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Posts: 8
Registered: ‎12-23-2017

DNS problems after the link failover in LRT224

I have the next configuration in LRT224. IPv4/Subnet mask: 10.0.0.1/255.255.255.0;

Main connection Wan1: gateway 77.37.156.1, DNS 77.37.251.33;

Reserve Wan2: gateway 192.168.1.1, DNS 192.168.1.1. In Wan2 due to the modem-router of the reserve provider LRT224 operates as second NAT. In Wan1 the lan has only one NAT in LRT224.

LRT224 operates without problems in the case of the short link fails. But in the case of the long link fail at the return to Wan1 LRT224 DNS becomes non-operating.

I have two options. Link fail of Wan1, then LRT224 DNS after Wan2 is ok. Or I need reboot LRT224.

I cannot understand. Why is the problem with DNS in LRT224 only at Wan1 single NAT, but not at Wan2 with dual NAT? Second question. How do specify the auto reboot of LRT224?

Thanks.

Expert
Posts: 13,611
Registered: ‎01-18-2013

Re: DNS problems after the link failover in LRT224

Are you using the LRT as your LAN DNS Server? If you are I don't recommend that instead have a domain DNS Server, ISP DNS Servers or Public DNS Servers in your DHCP Settings. This should resolve your issue.


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Linksys
Communities Technical Support
Posts: 8
Registered: ‎12-23-2017

Re: DNS problems after the link failover in LRT224

[ Edited ]

No, LRT224 is using DNS server by the provider in the case Wan1. In the case Wan2 LRT224 uses DNS server from the modem-router by the reserve provider. The "black-box" modem-router passes addresses from the reserve provider.

Yes, I know about the possibility Public DNS, but I prefer the defaut selection --- both DNS from providers:

Interface Connection Type Configuration

WAN1    Obtain an IP automatically    [Edit]     
WAN2    Obtain an IP automatically    [Edit]

Expert
Posts: 13,611
Registered: ‎01-18-2013

Re: DNS problems after the link failover in LRT224


alexei2017 wrote:

No, LRT224 is using DNS server by the provider in the case Wan1. In the case Wan2 LRT224 uses DNS server from the modem-router by the reserve provider. The "black-box" modem-router passes addresses from the reserve provider.

Yes, I know about the possibility Public DNS, but I prefer the defaut selection --- both DNS from providers:

Interface Connection Type Configuration

WAN1    Obtain an IP automatically    [Edit]     
WAN2    Obtain an IP automatically    [Edit]


I'm not sure by your reply that you understand that I'm recommending you make changes to your LRT DHCP Server settings.


Smiley Wink Please remember to Kudo those that help you.

Linksys
Communities Technical Support
Posts: 8
Registered: ‎12-23-2017

Re: DNS problems after the link failover in LRT224

I am using the default configurations of Wan1 and Wan2 in LRT224 for IP, Gateway, and DNS.

Only small specific LAN is 10.0.0.1/255.255.255.0 with double NAT in the case Wan2.

Without working DNS servers LRT224 can not send regular e-mail reports.

From PC inside LAN I can restart LRT224 to solve the problem with the DNS in the router.

Posts: 8
Registered: ‎12-23-2017

Re: DNS problems after the link failover in LRT224

Wan2 has the feature the double NAT, but also Wan1 is specific. Wan1 has static IPv4, and also I found IPv6 in it. I selected Dual stack IP in LRT224. Now LRT224 transfers between LAN1 and LAN2 without DNS problems with default DNS by providers.

Highlighted
Posts: 8
Registered: ‎12-23-2017

Re: DNS problems after the link failover in LRT224

I wrote for WAN1 provider's DNS servers by hands. Now I have not problems with the return to WAN1.