Configuring IPv6 on OpenBSD

Introduction

Vultr supports IPv6 for all VPS and Bare Metal instances. To enable IPv6, use either of these methods:

• Select Enable IPv6 in the Additional Features section when deploying a new instance.
• Use this guide to add IPv6 support, or add a secondary address, to a deployed instance.

Add IPv6 to an Instance

Requirements

• Please ensure that slaacd is enabled and running.

• IPv6 autoconfiguration depends on ICMP protocol. Please verify you haven't blocked ICMP routeradv, neighbrsol, neighbradv packet types. For example, this ruleset for pf.conf passes the required traffic:

  pass in on egress inet6 proto icmp6 all icmp6-type { echoreq routeradv neighbrsol neighbradv }
  

Procedure

To add an IPv6 network to a running instance:

1. Navigate to the Settings tab for the instance.
2. Select the IPv6 menu.

3. Click the Assign IPv6 Network button.

   

4. Restart the server via the Vultr Customer Portal. Important: rebooting via SSH doesn't activate the new network.

5. Add the following line to /etc/hostname.vio0.

   • If using OpenBSD 6.0 through 6.2:

     inet6 autoconf -autoconfprivacy
     

   • If using OpenBSD 6.3 through 6.8:

     inet6 autoconf -autoconfprivacy -soii
     

   • If using OpenBSD 6.9:

     inet6 autoconf -soii -temporary
     

6. Restart the interface or reboot.

   # sh /etc/netstart vio0
   

7. Verify the interface status with slaacctl.

   # slaacctl show interface
   

Add Secondary IPv6 to an Instance

Optionally, you may configure a secondary IPv6 address for your instance.

1. Add the following line to /etc/hostname.vio0. Replace the example with an address in your IPv6 subnet.

   inet6 alias 2001:db8:1000::200 64
   

2. Restart the interface or reboot.

   # sh /etc/netstart vio0
   

3. Verify the interface status with slaacctl.

   # slaacctl show interface
   

More Information

Refer to specific network configuration examples on the instance's IPv6 information page.