I replaced ZeroTier with Tailscale, easy install, all worked well until I tried to access another PC on my LAN... and I could not. I eventually figured out that BitDefender firewall was blocking LAN traffic when Tailscale was active. Turning off either Bitdefender or Tailscale fixed it, but if both were on, no LAN.
The fix, for anyone trying to do the same is:
In BitDefender, Go to "Protection": "Firewall", "Settings". Select the "Rules" Tab, then "Add Rule" near top right in blue.
That opens a "Create Rule" box. Select the "Apply this rule to all applications " button (on) . Permission "ALLOW"
Network Type "Any Network", Protocol "ANY", Direction "BOTH".
Select "Show advanced settings".
Turn on "CUSTOM REMOTE ADDRESS"
The IP should be "100.69.0.0/10" Use this address regardless of the actual IP of Tailscale on that PC, or your PC's IP, or anything else. (this IP represents all IP's that Tailscale uses)
No ports need to be entered here.
Save and close Bitdefender.
Do the same thing on each computer on your LAN that uses Bitdefender.
That should enable LAN access with Bitdefender and Tailscale running.
The fix, for anyone trying to do the same is:
In BitDefender, Go to "Protection": "Firewall", "Settings". Select the "Rules" Tab, then "Add Rule" near top right in blue.
That opens a "Create Rule" box. Select the "Apply this rule to all applications " button (on) . Permission "ALLOW"
Network Type "Any Network", Protocol "ANY", Direction "BOTH".
Select "Show advanced settings".
Turn on "CUSTOM REMOTE ADDRESS"
The IP should be "100.69.0.0/10" Use this address regardless of the actual IP of Tailscale on that PC, or your PC's IP, or anything else. (this IP represents all IP's that Tailscale uses)
No ports need to be entered here.
Save and close Bitdefender.
Do the same thing on each computer on your LAN that uses Bitdefender.
That should enable LAN access with Bitdefender and Tailscale running.
