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andrewdixon1000

76 posts

Master Geek


#319608 13-May-2025 10:42
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Hi,

 

I am a Skinny customer with a VRV9517 (I think that's a Smart Modem 1).  I've set up Adguard Home and I want to change the DNS server settings for DHCP in the router to point to it, but I'm not having luck.

 

The router is running firmware v6.00.18 build02.

 

On the LAN settings page in the router admin I've added my Adguard Home server's IP address (10.76.0.10) into the "Primary DNS" field and I have the "ISP DNS" checkbox unchecked.  I've tried this with the "Customer DNS" checkbox checked and with it unchecked (it's not clear to me what this checkbox does).  In all cases I continue to see the router's IP address (10.76.0.254) as the DNS server on my DHCP connected devices.

 

In the router log file I see the following after a reboot:

 

Jan  1 12:00:21 VRV9517 syslog.info syslogd started: BusyBox
Jan  1 12:00:22 VRV9517 user.info autowandetect: AWD_Main pid:2318
Jan  1 12:00:22 VRV9517 daemon.err dhcpd: /etc/dhcpd-br0.conf line 17: . (46): expecting IP address or hostname
Jan  1 12:00:22 VRV9517 daemon.err dhcpd:   option domain-name-servers 10.76.0.10, .
Jan  1 12:00:22 VRV9517 daemon.err dhcpd:                                           ^
Jan  1 12:00:22 VRV9517 daemon.err dhcpd: Configuration file errors encountered -- exiting

 

 

 

Is there anybody familiar with this hardware who can shed some light on what I might be doing wrong?

 

Thanks

 

Andrew

 

 


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Tinkerisk
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  #3372772 13-May-2025 13:31
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Without knowing your network in detail: It is nothing unusual if the router remains the general DNS server for the clients in the LAN, and it forwards its queries to its ‘buddy’ and also receives them back from it. Custom DNS on, ISP DNS off, reboot router.





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toejam316
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  #3372775 13-May-2025 13:54
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It sounds like you may have set your WAN DNS server to your Adguard host, while your LAN DHCP server is still serving your router as the DNS server. You will want to swap this around so that the WAN DNS is still ISP assigned, and the LAN DHCP is issuing your Adguard host.





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andrewdixon1000

76 posts

Master Geek


  #3372957 14-May-2025 07:52
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toejam316:

 

It sounds like you may have set your WAN DNS server to your Adguard host, while your LAN DHCP server is still serving your router as the DNS server. You will want to swap this around so that the WAN DNS is still ISP assigned, and the LAN DHCP is issuing your Adguard host.

 

 

 

 

There is a separate DNS setting in the WAN settings but this is blank.  The setting I've been trying is for the LAN.




andrewdixon1000

76 posts

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  #3372958 14-May-2025 07:54
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Tinkerisk:

 

Without knowing your network in detail: It is nothing unusual if the router remains the general DNS server for the clients in the LAN, and it forwards its queries to its ‘buddy’ and also receives them back from it. Custom DNS on, ISP DNS off, reboot router.

 

 

That's what I thought at first too, but Adguard Home is not receiving any DNS requests, except when I specifically address them to it via a dig command.


Tinkerisk
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  #3373395 15-May-2025 04:07
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I would assign the AdGuard instance IP to the system (WAN) DNS, force the DHCP to issue the router IP as the LAN’s DNS for the clients and within AdGuard the relevant external DNS servers you want to use (i.e. 9.9.9.9 or whatever - I have unbound as a recursive own DNS dealing with the public root DNS servers directly).

 

This is what works here, but I don‘t know, wether your router is able to handle it or not.





- NET: FTTH & VDSL, OPNsense, 10G backbone, GWN APs
- SRV: 12 RU HA server cluster, 0.1 PB storage on premise
- IoT:   thread, zigbee, tasmota, BidCoS, LoRa, WX suite, IR
- 3D:    two 3D printers, 3D scanner, CNC router, laser cutter


rhy7s
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  #3373397 15-May-2025 06:09
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Can you disable DHCP on the LAN from the Smart Modem and set up the device running AdGuard as your DHCP server?


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