8

I'm trying to achieve the equivalent of the ip command below via networkd without success.

ip route add default via fe80::1 dev eth0

My networkd configuration looks like below and brings up the network successfully apart from the default ipv6 routing. I've tried adding and removing GatewayOnLink=yes without any success. Running the command above after startup brings up ipv6 connectivity but I would prefer to do this via networkd configuration.

/etc/systemd/network/00-eth0.network
----

[Match]
Name=eth0

[Network]
DHCP=no
DNS=8.8.8.8

[Address]
Label=static-ipv4
Address=X.X.X.X/32
Peer=Y.Y.Y.Y

[Address]
Label=static-ipv6
Address=X:X:X:X::1/64

[Route]
Gateway=fe80::1
Gateway=Y.Y.Y.Y
GatewayOnlink=yes

This is for a Hetzner cloud server, I don't have any other IPV6 enabled machines to rule out something specific about their setup. Systemd is version 238 running on coreos.

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2
  • ok, not sure how relevant it is :) Other than the ipv6 routing all the configuration in the file is being applied. Commented Mar 29, 2019 at 15:26
  • Try removing the [Address] and [Route] headings and see if that works? Commented Apr 27, 2019 at 2:14

2 Answers 2

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5

You cannot have two Gateway directives in one [Route] block.

From reference: https://systemd.network/systemd.network.html#%5BRoute%5D%20Section%20Options

Specify several "[Route]" sections to configure several routes.

This is what works for me:

[Route]
Gateway=fe80::1
GatewayOnLink=yes

[Route]
Gateway=Y.Y.Y.Y
GatewayOnLink=yes

This way the first block adds a default IPv6 routing entry, equivalent to

ip -6 route add default via fe80::1 proto static

If you for whatever reason don't want the proto static part, add Proto=boot to the networkd configuration (it's the default for iproute2).

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0

Not the answer I'm hoping to accept since it involves configuration outside networkd, but it does bring my IPv6 routing up reliably:

~ $ cat /etc/systemd/system/ipv6-routing.service 
[Unit]
Description=Setup ipv6 routing
After=network-online.target
Requires=network-online.target

[Service]
Type=oneshot
ExecStart=/usr/bin/ip route add default via fe80::1 dev eth0
RemainAfterExit=true

[Install]
WantedBy=multi-user.target
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