Tag: RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1

Ubuntu 18.04 detects wired connection and has access to LAN connections, but can’t reach the internet

Post author By Ubuntu Questions
Post date April 8, 2020
No Comments on Ubuntu 18.04 detects wired connection and has access to LAN connections, but can’t reach the internet

First off, I’m very new with Ubuntu, this is a work computer I’m trying to setup. Any help will be greatly appreciated! It’s a prebuilt that doesn’t have a wifi card, but two ethernet ports (dual xeon machine for scientific computing purposes). When I plug my ethernet cable in, which works for other windows machines, […]

Tags BROADCAST, but I can't have any access whatsoever to the internet, but it hasn't worked this time... Any help would be greatly appreciated! Have a good day! :), but two ethernet ports (dual xeon machine for scientific computing purposes). When I plug my ethernet cable in, etc., First off, here's the output when I run ifconfig : eth0: flags=4163<UP, I'll get a message that the host was unavailable. Edit : If it can help, I'm very new with Ubuntu, if I try and ping any local IP adress, it works flawlessly, LOOPBACK, manually setting up the connectiong, MULTICAST> mtu 1500 ether 44:39:c4:92:94:f6 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, MULTICAST> mtu 1500 inet 169.254.11.150 netmask 255.255.0.0 broadcast 169.254.255.255 ether 44:39:c4:92:94:f6 txqueuelen, MULTICAST> mtu 1500 inet 192.168.1.20 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::4639:c4ff:fe92:94f7 prefi, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1, the 1000MB/s connection is detected in the settings, this is a work computer I'm trying to setup. Any help will be greatly appreciated! It's a prebuilt that doesn't have a wifi card, to no avail. In general when it wouldn't work I'd run sudo ifdown -a and then sudo ifup -a, whatever IP I try, which works for other windows machines

User Help

CentOS not finding wifi adapter

Post author By How To
Post date April 7, 2020
No Comments on CentOS not finding wifi adapter

I installed CentOS on a Lenovo yoga laptop a few days ago, but I cannot get the wifi to work. I’ve tried lots of things following suggestions from replies to several questions on different sites. NetworkManager-wifi is installed (and always was). Below are some of the commands people usually ask for, I really don’t know […]

Tags :1.257/org.gnome.S> abr 06 19:21:20 localhost.localdomain NetworkManager[1835]: [1586215280.5142] dhcp6 (enp0s13f0u1u1u1): request ti, BROADCAST, but I cannot get the wifi to work. I've tried lots of things following suggestions from replies to several questions on different sites. Netw, count: 1841073149 [ 5.660579] iwlwifi 0000:00:14.3: Loaded firmware version: 48.4fa0041f.0 [ 5.660622] iwlwifi 0000:00:14.3: 0xFFBAECB7, count: 7 [ 5.662036] iwlwifi 0000:00:14.3: 0x201013F1 | ADVANCED_SYSASSERT [ 5.662079] iwlwifi 0000:00:14.3: 0x00000000 | umac branchli, CPU2 Status: 0x3 [ 5.682118] iwlwifi 0000:00:14.3: Failed to start RT ucode: -5 [ 5.683327] iwlwifi 0000:00:14.3: Collecting data: trig, device a> abr 06 19:20:33 localhost.localdomain NetworkManager[1835]: [1586215233.0907] device (virbr0-nic): state change: activated, I installed CentOS on a Lenovo yoga laptop a few days ago, I really don't know what else to do; any help would be greatly appreciated! I'm using CentOS 8, kernel 4.18.0-147.5.1.el8_1.x86_64 (updated after install). $ ifconfig enp0s13f0u1u1u1: flags=4163<UP, LOOPBACK, MULTICAST> mtu 1500 inet 192.168.1.103 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::210c:8034:2c3b:6a3 prefi, MULTICAST> mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:76:1a:63 txqueuelen, REV=0x338 [ 5.633269] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM [ 5.635529] iwlwifi 0000:00:14.3: Allocated 0x0040, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1

Mastering Development System & Network

Random “Connection resets by peer” with redis-benchmark

Post author By Server Questions
Post date April 6, 2020
No Comments on Random “Connection resets by peer” with redis-benchmark

I’ve got several linux hosts in office network. When I run Redis server on one of them, redis clients receive random errors “Connection reset by peer”. We’ve noticed these errors with our own clients using hiredis. However, the same error is reproduced with the utility redis-benchmark included in the Redis package. This utility simulates several […]

Tags BROADCAST, enp7s0 ] dhcp-identifier: mac I am ready to provide other information that could help to debug the problem. The issue is complicated, I ssh to HostB, I've found that connection resets appear even if it simulates only one client (redis-benchmark -h hostA -c 1). There are no errors, I've got several linux hosts in office network. When I run Redis server on one of them, if it simulates one request from one client (redis-benchmark -h hostA -n 1 -c 1) UPD. There are errors. They appear if I repeat very quickly, joined together in bond. Other PCs, LOOPBACK, master, MULTICAST> mtu 1500 ether 3e:d3:d3:99:68:d3 txqueuelen 1000 (Ethernet) RX packets 1288878613 bytes 1821877190815 (1.8 TB), MULTICAST> mtu 1500 ether 3e:d3:d3:99:68:d3 txqueuelen 1000 (Ethernet) RX packets 1289031424 bytes 1821053170461 (1.8 TB), MULTICAST> mtu 1500 inet 106.109.130.19 netmask 255.255.252.0 broadcast 106.109.131.255 inet6 fe80::3cd3:d3ff:fe99:68d3 p, ones that do not reset connections, redis clients receive random errors "Connection reset by peer". We've noticed these errors with our own clients using hiredis. However, run Ubuntu 16.04 and 18.04. Here is the Netplan configuration of that PC: network: version: 2 renderer: networkd ethernets: enp6s, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1, sending requests to the Redis server in parallel. The redis-benchmark utility often stops with this error, slave, the same error is reproduced with the utility redis-benchmark included in the Redis package. This utility simulates several clients, then run redis-benchmark -h hostA). Errors occur in approximately 50-60% of cases. By debugging this problem, there are no errors, they don't reset connection. This suggests that the problem is in the TCP stack of that hostA. How can I debug it? Problematic PC runs Ubu, when redis-benchmark is run from the same host that runs Redis. If I launch redis server with identical config on other hosts in the same ne, when run from other host (that is

Linux Mastering Development Ubuntu

Wifi issues with Ubuntu 18.04

Post author By Ubuntu Questions
Post date April 5, 2020
No Comments on Wifi issues with Ubuntu 18.04

I’m running Ubuntu 18.04 on a Lenovo laptop, and I’m having lots of issues with my wifi. Originally, I installed Wicd, that made the connection better, but caused issues by making my wpa_supplicant fail. Now I’m back on network manager, and when I boot up, I instantaneously get good internet speeds, but then it’s almost […]

Tags and I'm having lots of issues with my wifi. Originally, and when I boot up, BROADCAST, but caused issues by making my wpa_supplicant fail. Now I'm back on network manager, but it's really getting me down as I've been struggling for a while., but then it's almost like my wifi "locks up" and my speeds drop to below 1mbps. Here is my info: # hwinfo --wlan --short network:, I installed Wicd, I instantaneously get good internet speeds, I'm running Ubuntu 18.04 on a Lenovo laptop, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] 03:00.0 Ethernet controller: Realtek Semiconductor Co., LOOPBACK, Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06) 04:00.0 System peripheral: Ricoh Co Ltd MMC/SD Host Controller (rev 0, MULTICAST> mtu 1500 ether f0:de:f1:6b:92:b7 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, MULTICAST> mtu 1500 inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255 ether 02:42:72:7e:6d:f9 txqueuelen 0 (E, MULTICAST> mtu 1500 inet 192.168.8.5 netmask 255.255.255.0 broadcast 192.168.8.255 inet6 fe80::bd97:1f4b:4f54:caa1 prefix, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1, that made the connection better

Linux Mastering Development

Route eth0 to tun0 (OpenVPN) and leave wlan0 unaffected

Post author By Linux Questions
Post date April 5, 2020
No Comments on Route eth0 to tun0 (OpenVPN) and leave wlan0 unaffected

I currently have a Raspberry Pi Model B+ v1.2 (and I am planning to get the Raspberry Pi 4 after I sort out these issues). I have the network interface eth0 connected to my router through an Ethernet cable, and I have wlan0 connected to the same router through Wi-Fi. I am planning on using […]

Tags and I have wlan0 connected to the same router through Wi-Fi. I am planning on using this Raspberry Pi as a seedbox where I want all the traf, and then I want to leave the wlan0 interface unaffected by the VPN so I am able to access the qBittorrent-nox WebUI from my public no-ip addr, BROADCAST, I currently have a Raspberry Pi Model B+ v1.2 (and I am planning to get the Raspberry Pi 4 after I sort out these issues). I have the network, LOOPBACK, MULTICAST> mtu 1500 inet 10.28.10.6 netmask 255.255.255.255 destination 10.28.10.5 inet6 fe80::c6ba:27ae:2226:dfa2 prefix, MULTICAST> mtu 1500 inet 192.168.1.26 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::f96:bfff:cd6d:d1d6 prefix, MULTICAST> mtu 1500 inet 192.168.1.27 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 fe80::65b8:5d35:c9e6:b85f prefi, NOARP, POINTOPOINT, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1

Linux Mastering Development Ubuntu

System Freeze UFW OPENVPN Network Timeouts

Post author By Ubuntu Questions
Post date April 4, 2020
No Comments on System Freeze UFW OPENVPN Network Timeouts

Problem My computer randomly freezes (does not accept any input anymore, mouse pointer is frozen) or shuts down (not completely, it “hangs” so that even pushing the reset button won’t restart, I then have to press the power button for a few seconds to turn it off completely). System Hardware I’m using a wifi USB […]

Tags BIOS 1.00 03/09/2017 Mar 12 12:15:53 COMPUTER kernel: [ 7403.683047] RIP: 0010:native_queued_spin_lock_slowpath+0x65/0x1c0 Mar 12 12:15:53 CO, BROADCAST, but it seems to have no effect. ifconfig output: enp30s0: flags=4099<UP, forgive me if this is missing vital information. I'm using UFW firewall and connect to VPN servers through openvpn, I don't know what exactly is revelant. wlxb039564f2855 is the name of my wifi USB stick. I have retracted some non-local IPs and MAC addresse, I then have to press the power button for a few seconds to turn it off completely). System Hardware I'm using a wifi USB stick to connect, it "hangs" so that even pushing the reset button won't restart, local='link-mtu 1602', local='tun-mtu 1500', LOOPBACK, LZO 2.08 sudo NetworkManager --version output: 1.10.6 ndiswrapper -v output: utils version: '1.9', mitigating potential DNS violation DVE-2018-0001, mouse pointer is frozen) or shuts down (not completely, MULTICAST> mtu 1500 ether 4c:cc:6a:f9:56:9b txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, MULTICAST> mtu 1500 inet 10.0.0.62 netmask 255.255.255.0 broadcast 10.0.0.255 inet6 fe80::21d6:bdc9:e12f:845 prefixlen 64, MULTICAST> mtu 1500 inet 10.7.3.4 netmask 255.255.255.0 destination 10.7.3.4 inet6 fe80::f9ed:3025:72ea:6375 prefixlen 64, NOARP, POINTOPOINT, Problem My computer randomly freezes (does not accept any input anymore, remote='link-mtu 1634' Feb 13 15:43:15 COMPUTER nm-openvpn[5169]: WARNING: 'tun-mtu' is used inconsistently, remote='tun-mtu 1532' Feb 13 15:43:17 COMPUTER systemd-resolved[827]: Server returned error NXDOMAIN, retrying transaction with reduced feature level UDP. Feb 13 15:43:21 COMPUTER kernel: [25581.970924] [UFW BLOCK] IN= OUT=wlxb039564f2855 SRC=, retrying transaction with reduced feature level UDP. Feb 13 15:43:34 COMPUTER wpa_supplicant[1221]: wlxb039564f2855: WPA: Group rekeying comp, retrying transaction with reduced feature level UDP. Feb 23 17:38:04 COMPUTER kernel: [25834.860873] [UFW BLOCK] IN= OUT=wlxb039564f2855 SRC=, retrying transaction with reduced feature level UDP. Feb 23 17:38:10 COMPUTER NetworkManager[1271]: [1582475890.4437] connectivity: (, retrying transaction with reduced feature level UDP. Mar 14 23:26:35 COMPUTER kernel: [10258.192232] [UFW BLOCK] IN= OUT=wlxb039564f2855 SRC=, retrying transaction with reduced feature level UDP. Mar 27 18:18:29 COMPUTER kernel: [26886.732964] [UFW BLOCK] IN= OUT=wlxb039564f2855 SRC=, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1, tun0) and to specific IPs of my VPN service provider. It seems to work that if the VPN connection stops working no other traffic is possible., using the NetworkManager package. I checked the syslogs for a recurring pattern before the system crashes. Packages uname output: Linux COM, utils version needed by module: '1.9' sudo ufw status output: Status: active To Action From --, which in turn connects to a wifi router that is connected to the internet. My wifi stick is old and there are no official Linux drivers so I'

Linux Mastering Development Ubuntu

PLEASE HELP: wlan0 no longer available after docker install

Post author By Ubuntu Questions
Post date March 23, 2020
No Comments on PLEASE HELP: wlan0 no longer available after docker install

After using the following commands to install docker: [user@localhost ~]$ curl -fsSL https://get.docker.com -o get-docker.sh [user@localhost ~]$ sudo sh get-docker.sh [user@localhost ~]$ sudo usermod -aG docker $USER and rebooting, my wlan0 device is no longer available (and was replaced by docker0). I disabled the docker service systemctl disable docker) and rebooted again. I now have […]

Tags After using the following commands to install docker: [user@localhost ~]$ curl -fsSL https://get.docker.com -o get-docker.sh [user@localhost, BROADCAST, count: 6 [ 38.631036] iwlwifi 0000:04:00.0: Loaded firmware version: 29.1654887522.0 [ 38.631037] iwlwifi 0000:04:00.0: 0x00000084 | NMI_, empty sections [ 38.629872] iwlwifi 0000:04:00.0: Failed to read NVM: -61 [ 38.629873] iwlwifi 0000:04:00.0: Collecting data: trigger 16, fast devsel, IRQ 69, iwlwifi, latency 0, LOOPBACK, mac80211 Any ideas why my wireless interface would've disappeared because of docker? Thanks in advance, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Device Serial Number a0-af-bd-ff-ff-c3-3f-52 Capabilities, MULTICAST> mtu 1500 ether 00:e0:4c:68:0d:9c txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, MULTICAST> mtu 1500 ether 70:85:c2:52:23:dd txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, MULTICAST> mtu 1500 ether 70:85:c2:52:23:df txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, my wlan0 device is no longer available (and was replaced by docker0). I disabled the docker service systemctl disable docker) and rebooted ag, non-prefetchable) [size=8K] Capabilities: [c8] Power Management version 3 Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+, NUMA node 0 Memory at 92d00000 (64-bit, REV=0x220 [ 38.629869] iwlwifi 0000:04:00.0: Can't parse phy_sku in B0, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1

Mastering Development System & Network

OpenVPN connected client cannot connect to VPN servers network (bridge mode)

Post author By Server Questions
Post date March 23, 2020
No Comments on OpenVPN connected client cannot connect to VPN servers network (bridge mode)

I have installed an OpenVPN server on Ubuntu server (192.168.178.30). The connection works well, OpenVPN is in bridged mode – I got IP address 192.168.178.220 as connected client. But when I try to ping the VPN server itself or other devices in 192.168.178.0/24 (suche as the FritzBox at 192.168.178.1) nothing works. Also I do not […]

Tags 1.1.1.1] ifconfig br0: flags=4163<UP, BROADCAST, ESTABLISHED -j ACCEPT -A FORWARD -s 10.8.0.0/24 -j ACCEPT <- Why should I need this? -A FORWARD -i br0 -j ACCEPT sudo cat /etc/netplan/* #, I have installed an OpenVPN server on Ubuntu server (192.168.178.30). The connection works well, ifconfig looks good -> see below) – and I am pretty sure it worked a few hours ago (I am configuring the server at this time – but do not kno, LOOPBACK, MULTICAST> mtu 1500 ether 00:15:5d:b2:04:00 txqueuelen 1000 (Ethernet) RX packets 6098 bytes 600451 (600.4 KB) RX, MULTICAST> mtu 1500 inet 192.168.178.30 netmask 255.255.255.0 broadcast 192.168.178.255 inet6 fe80::215:5dff:feb2:400 pre, MULTICAST> mtu 1500 inet6 fe80::24a3:8bff:fed5:65cb prefixlen 64 scopeid 0x20 ether 26:a3:8b:d5:65:cb txqueuelen 10, netplan config looks good, OpenVPN is in bridged mode – I got IP address 192.168.178.220 as connected client. But when I try to ping the VPN server itself or other dev, PROMISC, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1, see netplan(5). network: version: 2 renderer: networkd ethernets: eth0: dhcp4: no bridges: br0: interfaces: [eth0

Mastering Development System & Network

Ubuntu after bridging network no internet

Post author By Server Questions
Post date March 22, 2020
No Comments on Ubuntu after bridging network no internet

I am running an Ubuntu server with OpenVPN and apache on it (192.168.178.30). The FritzBox (Router) is 192.168.178.1. OpenVPN is is bridge mode. When I start the bridge using the OpenVPN shell script (bee below) ifconfig looks like this and I have no internet connection anymore: br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.178.30 netmask 255.255.255.0 broadcast […]

Tags # for example tap="tap0 tap1 tap2". tap="tap0" # Define physical ethernet interface to be bridged # with TAP interface(s) above. eth="eth0", 1.1.1.1] Should here br0 be defined (instead of eth0)? Tried that and seems that was the answer. Will observe that., BROADCAST, I am running an Ubuntu server with OpenVPN and apache on it (192.168.178.30). The FritzBox (Router) is 192.168.178.1. OpenVPN is is bridge mo, LOOPBACK, MULTICAST> mtu 1500 ether 6a:e5:9c:c5:4e:5f txqueuelen 100 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 d, MULTICAST> mtu 1500 inet 192.168.178.30 netmask 255.255.255.0 broadcast 192.168.178.255 inet6 fe80::215:5dff:feb2:400 pre, MULTICAST> mtu 1500 inet6 fe80::215:5dff:feb2:400 prefixlen 64 scopeid 0x20 ether 00:15:5d:b2:04:00 txqueuelen 1000, PROMISC, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1

Mastering Development System & Network

ifconfig not showing wlan0

Post author By Server Questions
Post date March 22, 2020
No Comments on ifconfig not showing wlan0

Not able to see wlan0 on executing the command ifconfig: The output on executing the command ifconfig is eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255 inet6 fe80::a00:27ff:fe1f:3076 prefixlen 64 scopeid 0x20<link> ether 08:00:27:1f:30:76 txqueuelen 1000 (Ethernet) RX packets 6 bytes 1430 (1.3 KiB) RX errors 0 dropped 0 overruns 0 frame 0 […]

Tags BROADCAST, LOOPBACK, MULTICAST> mtu 1500 ether 52:67:c6:4c:0a:58 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0, MULTICAST> mtu 1500 inet 10.0.2.15 netmask 255.255.255.0 broadcast 10.0.2.255 inet6 fe80::a00:27ff:fe1f:3076 prefixlen 64, Not able to see wlan0 on executing the command ifconfig: The output on executing the command ifconfig is eth0: flags=4163<UP, RUNNING, RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1