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Linux Mastering Development

enp3s0 link DOWN after playing Quake Champions

Playing Quake Champions on steamplay. A few minutes into the game, my PC gets disconnected from my router. Things get back to normal a few minutes after, but sometimes I have to restart the PC. ip addr‘s output after I get the problem: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen […]

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Linux Mastering Development Ubuntu

enp3s0 link DOWN after playing Quake Champions

Playing Quake Champions on steamplay. A few minutes into the game, my pc gets disconnected from my router. Things get back to normal a few minutes after, but sometimes I have to restart my pc. ip addr’s output after I get the problem: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen […]

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Linux Mastering Development Ubuntu

Network Problems after creating network bridge

i wanted to install some virtual machines on my server using KVM so for this purpose i created a network bridge. so far so good… My OS is Ubuntu 20.04. I change the 01-netcfg.yaml file in /etc/netplan: before: network: version: 2 renderer: networkd ethernets: enp5s0: dhcp4: no addresses: [192.168.192.222/24] gateway4: 192.168.192.1 nameservers: addresses: [8.8.8.8] search: […]

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Linux Mastering Development

Guest VM not able to access internet and routerGW via br0 in Centos7 KVM environment

I have setup KVM environment over VirtualBox (nested Vt). The guest VM Ubuntu can ping VM host Centos7 and vise-versa but not able to access internet and not able to ping my InternetLANrouter gw (192.168.0.1). I have create bridge br0 and mapping with interface enp0s3. VMHostCentos7 able to ping my LAN, routerGW and able to […]

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Linux Mastering Development

Guest VM not able to access internet and routerGW via br0 in Centos7 KVM environment

I have setup KVM environment over VirtualBox (nested Vt). The guest VM Ubuntu can ping VM host Centos7 and vise-versa but not able to access internet and not able to ping my InternetLANrouter gw (192.168.0.1). I have create bridge br0 and mapping with interface enp0s3. VMHostCentos7 able to ping my LAN, routerGW and able to […]

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Mastering Development System & Network

Unable to configure IPv6 correctly in Ubuntu 18.04

I have a cloud instance on OVH which is accessible over IPv4 but not IPv6. It’s running Ubuntu 18.04. I’ve found conflicting advice about using netplan vs configuring systemd-networkd directly, but all of the things I’ve tried don’t seem to have any effect. In OVH’s web interface I have these addresses defined for me: IPv6: […]

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Linux Mastering Development

Troubleshooting SSH issues over secondary IP address

** added IP info I have an Ubuntu 18.04 server with the following physical configuration: 1 eth for management 4 eth bonded for serving media locally Initial setup was done via SSH over the Ethernet management link. I configured it with a static IP address and things ran smoothly. I then configured the bond with […]

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Linux Mastering Development

Guest VM not able to access internet and routerGW via br0 in Centos7 KVM environment

I have setup KVM environment over VirtualBox (nested Vt). The guest VM Ubuntu can ping VM host Centos7 and vise-versa but not able to access internet and not able to ping my InternetLANrouter gw (192.168.0.1). I have create bridge br0 and mapping with interface enp0s3. VMHostCentos7 able to ping my LAN, routerGW and able to […]

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Linux Mastering Development

Why eth0 and eth1 is up after 10 minutes login screen appears

Question is Why I need to wait for the link is up for eno3 for 5 minutes and eno4 for 10 minutes after login screen appear. is it something I can do about it ? If I try manually up any of eth it gives me error message link is not ready. prior to centos […]

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Linux Mastering Development

When does Linux use publicly routable IPv4 address configured on a loopback interface?

Let’s say, that I have a following routing table: ffgrt@srv28:~$ ip -4 a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet 14.2.13.24/32 scope global lo valid_lft forever preferred_lft forever 2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default […]