Hi @SomeNetEngineer 

Thanks for posting in our business forum.

Have you examined the firewall on your router? Specifically, I mean the IGMP ping-related firewall. Can you paste a screenshot indicating these are allowed?

The router supports it and it should work as we have tested it.

Hi @SomeNetEngineer 

SomeNetEngineer wrote

  @Clive_A It's not a ping/firewall issue, it's a DNS issue. 

 

I have a Windows machine with hostname "SERVER1" on the network, where the router (ER8411) has IP 172.18.0.1.

 

Running `nslookup SERVER1 172.18.0.1`, which forces it to use the router as the DNS server, returns:

```

Server:  UnKnown
Address:  172.18.0.1

*** UnKnown can't find SERVER1: Non-existent domain

```

 

Other (normal) DNS queries with this same command, e.g.

```

> nslookup tp-link.com 172.18.0.1
Server:  UnKnown
Address:  172.18.0.1

Non-authoritative answer:
Name:    tp-link.com
Addresses:  2600:9000:215f:7400:0:275e:4840:93a1
          2600:9000:215f:7a00:0:275e:4840:93a1
          2600:9000:215f:6c00:0:275e:4840:93a1
          2600:9000:215f:9000:0:275e:4840:93a1
          2600:9000:215f:8600:0:275e:4840:93a1
          2600:9000:215f:5200:0:275e:4840:93a1
          2600:9000:215f:800:0:275e:4840:93a1
          2600:9000:215f:dc00:0:275e:4840:93a1
          54.192.51.8
          54.192.51.93
          54.192.51.2
          54.192.51.85

```

I know what you are saying or the things you refer to.

There is no issue with the NetBIOS. Like I said, it worked.

One Work PC, one my laptop.