Ubuntu Server cant Be Accessed Over IP or SHH But CloudFlare Tunnel Works Fine

[rahulsharma49]

Hello All,

I am having this strange issue, after running for sometime, my Ubuntu server cant be accessed over local IP, cant SSH, cant reach any service like radarr, Jellyfin or so, unless i restart it.
But i am using Cloudflare tunnel so that if i am out of my home, so i can reach it, and it works fine even when i cant access services locally.
Means I cant reach Jellyfin from local IP but I can reach it via Cloudflare tunnel and it works perfectly fine, same goes with other services.
P.S. my server is over WiFi

[currentshaft]

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[rahulsharma49]

Hello,

Thanks for your reply

What more information you need?

Here is my /etc/netplan/50-cloud-init.yaml

network:
version: 2
ethernets:
enp0s31f6:
dhcp4: true
wifis:
wlp1s0:
access-points:
"MySSID":
password: "MyPassword"
addresses:
- 10.0.0.100/8
nameservers:
addresses: [8.8.8.8]
routes:
- to: default
via: 10.0.0.1




My router IP is 10.0.0.1 and subnet mask on router is 255.255.0.0.

What troubleshooting have you already performed to rule out Cloudflare or your local router?

I am clueless where to start and what to check

[TheFu]

You need to edit that yaml file to ensure forum code tags are used or it is useless for us to review. YAML is space sensitive.

[rahulsharma49]

Here you go,

network:    version: 2
    ethernets:
        enp0s31f6:
            dhcp4: true
    wifis:
        wlp1s0:
            access-points:
                "MySSID":
                    password: "MyPass"
            addresses:
            - 10.0.0.100/8
            nameservers:
                addresses: [8.8.8.8]
            routes:
            - to: default
              via: 10.0.0.1

Just asking, is addresses field with 10.0.0.100/8 correct?

[TheFu]

Just asking, is addresses field with 10.0.0.100/8 correct?

Unlikely. Most home subnets allow 256 hosts, so /24 would be correct.
The indentation of the wifi part looks wrong to me, but I don't use wifi except on laptops and never use netplan to configure it. Sorry.

YAML is extremely indentation sensitive, in addition to all the other picky things about it.
https://netplan.readthedocs.io/en/stable/examples/ has examples of a correct wifi config for different security levels.

Because I don't know your network at all, I can only guess that this is the example you want to follow:

network:
  version: 2
  renderer: networkd
  wifis:
    wlp2s0b1:
      dhcp4: no
      dhcp6: no
      addresses: [192.168.0.21/24]
      nameservers:
        addresses: [192.168.0.1, 1.0.0.1]
      access-points:
        "network_ssid_name":
          password: "**********"
      routes:
        - to: default
          via: 192.168.0.1

The stuff in red is what I think you'll need to change, assuming WPA of some sort is used.

[rahulsharma49]

tried the above yaml file and my server goes out of network, switced back to old yaml and now it is connected again

[TheFu]

tried the above yaml file and my server goes out of network, switced back to old yaml and now it is connected again

• If you don't show your work, how can anyone help?
• Did you change all the red parts in the example?
• Did you do the 2 netplan commands for the YAML to be generated and applied?

It broke, isn't very descriptive. We cannot read minds.

The subnet with that gateway aren't typical for .... anyone. That /8 subnet is something Google or China might use on their main, huge, gateway routers, not a small business or home user. I suspect very few enterprises would have a /8 subnet either. Typically, a medium-sized business would use a /20 netmask, but you need to know the "correct" answer. We can't tell you. Ask your network guys.

[rahulsharma49]

sry for last reply, after couple of restart it is now working, i dont know how but it is working now.

If you don't show your work, how can anyone help?

What work i need to show, please tell

 That /8 subnet is something Google or China might use on their main, huge, gateway routers, not a small business or home user

My router configuration has subnet mask as 255.255.0.0, does it matter or it is correct?

[currentshaft]

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