Brightbox - DNS functionality

portman — Mon, 04 Oct 2021 13:53:52 GMT

Hi,

Should a brightbox router 1R on home broadband have full DNS functionality,

I have just got an ipad that I tried to connect to shares on my windows and raspberry pi (with samba) using SMB.

This worked using ip address but failed using computer names, with name not found.

The router is providing DHCP functionality and looking at the router admin pages all names are registered correctly and show with correct IP

I researched more and using wireshark on the pi it seems that name requests to the router are not actioned.

Thanks

Re: Brightbox - DNS functionality

XRaySpeX — Mon, 04 Oct 2021 17:02:51 GMT

DNS don't hold computer names & suchlike. It's all down to Samba & the internal addressability of your devices.

Re: Brightbox - DNS functionality

mikeliuk — Mon, 04 Oct 2021 19:09:46 GMT

Hi @portman ,

It seems that you want to make dynamic updates to your local DNS and you will need a local DNS and DHCP server which supports this, such as Windows Server 2019.

https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-dns-dynamic-updates-windows-server-2003

You may find a way to do this if you run your DHCP server and DNS on your pi instead. Pi-hole doesn't seem to do it as part of the stock experience but there should be a suitable DHCP package to achieve it.

https://discourse.pi-hole.net/t/dhcp-dynamic-dns-update-to-pihole/34515

Re: Brightbox - DNS functionality

portman — Sun, 10 Oct 2021 13:40:20 GMT

i, thanks for the responses, I'm not sure if I expressed myself clearly.
The windows PC's network and samba use SMB and Wins to identify themselves and interconnect.
The Brightbox runs as the DHCP server providing their IP address and sets itself as the gateway and DNS server and has the forwarding ISP address.
I would have expected it to have resolved address lookups on the local domain only forwarding unresolved requests.
I show below the wireshark output for a request from the pi to ping cvhome81 and ipadcv which were on the local network. I have also attached the equivalent output using the BT homehub which resolved the address correctly to allow both SMB and HTTP connections.
It should be noted that the source and destination fields on the homehub are resolved whereas the EE ones aren't.
The BThomehub has home as the domain name rather than the normal local which seems fixed.

EE Brightbox
No Source Destination Protocol Info
1 192.168.1.128 BrightBox.ee DNS Standard query 0x8f07 A cvhome81 OPT
2 BrightBox.ee 192.168.1.128 DNS Standard query response 0x8f07 No such name A cvhome81 SOA a.root-servers.net OPT
3 192.168.1.128 BrightBox.ee DNS Standard query 0xbb86 PTR 128.1.168.192.in-addr.arpa
4 192.168.1.128 BrightBox.ee DNS Standard query 0x493c PTR 1.1.168.192.in-addr.arpa
5 BrightBox.ee 192.168.1.128 DNS Standard query response 0x493c PTR 1.1.168.192.in-addr.arpa PTR BrightBox.ee
6 BrightBox.ee 192.168.1.128 DNS Standard query response 0xbb86 No such name PTR 128.1.168.192.in-addr.arpa SOA localhost
7 4c:1b:86:6b:d2:d4 b8:27:eb:bf:87:62 ARP Who has 192.168.1.128? Tell 192.168.1.1
8 b8:27:eb:bf:87:62 4c:1b:86:6b:d2:d4 ARP 192.168.1.128 is at b8:27:eb:bf:87:62
9 b8:27:eb:bf:87:62 4c:1b:86:6b:d2:d4 ARP Who has 192.168.1.1? Tell 192.168.1.128
10 4c:1b:86:6b:d2:d4 b8:27:eb:bf:87:62 ARP 192.168.1.1 is at 4c:1b:86:6b:d2:d4
11 4c:1b:86:6b:d2:d4 ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.127? Tell 192.168.1.1
12 4c:1b:86:6b:d2:d4 ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.127? Tell 192.168.1.1
13 4c:1b:86:6b:d2:d4 ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.127? Tell 192.168.1.1
14 192.168.1.128 B rightBox.ee DNS Standard query 0xfcd7 A ipadcv OPT
15 BrightBox.ee 192.168.1.128 DNS Standard query response 0xfcd7 No such name A ipadcv SOA a.root-servers.net OPT
BT Homehub
No Source Destination Protocol Info
1 cvpi api.home DNS Standard query 0x9c04 A cvpi OPT
2 api.home cvpi DNS Standard query response 0x9c04 A cvpi A 192.168.1.128
3 cvpi api.home DNS Standard query 0xca82 PTR 1.1.168.192.in-addr.arpa
4 api.home cvpi DNS Standard query response 0xca82 PTR 1.1.168.192.in-addr.arpa PTR BThomehub.home PTR btbroadband.home PTR api.home
5 b8:27:eb:bf:87:62 3c:81:d8:71:0c:a0 ARP Who has 192.168.1.1? Tell 192.168.1.128
6 3c:81:d8:71:0c:a0 b8:27:eb:bf:87:62 ARP 192.168.1.1 is at 3c:81:d8:71:0c:a0
7 cvpi api.home DNS Standard query 0x1773 A cvhome81 OPT
8 api.home cvpi DNS Standard query response 0x1773 A cvhome81 A 192.168.1.220
9 3c:81:d8:71:0c:a0 b8:27:eb:bf:87:62 ARP Who has 192.168.1.128? Tell 192.168.1.1
10 b8:27:eb:bf:87:62 3c:81:d8:71:0c:a0 ARP 192.168.1.128 is at b8:27:eb:bf:87:62
11 cvpi api.home DNS Standard query 0xc0a4 A ipadcv OPT
12 api.home cvpi DNS Standard query response 0xc0a4 A ipadcv A 192.168.1.126
13 8e:24:ff:61:9b:50 ff:ff:ff:ff:ff:ff ARP Who has 192.168.1.220? Tell 192.168.1.126

Thanks

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