Network access problems

[craigeben]

A while back I had trouble with my LAN based internet connection via StarLink and as an interim had to install a wireless USB link to get access to the net.
I then lost access to my printers and it seemed like the addition of wlan0 to my eth0 had screwed things up with accessing that network. I didn’t have time to sort and am now back at the point I need to fix this so it does appear to be in a bit of a mess and I’m not sure how to sort this. I couldn’t even understand what the issue was initially but hopefully someone can help me get my head round this.

Blockquote
arp-scan --localnet
WARNING: Could not obtain IP address for interface eth0. Using 0.0.0.0 for
the source address, which may not be what you want.
Either configure eth0 with an IP address, or manually specify the address
with the --arpspa option.
Interface: eth0, type: EN10MB, MAC: e4:1f:13:3f:6a:3a, IPv4: (none)
ERROR: Could not obtain interface IP address and netmask
ERROR: pcap_lookupnet: eth0: no IPv4 address assigned

ip neigh
192.168.1.88 dev wlan0 FAILED
192.168.1.22 dev wlan0 lladdr 14:c1:4e:17:1b:57 STALE
192.168.1.1 dev wlan0 lladdr 74:24:9f:bf:e2:e4 REACHABLE
192.168.1.25 dev wlan0 lladdr 28:6b:35:fd:ea:8a STALE
192.168.1.247 dev wlan0 FAILED
fe80::7624:9fff:febf:e2e4 dev wlan0 lladdr 74:24:9f:bf:e2:e4 router REACHABLE
fe80::7624:9fff:febf:e2e4 dev eth0 lladdr 74:24:9f:bf:e2:e4 router STALE

It seems the local devices are all attached to the wlan0 interface when they should have been on eth0. The wireless link just communicates with the Starlink router and has no connection to the LAN hence why I cannot access anything on the LAN.

Can I run the two connections concurrently?
If so how do I get the eth0 interface back talking to the devices in that 192.168.0.1-255 network?

Thanks

[arvidjaar]

@craigeben

they should have been on eth0

What was not clear in

@craigeben

WARNING: Could not obtain IP address for interface eth0.
...
Interface: eth0, type: EN10MB, MAC: e4:1f:13:3f:6a:3a, IPv4: (none)

How you can expect devices “to be on” an interface without IP address?

@craigeben

Can I run the two connections concurrently?

Yes, although it won’t necessarily do what you expect or hope.

@craigeben

how do I get the eth0 interface back talking to the devices in that 192.168.0.1-255 network?

At the very least you need to configure address in this network on the eth0.

P.S. your post is unreadable. Always use preformatted text when posting computer output.

[craigeben]

Not really helpful to be honest. Sorry about the formatting, I previewed and it was well formatted on my screen but point taken.

Just so this is clear, I have a simple home LAN that is 100% wired with printers and other machines all linked via a switch. IP addresses are obtained via DHCP and the internet connection via Starlink Router through the ethernet adapter accessory.

The Wifi link is also using the Starlink router for connectivity and DHCP assigned addresses.

Whilst I’d like to understand exactly what the problem is here I just need a working system where I can use my printers and other devices while still able to connect to the internet.

I have swapped to Network Widget from Wicked to see if I can figure out what may not be set correctly.

[deano_ferrari]

Are you using Network Manager to manage your network config?

Show us your current IP configuration

ip a

ip r

[craigeben]

I have set connect automatically with priority to 1 for eth0 and on the IPv4 tab set the method to Automatic. I suspect that was actually the issue and I have no idea how that got turned off.
Printed a test page and will watch performance to see how this actually operates. Couple of screen shots so if anyone is doing similar they should see something along these lines.