If you use a MikroTik router with a site to site vpn, you must have come across the issue of conditional DNS forwarding. There is a DNS server, which automatically resolves names for sites at the other end of the tunnel. However if you request a DNS record for the domain at the other end, the MikroTik router will try to resolve it via it own DNS server, which obviously does not have the required information. You always have the option to create the entries manually in your hosts file, or add manual entries to your DNS server, however if the number of sites is substantial, this can be a real pain, not to mention the fact that your entries wont be updated in case the DNS records on the server are changed. Oddly MikroTik does not have a straightforward option for conditional DNS forwarding, or the forwarding of DNS requests for a specific domain, to a specific server, however with a bit of command line magic, this can be easily achieved. I will not go into the merits of what each command does what. It is beyond…