following command
ping6 net1.example.com
and it pings the server using the provided IPv6 server address. But when I run
ping6 net2.example.com
it uses the older IPv6 address to echo.
Remember there is no caching at the client at all (nscd, named, systemd-resolvd, dnsmasq etc all off).
If I restart the system, and then I switch the above commands sequence, it follows the same thing i.e. it uses the first commands' obtained IPv6 addresses everytime I call ping6 with the other sub-domain name.
Any ideas why might it be doing like this? It happens if I use the curl etc as well.
Cheers, K.
