Advertising 100.125.0.0/16 route?

1

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.

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Hi Pedro,

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

1 Like
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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?