So I uninstalled Netplan.io and used old setting (/etc/…/interfaces) and use post-up script with dhclient -r and dhclient. BUT, after upgrade Ubuntu 16.4LTS > Ubuntu 18.4LTS there isn’t problem, but when i Upgrade Ubuntu 16.4>18.4>20.4 there is problem with DHCP.
I thought, that problem was in Netplan, because on Ubuntu 16.4LTS wasn’t problem. Both server run on VMware esxi 6.5 and the network uses only IPv4 (IPv6 is disabled).ĭoes anyone know why this is happening and is there a solution to this? The server obtains the correct registered IP address (and use MAC address as xx-xx-xx-xx-xx-xx). Sudo dhclient -v -r ens160 & sudo dhclient -v ens160 Join the nixCraft community via RSS Feed, Email Newsletter or follow on Twitter.Hi, I have problem with Ubuntu Server 20.4 LTS.Īfter restarting Ubuntu Server 20.04.2 (clear installation), It obtains the wrong IP address from DHCP server (Windows Server 2012 R2). He wrote more than 7k+ posts and helped numerous readers to master IT topics. Vivek Gite is the founder of nixCraft, the oldest running blog about Linux and open source. Inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3 Inet 74.xx.yy.zzz netmask 0xfffffff0 broadcast 74.xx.yyy.zzz OR as a root user type following command: # grep eth0 /var/log/dmesgĮth0: RealTek RTL8139 at 0xc000, 00:0f:ea:91:04:07, IRQ 18Įth0: Identified 8139 chip type 'RTL-8100B/8139D'Įth0: link up, 100Mbps, full-duplex, lpa 0x45E1 FreeBSD example TX packets:3869 errors:0 dropped:0 overruns:0 carrier:0 RX packets:3869 errors:0 dropped:0 overruns:0 frame:0 Although the configuration initially seems a lot easier and more user-friendly, when you add IPv6 and routing in the mix, it soon goes terribly wrong. RX bytes:69273219 (66.0 MiB) TX bytes:14285799 (13.6 MiB) Ubuntu 18.04 as a router with IPv6 With the release of Ubuntu 18.04, it was decided to replace the traditional network configuration with the YAML-based netplan. TX packets:109216 errors:0 dropped:0 overruns:0 carrier:0 RX packets:60400 errors:0 dropped:0 overruns:0 frame:0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 In order to find out MAC address of system you can use ifconfig command as follows: Ifconfig is used to configure the kernel-resident network interfaces. (see mac address at wikipedia for more information).įollowing command work with Linux and other UNIX oses: ifconfig command Most layer 2 network protocols use one of three numbering spaces managed by the IEEE: MAC-48, EUI-48, and EUI-64, which are designed to be globally unique. A mac address is acronym for media access control address, is a unique address assigned to almost all-networking hardware such as Ethernet cards, router etc.
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