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One possible fix for internet connections that drop out
Authored by: Alnitak on Jul 02, '08 09:29:22AM
the OS may be trying to contact the router rather than the DNS server of the ISP.

It's the DHCP response from the router is what tells the OS what to use. Until that response is received the Mac will actually have no DNS settings and any DNS lookups will fail. Also, if you override the DHCP settings with static addresses then you'll need to change those settings any time you connect via a different network.

In most cases the address given will be its own address, and the router will contain a DNS proxy which forwards the requests to the ISPs upstream DNS servers.

nb: most routers don't proxy DNS over TCP, they only to UDP. This means that extra large DNS responses which get truncated can't be returned.

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