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DNS: Automatic in Router, Fixed in Client Settings?
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Mac Elite
Join Date: Nov 2003
Location: Rockville, MD
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Offline
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I've noticed that I seem to get the best speeds if I program the IP address of my ISP's DNS server into my client machines but leave my router set for "get DNS automatically". Does this observation jibe with what you MacNN gurus know about networking?
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Mac Elite
Join Date: Oct 1999
Location: San Jose, Ca
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No. The only time this is consulted is when the DHCP leases are taken out/renewed, and that is usually only a few seconds time every day or so. Other than that there should be no difference what so ever.
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Mac Elite
Join Date: Nov 2003
Location: Rockville, MD
Status:
Offline
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Originally Posted by larkost
No. The only time this is consulted is when the DHCP leases are taken out/renewed, and that is usually only a few seconds time every day or so. Other than that there should be no difference what so ever.
Interesting. So it doesn't really matter as long as the proper DNS is listed somewhere appropriate (either System Preferences --> Network) or in the router's settings?
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Mac Elite
Join Date: Oct 1999
Location: San Jose, Ca
Status:
Offline
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As long as the computer is picking up the DNS settings through DHCP: no, not in the least. In some cases the computer will first use the manual (override) settings, and then if those fail start to use the DHCP provided ones, but I don't think that Apple has this particular feature. To be honest, it is not that big a deal.
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Administrator  Join Date: Apr 2001
Location: San Antonio TX USA
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Offline
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I think it depends on the ISP. Some of them are "less prompt" with updating their DHCP servers' DNS address settings than they could be, so their published DNS addresses might be more current than their DHCP-provided addresses. I use SBC, and their automatic data is at least as up to date-sometimes more up to date-than the addresses they publish in their support pages. Like I said, it depends.
Now here's the thing: if the router gets DNS settings from the ISP, but the client is NOT USING DHCP, then it doesn't matter. The only reason for the router to have those addresses is so that it can pass them on to its own DHCP clients. If you've manually set your clients' IPs and such, then they don't get anything from the router's DHCP server, so what the router has doesn't matter. The client uses its own DNS settings, whether you've manually entered them, or the router has provided them via DHCP. The client MUST use its own settings, because it is the client that looks up the octets to match the URL...
There is no advantage in manually setting a client's IP if it's just to give it manual DNS server addresses.
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Glenn -----
OTR/L, MOT, Tx
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