Advertising 100.125.0.0/16 route?

Hi I am currently experimenting with setting up an Ubuntu server which I want to use as a subnet router for a 10.0.2.0/24 route, and got that working without any issues. The next step would be to configure split DNS for a private hosted zone, so that all machines on our tailnet can resolve internal hostnames. However our cloud provider uses 100.125.4.25 and 100.125.129.199 for their private DNS server, and advertising a 100.125.0.0/16 route doesn’t seem to work, probably because it collides with the 100.64.0.0/10 subnet used by tailscale. Is there any solution to this issue?

Thanks,
Pedro.

Hi Pedro,

You can disable ipv4, and only use ipv6 on your tailnet, which will remove the conflict with the 100.x CIDR

Thanks Jay! Unfortunately when I set the disableIPv4 flag to true on the ACL, the 10.0.2.0/24 route stops working. Am I doing something wrong?