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Amiga Future

DNS issues (I think), can I keep DHCP but use static DNS?

 
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spud
Grade reingestolpert
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Joined: 04 Feb 2015
Posts: 1


PostPosted: 22.12.2017 - 23:27    Post subject: DNS issues (I think), can I keep DHCP but use static DNS? Reply with quote

In my LAN I have a NAS acting as local DNS server (proxying real dns servers). My cablemodem (= default gateway & local DHCP server) lists this NAS as primary DNS server.

Now my Amigas tend to have some difficulty with the NAS dns server. Also Roadshow, when set to dhcp, I think. Somehow dns lookups work only one boot in many. All other boots dns lookups don't work.

Now I could setup the Amiga with a fully static config, but frst I hoped I could still use dhcp to get IP, gateway & subnetmask and set static DNS servers. Unfortunately these static dns servers seem to be lower in priority than the dhcp retrieved dns servers? Is there a way to overrule the dhcp retrieved dns servers? Or do I really have to disable dhcp?
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olsen
CygnusEd Developer


Joined: 06 Jun 2006
Posts: 108


PostPosted: 02.01.2018 - 11:25    Post subject: Re: DNS issues (I think), can I keep DHCP but use static DNS Reply with quote

spud wrote
In my LAN I have a NAS acting as local DNS server (proxying real dns servers). My cablemodem (= default gateway & local DHCP server) lists this NAS as primary DNS server.

Is this strictly necessary? I am asking because normally, your ISP would suggest which DNS servers to use, and these are commonly caching responses and respond most quickly to queries from your home network. The downside to using the ISP-provided DNS servers is that some (many?) ISPs will not transparently resolve queries but insert their own responses.

Can you replace the DNS server which your NAS uses? It's possible that the problem is not so much with the NAS, but with the DNS server it delegates its queries to.

Quote:
Now my Amigas tend to have some difficulty with the NAS dns server. Also Roadshow, when set to dhcp, I think. Somehow dns lookups work only one boot in many. All other boots dns lookups don't work.

This could be caused by DNS lookups taking too long to complete. Lookups must succeed within five seconds after a query is sent. Hard to tell if this is cause, though

Quote:
Now I could setup the Amiga with a fully static config, but frst I hoped I could still use dhcp to get IP, gateway & subnetmask and set static DNS servers. Unfortunately these static dns servers seem to be lower in priority than the dhcp retrieved dns servers? Is there a way to overrule the dhcp retrieved dns servers? Or do I really have to disable dhcp?

Yes, I am afraid this is the only solution available right now. The DNS servers provided through the DHCP negotiation do take priority over the statically configured DNS servers. I made the choice back then because misconfiguration of the static DNS servers tends to be a bigger problem than DHCP configuration of the servers to use. Giving the user a choice which servers to prefer would be possible, but that won't be a feature which is likely to become available soon enough
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