Ubuntu 18.04 LTS tips

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Change network interface name to eth0
Disable IPv6

Change network interface name to eth0

find the current interface name

dmesg | grep -i eth

find out what is the bios name for interface, you will see that device was renamed during system boot change default grub to reflect bios device name instead

nano /etc/default/grub

comment out GRUB_CMDLINE_LINUX="" and add GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0" right after it
generate new grub config

grub-mkconfig -o /boot/grub/grub.cfg

reboot the machine

reboot

now check the interface name again

ifconfig -a | grep -i --color eth

Alle done ! reference
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Disable IPv6

paste the following in your terminal

cat << eot >> /etc/sysctl.conf

# disable ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
eot

verify

sudo sysctl -p

You will see this in the terminal whatever options are enabled/uncommented in sysctl.conf, in this example

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

second check

cat /proc/sys/net/ipv6/conf/all/disable_ipv6

if output is 1 then IPv6 is disabled Reference
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