Tailscale PVT VPN will not work on the plusnet network

[#1]

@timsansom 

Its as though your router (or linux device) doesnt think that the tailscale IP (192.200.0.109) is outside its LAN subnet and therefore isnt routing via the default gateway.

What is the LAN subnet mask showing on both the router and linux box ? it would normally be /24

[#2]

it would normally be /24

or 255.255.255.0 

if you've got a mask somewhere showing 255.0.0.0 then that will prevent routing to the tailscale IP

[#3]

It could be that it shouldn't be > /24.

However. It could be > /24. (192.168.0.0 -> 192.168.255.255)

It can also be < /24.

[#4]

yes its a class C address /24

[#5]

With traceroute providing strange result.

are you using a virtual machine for this, if so NAT or bridged network interface?

have you setup any routes or just using the devices default gateway?

what does netstat -r (routering table) show?

If you have a Hub two, do you see the same issue?

[#6]

no this is not a VM its a baremetal installation on to a working laptop like i say everything else works a dream just some reason can not get online to tailscale domains and i can figure out why no firewalls etc are on  every other website or domain is absolutely fine but tailscale is a big no no on this debian 13 fresh install  so in theory it should just work out of the box as they say but alas its not its got me scratching my head thats for sure here is the routing table you asked for 

:~$ ip route show
default via 192.168.0.1 dev enp1s0 proto static metric 100
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1
172.18.0.0/16 dev br-f624346eb129 proto kernel scope link src 172.18.0.1
172.19.0.0/16 dev br-b97223c4a5d0 proto kernel scope link src 172.19.0.1 linkdown
172.20.0.0/24 dev br-9fd5de9c5765 proto kernel scope link src 172.20.0.1

192.168.0.0/24 dev enp1s0 proto kernel scope link src 192.168.0.3 metric 100

i am using the TP Link Archer GE800 built in DG  192.x.x.1 and as for having a Plusnet router i refuse to have ISP routers they are that bad its not the router or my set up as this was working fine a few weeks ago so i know its not my set up and nothing has changed except this laptop which had windows 11 on it and after issues with MS and their [-Censored-] software i decided to move it over to debian 13 Linux for stability reasons and not having to deal with MS update issues all the time i am using this laptop as a server for my selfhosting journey  

[#7]

On my TP-Link router found in >Advanced >System >Diagnostics 

Here I can ping and traceroute IP Address/Domain Name

PING login.tailscale.com (192.200.0.116): 64 data bytes
Reply from 192.200.0.116:  bytes=64  ttl=58  seq=1  time=20.702 ms
Reply from 192.200.0.116:  bytes=64  ttl=58  seq=2  time=19.195 ms
Reply from 192.200.0.116:  bytes=64  ttl=58  seq=3  time=20.008 ms
Reply from 192.200.0.116:  bytes=64  ttl=58  seq=4  time=20.015 ms

--- Ping Statistic "login.tailscale.com" ---
Packets: Sent=4, Received=4, Lost=0 (0.00% loss)
Round-trip min/avg/max = 19.195/19.980/20.702 ms
ping is stopped. 

Be interesting if you see the same result?