[SOLVED, user error] Proxmox not conncected to internet, but is reachable on LAN (sopuli.xyz)

submitted 7 months ago* (last edited 7 months ago) by DreadPotato@sopuli.xyz to c/selfhosted@lemmy.world

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[SOLVED] Turns out I'm just a bigger moron than I thought. The MAC address of my server had accidentally been flagged in my router for black listing.

As the title says, my proxmox host is apparently not able to reach the internet anymore, not sure for how long this has been an issue, I rarely work on the host itself. It can ping other devices on my network just fine, and other devices can ping it. I can also SSH in to it and access the web interface. My VMs are connected to the internet without any issues. I don't need to access the host remotely/outside my home network, this is just for updating it etc.

I can't see the host under active devices in my router though.

I have been trying to figure why, but so far without any luck.

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[-] monty33@lemmy.ml 2 points 7 months ago

Sounds like potentially a DNS issue

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

This is what I'm thinking too, but I don't know how to fix it.

[-] MangoPenguin@lemmy.blahaj.zone 3 points 7 months ago

Do you have a nameserver set under System > DNS?

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

It's pointing to the IP of my Adguard (located on a different machine)

[-] sailingbythelee@lemmy.world 1 points 7 months ago

Have you tried setting the nameserver to Google or Cloudflare to see if that works?

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

i have, it doesn't work. I can ping my Adguard without issues though.

[-] sailingbythelee@lemmy.world 1 points 7 months ago

I suppose you have also logged into your Adguard server to verify that it can ping the internet?

In other words, you have successfully pinged Proxmox --> Adguard and Adguard --> Internet?

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

Yes, adguard has access to internet

[-] PlexSheep@feddit.de 2 points 7 months ago

Can you dig @9.9.9.9? If so, its certainly DNS. If it's not DNS, perhaps try to check your iptables iptables -L && iptables -t nat -L.

[-] DreadPotato@sopuli.xyz 0 points 7 months ago

I'm not really sure what to look for, I'm not very experienced in network, but this is the output i get

[-] PlexSheep@feddit.de 3 points 7 months ago

From the output, you don't have any routing rules for your machine that block outgoing traffic. The dig command confirms that you can talk to servers. 9.9.9.9 is a common DNS Server. Based off of this, it seems like your problem is that your system has a bad DNS configuration (it's always DNS).

Can you parhaps cat /etc/resolv.con? This file normally contains the used DNS servers for Linux systems, unless using special software.

[-] DreadPotato@sopuli.xyz 0 points 7 months ago

sure

[-] PlexSheep@feddit.de 1 points 7 months ago

Okay, no external software for DNS management present here. Is that ip a working DNS Server? Is it your server itself perhaps?

[-] DreadPotato@sopuli.xyz 1 points 7 months ago* (last edited 7 months ago)

192.168.68.210 is my adguard, it's on a different machine. It should be working, all my other devices use it and I can see the traffic going through it. My servers IP is 192.168.68.120, and I can't see traffic from that on my adguard at all. But it can ping my adguard.

[-] PlexSheep@feddit.de 1 points 7 months ago

Okay, so if that's your actual DNS Server, can you confirm that it works? dig @yourdns debian.org, for example. Afterwards try to use the default DNS of your system dig debian.org. If both works, your DNS config should be fine. Try a curl debian.org -v too.

debian.org is just a random domain for this, use whatever you want. I don't see anything badly configured so far.

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

as far as i can tell from the output, i think my DNS is working?

[-] BearOfaTime@lemm.ee 1 points 7 months ago

Is the host configured with static IP or DHCP? Either way, verify it has the correct DNS config.

Personally I use static for any device that hosts a service.

What happens if you ping Yahoo.com from the console in Proxmox? It should show the DNS server IP it's using for resolution.

[-] DreadPotato@sopuli.xyz 1 points 7 months ago* (last edited 7 months ago)

It's set to static, I also do that for anything that hosts something.

It won't ping yahoo.com at all, it just reports 100% packet loss.

Edit: just realised that it won't ping my gateway/router either. It's pinging all other devices on my network just fine though.

[-] Phrey@lemmy.sdf.org 1 points 7 months ago

If you can't ping your gateway, then you have a problem with your interface configuration.

Do you need it to be on a specific VLAN or something else?

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

No i haven't split anything in to separate VLANs

[-] billygoat@catata.fish 1 points 7 months ago

can you ping 8.8.8.8?

[-] billygoat@catata.fish 2 points 7 months ago

Not dns then. For some reason you can’t reach the default gateway

[-] DreadPotato@sopuli.xyz 1 points 7 months ago

Nope, same result

this post was submitted on 01 Apr 2024

18 points (90.9% liked)

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