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No DNS reply on gateway ipv6 link local address

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No DNS reply on gateway ipv6 link local address

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No DNS reply on gateway ipv6 link local address
No DNS reply on gateway ipv6 link local address
2025-07-23 12:20:45 - last edited 2025-07-29 03:19:40
Tags: #IPv6 #DNS
Model: ER8411  
Hardware Version: V1
Firmware Version: 1.32

Hi, 

 

We currently have a dual stack setup at the office. 

 

We use the router as the dns cache as well. It is configured using an OC200 controller.

 

It works as expected with ipv4, ie we set the dns server on our clients via dhcp, specifiying gateway address as the dns server, works very well.

 

However, this does not work with the gateway's link local ipv6 address. We are able to ping the gateway's ipv6 link local address, no problems, but dns queries to this address times out. 

 

Using the routers public ipv6 address won't work well as it changes every week or so. 

 

Other routers support this, eg, Mikrotik, ZTE etc.

 

Is there a way to set this up or enable it? 

 

Thanks. 

 

lt

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#1
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1 Accepted Solution
Re:No DNS reply on gateway ipv6 link local address-Solution
2025-07-29 04:15:51 - last edited 2025-07-29 04:16:18

Well, that's a shame, and it's definitely not a solution.

 

The ER8411 has a pretty rich feature set for its dns cache and dns proxy, being able to use doh, dot etc

 

But what you say is that if I am on a dual stack network, and most networks these days are, I have to use a different dns server, local or public, for query resolution on an ipv6 address, which I might add, am forced to specify in the routers LAN ipv6 config.

 

In that case the Mikrotik CCR2004-16G-2S+ is a much better option in this price range and yes, this and all other Mikrotik routers answer dns queries on both its ipv4 and ipv6 link local addresses, IF i choose to specify one, if not, clients on the network will just use the router's ipv4 address. 

 

Anyway, thanks for the replies. 

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Re:No DNS reply on gateway ipv6 link local address
2025-07-25 00:29:18

  @redskill 

You might need a public IPv6.
Also, I need to know where you configure this v6 DNS. 

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Re:No DNS reply on gateway ipv6 link local address
2025-07-25 02:04:19

  @Clive_A I am configuring it at the LAN settings>Default>Configure IPV6. 

 

I use SLAAC+RDNSS, but the situation is the same with SLAAC +Stateless DHCP

I have to enter an ipv6 dns, or it will default to the ISP's ipv6 dns server. 

 

Ideally, I would enter the ER8411's link local address here, but since the ER8411 does not respond to dns queries on its link local ipv6 address, I am forced to enter something else. 

 

It would actually be better if it was optional, ie. I am not forced to enter something, just leave it empty. This way, there would be no ipv6 dns server setting propagated and all my clients would just use the ipv4 dns server, which I could easily just put in the ER8411's ipv4 Lan address, eg 192.168.88.1

 

This way, I will be able to use the ER8411 as the dns server for the network. 

 

Having to enter an IPV6 dns server, and not being able to use the ER8411's link local address, breaks this. 

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#3
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Re:No DNS reply on gateway ipv6 link local address
2025-07-29 03:09:04 - last edited 2025-07-29 04:16:24

  @redskill 

redskill wrote

  @Clive_A I am configuring it at the LAN settings>Default>Configure IPV6. 

 

I use SLAAC+RDNSS, but the situation is the same with SLAAC +Stateless DHCP

I have to enter an ipv6 dns, or it will default to the ISP's ipv6 dns server. 

 

Ideally, I would enter the ER8411's link local address here, but since the ER8411 does not respond to dns queries on its link local ipv6 address, I am forced to enter something else. 

 

It would actually be better if it was optional, ie. I am not forced to enter something, just leave it empty. This way, there would be no ipv6 dns server setting propagated and all my clients would just use the ipv4 dns server, which I could easily just put in the ER8411's ipv4 Lan address, eg 192.168.88.1

 

This way, I will be able to use the ER8411 as the dns server for the network. 

 

Having to enter an IPV6 dns server, and not being able to use the ER8411's link local address, breaks this. 

This is expected behavior. As for the V6, you gotta use a public or private-hosted v6 DNS server for it. Or it does not resolve v6 properly with the link local filled in the DNS server.

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#4
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Re:No DNS reply on gateway ipv6 link local address-Solution
2025-07-29 04:15:51 - last edited 2025-07-29 04:16:18

Well, that's a shame, and it's definitely not a solution.

 

The ER8411 has a pretty rich feature set for its dns cache and dns proxy, being able to use doh, dot etc

 

But what you say is that if I am on a dual stack network, and most networks these days are, I have to use a different dns server, local or public, for query resolution on an ipv6 address, which I might add, am forced to specify in the routers LAN ipv6 config.

 

In that case the Mikrotik CCR2004-16G-2S+ is a much better option in this price range and yes, this and all other Mikrotik routers answer dns queries on both its ipv4 and ipv6 link local addresses, IF i choose to specify one, if not, clients on the network will just use the router's ipv4 address. 

 

Anyway, thanks for the replies. 

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#5
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