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1. Mac address ubuntu 18.04 how to#
2. Mac address ubuntu 18.04 update#
3. Mac address ubuntu 18.04 password#
4. Mac address ubuntu 18.04 mac#

THIS IS WHERE THE NETWORK CONFIG CAN GO WRONG.

Mac address ubuntu 18.04 mac#

Name: ens3 # <- remove MAC address key and value and replace with name: interface

Mac address ubuntu 18.04 update#

Next, either copy and paste the following or update it in the file.

Open the following file on your VM using your editor of choice: /etc/netplan/50-cloud-init.yaml. Log into your instance via SSH or the console if you aren't already logged in. Close the console and SSH into the VM if you haven't already. If you are accessing the VM via the console, then this should have resumed SSH connectivity which will make things easier for you as you can now use normal terminal functionality such as copy and paste. Using the address from our example, this should look something like this: sudo route del -net 0.0.0.0 gw 10.0.0.2 netmask 0.0.0.0 dev ens3 Remove the incorrect gateway, replacing with the address from the previous step: sudo route del -net 0.0.0.0 gw netmask 0.0.0.0 dev ens3 Step 6 - Remove the incorrect gateway and restore SSH access Yours will likely be different but will be an address from the 10.0.0.0/8 range. The part you are interested in is inet 10.0.0.2, which is the address you need for the next step. TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Which will output something similar to: default via 172.31.255.254 dev ens4 proto dhcp metric 100ĭefault via 10.0.0.1 dev ens3 proto dhcp metric 100 # mtu 1450 When bringing up the private interface from the 10.X.X.X range, it assigns a second default gateway from DHCP which we don't want. On the 18.04 Netplan images however, because instances have two virtual NICs, the default configuration created by Netplan and systemd-networkd creates two default gateways. What happens on other Civo cloud images is that a single default gateway is set to be the interface on the 172.31.0.0/16 network which is used specifically for NAT via 172.31.255.254 (see here for more detail). If you would prefer us to apply the fixes to your instance, we are more than happy to, but we will need access to your VMs temporarily in order to do so.

If you have rebooted your instance and are no longer able to connect, please get in contact with us and we will recover the instance and / or the networking to allow you to gain access to your machine(s) and apply the fixes detailed below.

Mac address ubuntu 18.04 password#

If you have setup your instances with an SSH key instead of a password, you will need to temporarily create a username and password so that you can access the VM via the console should the network be configured incorrectly.

Mac address ubuntu 18.04 how to#

Update: there is a newer guide on how to resolve this issue by removing Netplan altogether: Remove Netplan from Ubuntu Bionic Beaver (18.04) If you have not already rebooted, we strongly urge you to follow this guide carefully before doing so. The medium term solution is to remove Netplan for new 18.04 images. This will unfortunately disable true private networking on the instance altogether. The only workaround we have so far for existing VMs that have already been launched is to disable DHCP for the private only network interface. The bug will cause either intermittent SSH access to VMs after reboot or will completely prevent all network access post reboot. This bug is caused by the new networking configuration abstraction renderer called Netplan that is used by default in Bionic. Check if Macchanger is actually working on your systemīefore creating a systemd unit to automatically change the MAC address on every reboot, check if Macchanger can actually change your MAC address (I have seen cases where it does not work for some reason).We recently discovered a bug on instances launched with the Ubuntu 18.04 image. Make a note of the network interface 3 whose MAC address is to be spoofed. for the wired interface, and wlan0, 1st class wireless). Here, the wired network interface is enp10s0 The wireless network interface is wlp3s0 (Previously, eth0, 1 etc. Link/ether 1d:21:da:ab:1d:71 brd ff:ff:ff:ff:ff:ffģ: wlp3s0: mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0Įther 1e:14:57:1c:66:11 txqueuelen 1000 (Ethernet)ġ: lo: mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 Your network interface should now display as follows: