Thanks Lee. I wondered about that Link-local only setting. Since the only time I really need Bonjour is within the LAN, I will try that setting. I suspect, as you suggested, that the main slowdown is in my somewhat old Netgear switches, which I plan to upgrade in the near future.
Dan > On Aug 29, 2013, at 4:13 PM, Dan Crutcher wrote: > >> A tech guy was in our offices today checking out our network and he >> recommended that we turn off IPv6 on all our Macs. He said we don't use it, >> as we're on IPv4 and that it slows down the network. >> >> Can anyone out there advise me on whether his information is correct, and if >> so, how does one turn off IPv6? My Network panel has an option to Configure >> IPv6, but the only options offered are Automatically, Manually and >> Link-local only; there's no option to disable or turn off. A Google search >> shows how to turn it off via Terminal commands, but I'm reluctant to do that >> without unless someone I trust can verify that it won't hurt anything. >> >> I suspect this is a question for Lee, whom I trust to know everything >> knowable about all aspects of every kind of computer hardware or software >> ever devised. Don't let me down, Lee! > > I'll do my best. This is sort of a complicated subject. > > I leave it on because Bonjour uses it. This makes it a lot easier to set up > printers and such by discovery instead of having to know IP addresses. It's > also the way the Airport Utility finds an Airport Extreme. > > I suppose the added overhead could slow down Web surfing a tad because most > ISPs aren't IPv6 smart (cough, TWC, cough), but I've never noticed any > difference with the cable Internet, and I've tried it both ways. > > A lot of the possible Web slowdown depends on your router's method for > dealing with IPv6 packets. If you're really worried about it, you could try > setting your Macs and your router to Link-local only. This should keep all > the IPv6 packets inside your LAN. (Link-local only seems kind of like using > the 192.168.xxx.xxx addresses in IPv4.) > > _______________________________________________ > MacGroup mailing list > MacGroup@erdos.math.louisville.edu > http://www.math.louisville.edu/mailman/listinfo/macgroup
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