Gateway4/Gateway 6 are Deprecated - How Do I Configure a /64 IPv6 Range
Linode
Linode Staff
I am configuring a /64 IPv6 range for my Ubuntu 22.04 Linode using this guide:
However, when using the sudo netplan apply command, I got this error:
** (generate:892): WARNING **: 09:17:45.901: `gateway4` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.
** (generate:892): WARNING **: 09:17:45.901: `gateway6` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.
What do I do now that gateway4 and gateway6 are deprecated?
1 Reply
bshoemaker
Linode Staff
First, you will want to make sure that net.ipv6.conf.eth0.autoconf is set to 1 as noted in this guide:
To resolve your gateway error, you will need to replace this section:
gateway4: 198.51.100.1 # Primary IPv4 gateway.
gateway6: "fe80::1" # Primary IPv6 gateway.
with this:
routes:
- to: default
via: 198.51.100.1
- to: default
via: "fe80::1"
To complete your /64 IP setup, you will also want to remove your original IPv6 address from your list of addresses and then add your /64 IPv6 addresses like so:
ethernets:
eth0:
dhcp4: no
dhcp6: no
addresses:
- 198.51.100.5/24 # Your Linode's public IPv4 address.
# 3 example static IPs from your /64 range:
- 2a01:5555:5555:5555::2/64
- 2a01:5555:5555:5555::3/64
- 2a01:5555:5555:5555::4/64
It's important to remember that you will still be able to interact with your SLAAC IPv6 address even though it is not listed in your netplan configuration.