ipv6 ssh not working with RHEL from internet

RAKESH B R 0

I am having a RHEL 8.8 instance with dual stack , For which I have added two public ips ipv4/ipv6 .

I am able to ssh through public ipv4 , but I am not able to ssh using Public IPv6 .

https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/ipv6-overview depects that IPv6 needs load balancer for internet Access , while Creating public ip , also it shows that load balancer is only supported for public ip with nic . but with custom template I am able to create a Vm using both public Ips (v4/v6) .

https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-ipv6-for-linux?toc=%2Fazure%2Fvirtual-network%2Fip-services%2Ftoc.json&tabs=redhat i have made these changes as well , didn't fix my issue .

Does Azure support IPV6 public ip ssh through Internet , without load balancer ?

KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-12T03:10:31.1066667+00:00

@RAKESH B R

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

I shall check this behavior and report back here.

However, you can always create a VM with both Public IPV4 and IPV6 attached to the NIC (even from Portal).

Cheers,

Kapil
KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-13T10:27:25.32+00:00
@RAKESH B R

I was able to do a Lab with an Ubuntu VM and I was successfully able to SSH using IPV6 without a Load Balancer.

So, this is doable.

Please make sure that you are allowing your source IPV6 address to the NSGs (both NIC and Subnet)

Make sure the configuration of : https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-ipv6-for-linux?toc=%2Fazure%2Fvirtual-network%2Fip-services%2Ftoc.json&tabs=redhat is correct.

Refer :

https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/create-vm-dual-stack-ipv6-portal

https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-ipv6-for-linux?tabs=redhat

Let us know if this helps.

Cheers,

Kapil
KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-14T08:39:58.5833333+00:00

@RAKESH B R

May I know if you got a chance to review my previous comment?

Please let me know if you are facing any challenges or if there are any follow-up questions, I shall be glad to address them.

Thanks,

Kapil
RAKESH B R 0 Reputation points

2023-09-14T08:43:00.9133333+00:00

hi @KapilAnanth-MSFT ,

Can you please share me the arm template you used to attach both ipv4 public ip and ipv6 public ips to NIc interface , I am facing issue with that
KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-14T08:55:00.21+00:00
@RAKESH B R

I did it with Portal.

The requirement is that you must create two IcPonfigs,

One will be the primary default one (Ipv4)

The second one must be created as Ipv6 and you must attach the Ipv6 Public IP to this.

Please refer to the : Network interface configuration section

Should you require Ipv6 ARM templates, you can refer to : https://learn.microsoft.com/en-us/azure/load-balancer/ipv6-configure-standard-load-balancer-template-json

Let me know if you need more information on this.

Cheers,

Kapil
RAKESH B R 0 Reputation points

2023-09-15T04:08:54.8666667+00:00

I tried with RHEL 8.8 I still find , not accessible with ipv6 ,

I did find similar issue where they have provided load balancer as the method to use - https://learn.microsoft.com/en-us/azure/load-balancer/virtual-network-ipv4-ipv6-dual-stack-standard-load-balancer-powershell

I am seeing similar ones

https://learn.microsoft.com/en-us/answers/questions/338078/how-does-the-load-balancer-work-with-ipv6
KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-15T07:59:22.4033333+00:00
@RAKESH B R

The document you have shared is an alternative way to access the VM as a Load Balancer backend.

The Q&A thread is from 2021 and the answer is outdated.

As next steps,

Can you please try to do a lab with a windows VM?

Can you share the "ifconfig" output for your RHEL VM?

Make sure you explicitly allow your local IP on the NSG of the VM.

Cheers,

Kapil
KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-18T07:48:58.47+00:00

@RAKESH B R

Can you please update us if the action plan provided was helpful?

Should there be any follow-up questions or concerns, please let us know and we shall try to address them.

Thanks,

Kapil
KapilAnanth-MSFT 45,111 Reputation points Microsoft Employee

2023-09-21T09:32:30.46+00:00

@RAKESH B R

May I know if you got a chance to review my previous comment?

Please let me know if you are facing any challenges or if there are any follow-up questions

Thanks,

Kapil

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