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Classification need with Tailscale, remote access, and local access. (aussie.zone)

submitted 5 days ago* (last edited 5 days ago) by gazter@aussie.zone to c/selfhosted@lemmy.world

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I encountered something I don't quite understand, and I was hoping someone could enlighten me.

I set up Tailscale on my router with subnets, so I could remotely access my home network. This worked great. Then, at home, I was happily browsing the internet on my main PC, and decided to dial into another machine on my network. It couldn't access it at all. Disconnecting Tailscale on my main PC restored lconnectivity.

I don't understand what is happening here- the only thing I can think of is that my internet traffic was being routed through Tailscale, but I don't have an exit node.

TL,DR: home PC sees Internet but not LAN when connected to Tailscale, why and how fix?

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[–] gazter@aussie.zone 1 points 5 days ago (2 children)

The router is set as a subnet router, that is how I am able to access other machines on my lan remotely.

I don't want to, and sometimes can't, install tailscale on every device I want remote access to.

So I may have duplicate routes- Does that explain the behaviour in my original post? And how would I go about avoiding that?

I could turn off subnet routing, and only turn it on when needed, but I'll be putting up a bunch of other services that will want to talk to each other- I'm assuming this will break whenever I turn subnet routing on.

[–] Onomatopoeia@lemmy.cafe 1 points 2 days ago

Just verifying, after enabling subnet routing, did you create the routes (it's in the docs for subnet router).

I have the same problem you do - for some reason TS will "steal" the route, even when correctly configured.

[–] just_another_person@lemmy.world 2 points 5 days ago

Yes, if Tailscale on your router is advertising routes, and your other devices while connected to Tailscale are picking up those advertised routes, they won't be able to figure out how to get to your local network devices if both things are advertising the same routes.