Tomato Firmware Dual Wan Force Dns Out One Wan

Tomato Firmware Dual Wan Force Dns Out One Wan

XIV. Miscellaneous Questions

Configure Router-level DNS Servers with Force DNS Setting

What does Router-level DNS mean?

DNS or Domain Name Servers are essential to locate servers / services on both the Internet and on local / domain networks.

To enable many elements of their functionality, DrayTek Vigor routers manage DNS for router services and client connections separately. This means that the DNS servers that clients are assigned by the router’southward DHCP server can differ from the servers that the router uses. You can learn more near the way that DNS is handled for customer connections on DrayTek routers

  • Customer DNS:When a client on the network performs a DNS lookup, it volition exercise then with the DNS servers the customer is configured to use.
  • Router DNS:
    DNS servers in
    [Online Status] > [Concrete Connectedness] are used when the router performs a DNS lookup for services
    such as VPN.

To permit for reliabile functionality of the router’s services when multiple ISPs are used for load balancing and failover, the router defaults to using Google’south Internet service provider-agnostic open DNS servers:

    • 8.viii.viii.8

These servers will work well for full general Internet admission. Simply whatsoever hostnames of services, or servers on an internal network, could not be used past the router. If the DrayTek router needs to be able to locate the IP of an internal server via its hostname, the router would need to exist configured to use the “Forcefulness router to apply “DNS server IP accost” settings specified in
” which can be found on the
[LAN] > [General Setup] page.

By and large, the router’s services that can use DNS to lookup IP addresses, include (only are non limited to) these services:

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Router Service How information technology uses DNS
VPN Punch-Out VPNs perform DNS lookups when connecting a VPN tunnel, to locate the IP accost of a remote VPN server.
VigorACS If the VigorACS server is specified as a hostname, connectivity to VigorACS requires DNS lookup.
MyVigor Services & Content Filtering Activation of services through the MyVigor system, such Content Filtering.

The Spider web Content Filter performs a DNS lookup to locate the all-time regional server for content filter checks
NTP Fourth dimension Servers The router’s time defaults to using “”, this looks upward the correct IP.
Syslog Server Syslog messages sent by the router can become to a hostname.
Mail Alert & Mail Syslog Mail Server hostnames are looked upwards with the router’due south DNS.
LDAP, RADIUS, TACACS+ Authentication If a hostname is entered, it will expect up the IP address of the RADIUS / LDAP / TACACS+ server to perform hallmark.
DrayDDNS, Dynamic DNS & LetsEncrypt Updating the router’s dynamic DNS address requires performance DNS to locate the MyVigor server.
Dynamic DNS services may have their own servers that require DNS lookup to locate.
Ping Diagnostics Pinging a hostname will lookup the IP address of the host, and so ping. This can be helpful for troubleshooting DNS issues relating to the above services

If any of those services demand to lookup an internal network hostname to operate, information technology’southward necessary to alter the router’s DNS servers to the internal DNS server of the network. Make sure that if an internal DNS server is used, that it can be used for regular Internet DNS lookups, otherwise the router’s functionality may exist limited by unworkable DNS.

If the router’south DNS server settings are unworkable or not compatible with the Isp, any of the above services may be unable to function where hostnames are used.

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How to change the router’s DNS server?

To brand a DrayTek Vigor router use a DNS server of your choosing, simply go to
[LAN] > [General Setup] to begin.

In the General Setup department, the multiple LANs of the DrayTek router can be configured. Out of the box, the router does not take VLANs enabled, so only LAN1 & the DMZ Port will be configurable. Enable
[LAN] > [VLAN] to access all LAN interfaces.

If the DNS servers to be used on the router are ones that should non be assigned to clients, utilize a LAN subnet that is non assigned to whatsoever LAN ports. This could be the DMZ Port (even when left disabled) or one of the LAN1-LAN8 networks.

Click on the
Details Page
button for the LAN subnet that will accept the DNS server addresses configured:

Tomato Firmware Dual Wan Force Dns Out One Wan

In the settings page for the LAN interface, the
DNS Server IP Address
section tin can specify a Primary and Secondary IP address for DNS usage. These are ordinarily assigned to clients in that LAN subnet by the router’s DHCP server.

Specify the DNS servers you’d similar to use here. And then click OK to salve the modify. It should not require a restart if that’south the only setting being changed.


Then get back to
[LAN] >

[General Setup].

Tick the checkbox for “Strength router to employ “DNS server IP address” settings specified in”. Click on the drop-down and select the LAN interface that the preferred DNS servers were merely configured within.

Then click OK to use that change.


To cheque whether the new DNS settings accept taken effect, go to
[Online Status] > [Physical Connection].

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The DNS servers that the router will use for its ain services are shown equally the Router Main DNS and Router Secondary DNS addresses. These should now bear witness the DNS addresses that were but configured, instead of the router’s default of 8.viii.8.eight and viii.eight.iv.four.

From there, it’s recommended to test that these new DNS servers tin can be used past the router.


Testing & Troubleshooting the Router’due south DNS servers

To test whether the router can lookup or locate IP addresses from hostnames, whether addresses on the Cyberspace or internal, the router’s
[Diagnostics] > [Ping Diagnosis] tool tin can be used.

To check whether a specific hostname, or general DNS lookups are working from the router itself, but enter a hostname or web address into the IP Address field and click Run. That will practice a DNS lookup for the IP and then ping information technology. If the router tin’t locate the hostname or IP, endeavour specifying the Ping through Interface that should be used. Then bank check whether the router’southward DNS server addresses are right.

Pings tin also fail if the remote host/IP is blocking them, which is the default for a DrayTek Vigor router’south WAN IP (configured in [Organization Maintenance] > [Management]). If it’s a PC, information technology could exist the Windows Firewall, which will block pings coming from outside the computer’s local network, for instance over a VPN. The router local to that computer should be able to ping equally information technology’s on the local network.


How exercise yous charge per unit this commodity?

Tomato Firmware Dual Wan Force Dns Out One Wan

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