DNS Settings for routed subnets

[robknowles]

Hello,

 

I'm currently implementing routing within our network, via a subnet range on each VLAN for a specific set of devices - such as a VLAN for Servers, VLAN for Management Ports on Switches Devices, VLAN for VoIP etc.

 

My question is, what's the best way for defining the DNS Settings for devices, in regards to, do I add a IP address to the adaptor for each of our DNS Servers for each VLAN?

 

So if I have:

 

VLAN 1, range 172.16.0.0 to 172.16.7.255

VLAN 2, range 172.16.8.0 to 172.16.15.255

VLAN 3, range 172.16.16.0 to 172.16.23.255

VLAN 4, range 172.16.24.0 to 172.16.31.255

 

Our DNS Server IP Adaptor will have an IP for each VLAN, such as 172.16.0.2, 172.16.8.2 etc.

 

Devices in VLAN 1, where they require DNS Settings inputted would have 172.16.0.2, Devices in VLAN 2, would have 172.16.8.2

 

Is this best? Or simply have them pointing to the IP's even if they are on seperate subnets.

 

Thanks,

 

Rob

[keithu]

There's no need for the DNS server to have an interface (and IP address) on every subnet. If your DNS server is at 172.16.0.2, for instance, just use that IP address in the DNS Settings for each device regardless of subnet. Provided you have configured routing between the VLAN 1 subnet and all the others it will work fine.

[imiddleton25]

Keithu is right no need. we have the setup you are planning and on the DNS side we use the 2 DNS servers for 8 vlans we run here.

[spc-rocket]

Hi,

 

Yes agree with others on this, you only need the IP for the DNS server and use this for dns settings for each vlan.

 

Ash.

[robknowles]

Hello,

 

OK, I'll go with the one IP Address. Will make it easier to support and setup that way.

 

Thanks,

 

Rob