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renluop:
In my last post I was not meaning DNSs other than the ISPs, but the incorrect ones in the ISPs range, e.g
199.106.6.9 instead of 199.106.56.59

Weaver:
Sincere apologies if all of the following is well known.

Well, if you had entered the DNS values wrong, then some things would not work at all because all DNS lookups would fail. Routers usually send out suggested DNS values to machines in the LAN, so if the router had the correct values then that might mean things were ok anyway, unless you managed to override the correct data from the router. Routers often get correct correct DNS values direct values automatically the ISP delivered by the PPP protocol (If using PPP, which many ISPs are). So often one does not have to do anything at all. It is best not to configure DNS values at all, especially in the case where it is in a machine that might be moved around to a different network or change internet connection.

Some services would just work regardless, because they simply know IP addresses that need to be used and do not need to do any DNS lookups because they are not referring to things by domain name at all.

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