With early networking and LUKS,
you dont want dracut overwriting your manual ifcfg config.

So follow these steps:
- Disable & mask rhel-import-state.service
- add NM_CONTROLLED=no to /etc/sysconfig/network-scripts/ifcfg-eth0
- Append %eth0 to the ipv6 gateway in the ifcfg script

Example ifcfg-eth0:
```
TYPE="Ethernet"
NM_CONTROLLED="no"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="dhcp"
DEFROUTE="yes"
DNS1=1.1.1.1
DNS2=9.9.9.9
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6ADDR=YOURIPADDRESS
IPV6_DEFAULTGW=fe80::1%eth0
DNS3=2606:4700:4700::1111
DNS4=2620:fe::fe
IPV6_FAILURE_FATAL="no"
NAME="eth0"
UUID="RANDOM"
DEVICE="eth0"
ONBOOT="yes"
```