Networking stopped functioning

Hello there,
I have a freshly installed RL 9.4 I am preparing to create and install a KVM-based VM on. It worked fine until yesterday, when it suddenly lost connectivity with the “outer world” and cannot ping any other node. The nmcli reports everything UP, however. I checked the firewall (just in case) - it’s not it. I restarted everything I could think of - including the router connecting the server to the network. Nothing helped.
Below is the nmcli output:


Where else should I look? What could happen?
I will greatly appreciate your help!

Did you properly check your network setup? Can you ping your router? Do you use static IP addresses and the same address has been given to another machine? You can check the arp cache on your router if it resolves to your MAC address.

Hi hs303, I have static IP addresses for this Linux box, and my gateway, as well as for my network server. Moreover, like I mentioned everything was working fine until two days ago. As of now The only addresses I can ping are the loopback (127.0.0.1) and system’s own address.
Anyway, thank you! I will appreciate any idea you can help me with.

I recreated the bridge with another (still static) IP address. According to the nmcli response and journalctl report, everything was connected and activated properly - but alas, I still cannot ping any external IP.

What is the output of ip route? Maybe you got a bad route while setting up the kvm? And also you can try stopping firewalld if there is any chance of it interfering.
And if you can monitor the incoming traffic on the router, check if the packages reach it or not.

Hi hs303,
the ip route returns as follows


Disabling the firewall does not help. As of now I do not have a chance to monitor the traffic, but what I noticed is a confusing response to the netstat -i command

It seems like the second port (ens1f1np1) has some traffic, while the one I am going to use (ens1f0np0) - does not. I am curious whether somehow the network connector was misplaced into a wrong outlet… I will have to go to the office to double-check that.
Thank you!

I double-checked the physical connection. Everything is correct. However the netstat report still shows 0 received packets, despite the # of transmissions grows. If this is not a firewall, then what can it be?

Resolved! The network started working immediately after I simply switched from the Ethernet port 1 (ens1f0np0) to Ethernet port 2 (ens1f1np1). I am feeling lucky having dual-port Ethernet card now :slight_smile:

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.