Arch Linux

keineeile

Member

Registered: 2012-03-03

Posts: 44

[Solved] No global IPv6 assigned (Hetzner)

Hi all,

I am renting a small VPS (running Arch of course) from Hetzner which comes with both an IPv4 and IPv6 assigned to it. However, I am currently unable to make use of the IPv6 connection, no matter what I try, it seems like I'm not getting the global IPv6 assigned that my server is supposed to have. I use systemd-networkd to manage my network configuration. According to the support from Hetzner everything is working fine on their end, so does anybody see anything in my setup that is wrong?

# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 96:00:04:1c:af:0b brd ff:ff:ff:ff:ff:ff
    altname enx9600041caf0b
    inet xxx.xxx.x.xx/32 metric 1024 scope global dynamic enp1s0
       valid_lft 85967sec preferred_lft 85967sec
    inet6 fe80::9400:4ff:fe1c:af0b/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever
(... and a bunch of local stuff)

# cat /etc/systemd/networkd.conf
[Network]
#SpeedMeter=no
#SpeedMeterIntervalSec=10sec
#ManageForeignRoutingPolicyRules=yes
#ManageForeignRoutes=yes
#ManageForeignNextHops=yes
#RouteTable=
#IPv6PrivacyExtensions=no
#UseDomains=no

[IPv6AcceptRA]
#UseDomains=

[DHCPv4]
#DUIDType=vendor
#DUIDRawData=
#UseDomains=

[DHCPv6]
#DUIDType=vendor
#DUIDRawData=
#UseDomains=

[DHCPServer]
#PersistLeases=yes

# lsmod | grep ip6
ip6table_security      12288  0
ip6table_mangle        12288  0
ip6table_raw           12288  1
ip6table_nat           12288  1
nf_nat                 61440  4 ip6table_nat,xt_nat,iptable_nat,xt_MASQUERADE
ip6table_filter        12288  1
ip6_tables             36864  5 ip6table_filter,ip6table_raw,ip6table_nat,ip6table_mangle,ip6table_security
x_tables               65536  20 ip6table_filter,xt_conntrack,ip6table_raw,iptable_filter,iptable_security,ip6table_nat,xt_multiport,xt_tcpudp,xt_addrtype,xt_nat,xt_set,ip6_tables,ipt_REJECT,iptable_raw,ip_tables,iptable_nat,ip6table_mangle,ip6table_security,xt_MASQUERADE,iptable_mangle

# cat /proc/net/if_inet6 
00000000000000000000000000000001 01 80 10 80       lo
fe80000000000000940004fffe1caf0b 02 40 20 80   enp1s0
(... and more starting with fe80)

# ping -6 ipv6.google.com
ping: connect: Network is unreachable

# tracepath ipv6.google.com
 1:  send failed
     Resume: pmtu 128000 

I'm out of ideas of what to try, nothing seems to work. I would very much appreciate any pointers or hints! If any other info is necessary I'd be more than happy to provide it.

Thanks all,

keineeile

Last edited by keineeile (2025-05-20 09:51:32)

-thc

Member

Registered: 2017-03-15

Posts: 995

Re: [Solved] No global IPv6 assigned (Hetzner)

AFAIK if you configured your VPS to have a public IPv6 address - your VPS gets a whole /64 subnet assigned.

Then you have to assign one of the 2^64 addresses to your VPS by manually configuring it.
Since you didn't share the contents of "/etc/systemd/network" we can't say what's missing.

cryptearth

Member

Registered: 2024-02-03

Posts: 1,722

Re: [Solved] No global IPv6 assigned (Hetzner)

maybe my OVH config can help: https://bbs.archlinux.org/viewtopic.php … 8#p2226528
you should get your IPs either from your control panel or ask support
otherwise I recommend have Hetzner setup your server with one of the hier standard images - grab its config (should be similar to mibe) and reinstall Arch

mithrial

Member

Registered: 2017-03-05

Posts: 112

Re: [Solved] No global IPv6 assigned (Hetzner)

I'm not using Hetzner but I had to set the gateway for ipv6 connections to fe80::1

Where did you set your ipv4 address? There you should be able to set your ipv6 as well.

Last edited by mithrial (2025-05-20 09:43:10)

keineeile

Member

Registered: 2012-03-03

Posts: 44

Re: [Solved] No global IPv6 assigned (Hetzner)

Thanks to you all! I do indeed get a full /64 subnet and tried to configure it manually but didn't do it right. @cryptearth, you rock, your config helped me fix my config and now it works beautifully. This is a working config for Hetzner if anybody else comes across this:

# cat /etc/systemd/network/20-wired.network 
[Match]
Name=en*
Name=eth*

[Network]
DHCP=yes
UseDomains=true
Address=xxx.xxx.xxx.xxx
Address=your::ipv6:addr:here::1/64
Gateway=172.31.1.1
Gateway=fe80::1

Last edited by keineeile (2025-05-20 09:52:00)