IPv6 not configured on VR in Dual Stack shared network

[rajujith]

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

1. Create a shared network with IPv4 and IPv6
   2 .Deploy instances
   3 .Check the VMs for IPv6 IPs served by the VR
2. Check the VR for IPv6 configuration
   ...

What to do about it?

VR is to be fixed to implement IPv6.

[weizhouapache]

@rajujith
the VMs get SLAAC IPv6 address from upstream router
ACS VR do not provide SLAAC or DHCPv6 service

[rajujith]

@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.

[github-actions]

🏷️ 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

Generated by Issue Triage Agent

To install this workflow, run 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.

[weizhouapache]

@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

[rajujith]

@weizhouapache, please review the updates to the doc if it matches the current functionality. apache/cloudstack-documentation#628

[weizhouapache]

@weizhouapache, please review the updates to the doc if it matches the current functionality. apache/cloudstack-documentation#628

thanks @rajujith
I will review

[rajujith]

@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.

[rajujith]

Thanks @weizhouapache, based on our discussion offline, I have updated the doc PR.

[wido]

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.