Unable to set reverse DNS on public IPv6

DanielSchall-7932 1

Hi all,

I'm trying to set a reverse DNS entry on my static IPv6 address, but it doesn't seem to be supported:

PS /home/user> $pip = Get-AzPublicIpAddress -Name "XXX-Public-IPv6" -ResourceGroupName "RG"

PS /home/user> $pip.DnsSettings.ReverseFqdn = "host.domain.com"

PS /home/user> Set-AzPublicIpAddress -PublicIpAddress $pip

Set-AzPublicIpAddress: Cannot specify reverse fqdn 'host.domain.com' for IPv6 PublicIp '/subscriptions/xxx/resourceGroups/RG/providers/Microsoft.Network/publicIPAddresses/XXX-Public-IPv6'.

StatusCode: 400

ReasonPhrase: Bad Request

ErrorCode: CannotSpecifyReverseFqdnForIpV6PublicIp

ErrorMessage: Cannot specify reverse fqdn 'host.domain.com' for IPv6 PublicIp '/subscriptions/xxx/resourceGroups/RG/providers/Microsoft.Network/publicIPAddresses/XXX-Public-IPv6'.

OperationID : 2f1f2516-8aaa-453f-a4de-e62ffcb4fc89

This works for IPv4 addresses, and there's no way to do this on the Portal, so I'm stuck.

What am I doing wrong?

How do I set a reverse DNS entry for my IPv6 addresses?

Thanks,

Daniel

GitaraniSharma-MSFT 48,011 Reputation points Microsoft Employee

2024-01-03T07:40:36.69+00:00
Hello @DanielSchall-7932 ,

Azure supports two separate scenarios relating to reverse DNS:

Hosting the reverse lookup zone corresponding to your IP address block - Azure DNS can be used to host your reverse lookup zones and manage the PTR records for both IPv4 and IPv6. The process of creating the reverse lookup (ARPA) zone, setting up the delegation, and configuring PTR records is the same as for regular DNS zones. The differences are the delegation must be configured with your ISP rather than your DNS registrar, and only the PTR record type should be used.

Configure the reverse DNS record for the IP address assigned to your Azure service - Azure enables you to configure the reverse lookup for the IP addresses given to your Azure service. This reverse lookup gets configured by Azure as a PTR record in the corresponding ARPA zone. These ARPA zones, corresponding to all the IP ranges used by Azure, are hosted by Microsoft.

Refer: https://learn.microsoft.com/en-us/azure/dns/dns-reverse-dns-overview#azure-support-for-reverse-dns

If you want to host reverse DNS lookup zones for your assigned IP ranges (these IP ranges must be assigned to your organization, typically by your ISP) with Azure DNS, then you can host an IPv6 reverse lookup zone.

Refer: https://learn.microsoft.com/en-us/azure/dns/dns-reverse-dns-hosting#ipv6

But if you want to configure reverse DNS record for an IPv6 Public IP address assigned to your Azure service, which is owned by Microsoft, then as mentioned below by @Luke Murray , it is not possible as of today.

Refer: https://learn.microsoft.com/en-us/azure/dns/dns-reverse-dns-for-azure-services#can-i-configure-reverse-dns-for-ipv6-publicipaddress-resources

If you wish you may upvote the feedback in the below forum requesting this feature. All the feedback you share in these forums will be monitored and reviewed by the Microsoft engineering teams responsible for building Azure.

https://feedback.azure.com/d365community/idea/10d93355-4bc6-ed11-a81b-6045bd79fc6e

Kindly let us know if it helps or you need further assistance on this issue.

Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
GitaraniSharma-MSFT 48,011 Reputation points Microsoft Employee

2024-01-10T12:45:35.3633333+00:00

@DanielSchall-7932 , Could you please provide an update on this post?

Kindly let us know if the above helps or you need further assistance on this issue.

1 answer

Luke Murray 10,611 Reputation points MVP

2024-01-01T19:48:27.2+00:00

Hi, Daniel

Unfortunately, you can't enable Reverse DNS for IPV6 at this time, I believe it's definitely being looked at, as Microsoft are working on parity, but have no timelines.

Can I configure reverse DNS for IPv6 PublicIpAddress resources?

No. Azure currently supports reverse DNS only for IPv4 PublicIpAddress resources and Cloud Services.

Reference: Configure reverse DNS for services hosted in Azure
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