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IPv6 not configured on VR in Dual Stack shared network #12696
Description
Activity
@rajujith
the VMs get SLAAC IPv6 address from upstream router
ACS VR do not provide SLAAC or DHCPv6 service@rajujith the VMs get SLAAC IPv6 address from upstream router ACS VR do not provide SLAAC or DHCPv6 service
thanks @weizhouapache, I read the https://docs.cloudstack.apache.org/en/4.22.0.0/plugins/ipv6.html#shared-network but it wasn't clear.
🏷️ Issue Triaged
Hi
@rajujith! I've categorized this issue as bug based on the following analysis:Reasoning: IPv6 configuration is not working as expected on Virtual Router in dual stack shared networks. The issue describes a failure in the IPv6 DHCP configuration on dnsmasq, which is a functional defect in the networking functionality.
View Triage Details
Analysis
- Keywords detected: "not configured", "problem", "dual stack", "DHCP"
- Issue type indicators: Reports a specific failure in IPv6/DHCP functionality on VR; describes unexpected system behavior
- Confidence: High
Recommended Next Steps
- Verify the VR configuration and dnsmasq settings
- Check if this affects all dual stack shared networks or specific configurations
- Review recent changes to VR networking code
References: Triage run §22310263658
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gh aw add github/gh-aw/.github/workflows/issue-triage-agent.md@94662b1dee8ce96c876ba9f33b3ab8be32de82a4. View source at https://github.com/github/gh-aw/tree/94662b1dee8ce96c876ba9f33b3ab8be32de82a4/.github/workflows/issue-triage-agent.md.@rajujith the VMs get SLAAC IPv6 address from upstream router ACS VR do not provide SLAAC or DHCPv6 service
thanks @weizhouapache, I read the https://docs.cloudstack.apache.org/en/4.22.0.0/plugins/ipv6.html#shared-network but it wasn't clear.
I think there are some mistakes on the page, but I am not 100% sure.
@wido could you please have a look at the page ? thanks
@weizhouapache, please review the updates to the doc if it matches the current functionality. apache/cloudstack-documentation#628
@weizhouapache, please review the updates to the doc if it matches the current functionality. apache/cloudstack-documentation#628
thanks @rajujith
I will review@weizhouapache @wido the IPv6 ip address allocated by CloudStack for the NIC will be different from the SLAAC address it generates right? In this case, how does it work with Security Group etc.
Thanks @weizhouapache, based on our discussion offline, I have updated the doc PR.
I also mentioned this in the docs update: As far as I know we only support SLAAC (based on MAC) for IPv6, no DHCPv6 for address allocation to VMs.
Reacted by Jithin Raju and Wei Zhou- moved this from In Review to Done in Apache CloudStack BugFest - Issues
on Sep 1, 2026
problem
IPv6 is not configured on a dual stack shared network. IPv6 is configured on the VR guest interface; it's not configured on dnsmasq to serve DHCP.
versions
4.22.0.0
The steps to reproduce the bug
2 .Deploy instances
3 .Check the VMs for IPv6 IPs served by the VR
...
What to do about it?
VR is to be fixed to implement IPv6.