DNS Flakiness

I have had a wireless internet ISP since purchasing my G5 iMac a few years ago. I had problems with unresponsive web page loadings which were fixed by manually entering my ISP's DNS server settings.
I have since upgraded from Tiger to Leopard 10.5.2 on the G5 as well as purchasing a Macbook with the same system installed. I have started having the same problems as before with certain web pages not loading while others would and web sites working fine for 5 minutes and then stop working.
I then replaced my Netgear router with an Apple Airport Extreme with no change. I then called my ISP who had me put in the DNS server address for OPEN DNS into the Airport Extreme to only slightly better responsiveness.
I know the internet connection is good because I use Microsoft's Remote Desktop connection extensively to my office and have had no problems. Also, all of my podcasts seem to download just fine on iTunes. I understand that these do not use DNS. I know my Macbook is fine because it works flawlessly at my two other offices, one of which has an Airport Extreme router also.
As an example, I had a dickens of a time logging onto apple.com, it kept going to opendns.com instead. Yet, cnn.com and wikipedia would work fine.
I have read many DNS problems from others, but do not see any solutions.
Thanks......

I don't think the problem you are having has anything to do with Leopard. More likely something with your network connection or ISP. Since you have had DHCP problems with your ISP in the past (DHCP automatically sets your network configuration including the DNS address(es)). Run AirPort Utility, open the Internet icon, call up your ISP and check with them that the settings you see for the AirPort are correct. This should be where the DNS settings should be made, BTW, not on the Macs. The Macs should use DHCP to get the information from the AirPort.

Similar Messages

The internet coming from my AirPort Extreme, which is extended by an AirPort Express and my Time Capsule, is being very flaky. It is dropping and I have to reconnect every few minutes. Any solutions?

To be more detailed, my AirPort Extreme needs to be extended by an AirPort Express, which then is extended to my personal Time Capsule. The internet drops on my MacBook Pro and other MacBook Pros randomly. We then reconnect with no problem and go on with what we were doing. The internet is fine. Always able to connect. We have Open DNS set up as well. But the flaky internet is annoying. Any ideas how to fix this?

The primary issue that you will need to contend with is the distance between routers. 300' would be at the fringe of the signal coming from the base station located in the house which, most likely, make it too "weak" to extend/repeat with the second base station at the shop.
There is a method to configure a relay base station between them in a Wireless Distribution System (WDS), but a WDS has two major drawbacks: 1) It can only operate in the 802.11g Radio Mode, and 2) For every base station participating in the WDS, the overall bandwidth will be cut in half .., so with a total of three (main, relay, & remote), the maximum of 54 Mbps (for 802.11g) would be more like 15-17 Mbps. If you plan on streaming HD video (either 720p or 1080p), your local wireless network may not have enough bandwidth to do so successfully.
You proposal to run the DSL line to the shop does offer another option. Instead of running a DSL line, run an Ethernet cable between the house and the shop. You would connect one end to any of the available LAN ports on the AirPort Extreme to the Ethernet port on the AirPort Express. You can then configure both base stations into a roaming network and not have bandwidth loss of the WDS.

Active Directory client not dynamically updating DNS

Hi,
There has been some other issues mentioned on other threads regarding the Active Directory Plugin within Lion, it does appear to be flaky.
I just wanted to make sure that the issue I'm having is not down to a mis-config by myself.
We have several Macs running 10.7.1 and are bound into Active directory (Windows 2008 r2) however, it appears that the DNS records for these machines are not being dynamically created within AD. (All Zones are AD intergrated) All 10.6.x clients seem to work fine and records are created and updated dynamically as IPs change etc.
Is anybody else having this issue? If not, any ideas why this is happening?
Thanks in advance.

Hi!
I'm having exactly the same problem and nobody seems to have an answer.
Regarding the reply you got, this has nothing to do with Lion Server. We're talking about Lion clients bound to an AD (Windows Server 2008 R2, in my case) not dynamically registering their DNS entries.
I also noticed that the DHCP entries for those clients are missing the "Name" property, which is already symptomatic of something going wrong.
Anyone?

DNS issues since ML upgrade

Running Mac mini less than a month old, ordered direct from Apple.
Performed upgrade to ML over the weekend, since then I have had problems with the DNS lookup - with both Safari and Chrome. Mail seems to be OK. The weirdest part is that a reboot of the machine solves the problem for a time, and then it reoccurs. Chrome gives the error message that DNS is at fault.
Needless to say this is an irritating issue. Any ideas?

You can always switch to OpenDNS. Most people's primary DNS is actually their wireless router or ISP. Both of which are often old, flaky versions that aren't working right.

DNS Lookup fail

I have a 20inch iMac that I connect wirelessly in my home network. I never had any problems with the wireless connection until a few months ago.
For the past few months, DNS lookups have been failing when browsing the web. I see "looking up cnn.com" as an example in the status bar. I have to wait for it to fail and then hit reload and then the page will load. Sometimes, certain parts of the page will not load if it has to do a lookup to a new domain e.g. images.cnn.com.
I have several other computers on my network [notebooks wired and wireless as well as wired pcs] with no issues.
Today, I moved my iMac to my office where my router is and plugged it in via an ethernet cable. Looks like there are no issues and I can browse any site without any lookup failures.
I have read a lot of posts about slow wifi, so I'm not sure if this is related. Anyone else have a similar issue? Looks like I'm going to have to run a cable to my kitchen since the wireless is just too flaky.

HI--
I guess it's better, but not 100% fixed.
If you're using a router, I'd suggest putting your router's address into the DNS field in your TCP/IP settings. I've found, especially when running an Airport base station behind my Netgear router, that helps out quite a bit. In my case, I couldn't get get internet access from my wireless laptop without that.
I didn't try the 4.xxxx DNS suggestion. No offense,
but that sounds really hokey.
No, Eric's right, that's a great way to get around poor ISP DNS performance. I use those servers when my ISP has trouble keeping their DNS servers running.
Also, you can time different servers if you want, using the dig utility in the Terminal application:
<pre class="command">dig [email protected]</pre>You should get the query time near the bottom of the output. There are lists of publicly accessible DNS servers on the internet. Run some time tests and see if you can find some faster ones. Here's what I got:
<pre class="command">; <<>> DiG 9.3.2 <<>> [email protected]
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 12531
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;www.apple.com\@4.2.2.1. IN A
;; AUTHORITY SECTION:
. 900 IN SOA A.ROOT-SERVERS.NET. NSTLD.VERISIGN-GRS.COM. 2006120100 1800 900 604800 86400
;; Query time: 37 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Fri Dec 1 17:05:21 2006
;; MSG SIZE rcvd: 114</pre>
charlie

Any idea how to fix my flaky internet?

To be more detailed, my AirPort Extreme needs to be extended by an AirPort Express, which then is extended to my personal Time Capsule. The internet drops on my MacBook Pro and other MacBook Pros randomly. We then reconnect with no problem and go on with what we were doing. The internet is fine. Always able to connect. We have Open DNS set up as well. But the flaky internet is annoying. It was fine before this started happening.
Any ideas how to fix this?

By mistake I clicked cannot connect to Youtube in Tags. Youtube works fine.

Flaky imac to timecapsule wifi but printer OK

We have a new (purchased Sept 22) iMac and time capsule. The wifi connection
between the iMac and the TC (which is our router as well connected to a cable
modem) is flaky. A Linux machine connected to the TC by ethernet always connects
to the internet just fine, and can print to a wifi printer via the TC just fine,
but often the iMac seems to "connect" to the TC, but nothing really happens --
mail times out, browsers time out or run extremely slowly. Sometimes this can be
fixed by turning airport off on the iMac and then back on. Today it was really
bad, and Airport Utility couldn't even find any wireless devices, even with
reboots of the iMac and the TC. So I connected an ethernet cable for the iMac,
even though I prefer the wifi, and suddenly both connections are up (ethernet
and wifi). This is extremely frustrating. Any help will be greatly appreciated.
I did find something funny in the Time Capsule log of this mornings weirdness:
there were two 'associateds' for the iMac, and then a constant series of
attempts to associate that were deauthenticated after a couple of seconds:
Oct 30 10:02:33 Severity:5 Initialized (firmware 7.3.2).
Oct 30 10:02:35 Severity:5 (WAN) link state is Up.
Oct 30 10:02:35 Severity:3 No Address for NTP server time.apple.com.
Oct 30 10:02:35 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 3).
Oct 30 10:02:35 Severity:5 Rotated TKIP group key.
Oct 30 10:02:39 Severity:5 Internet Configuration leased -- host <75.118.6.202/255.255.252.0> gateway <75.118.4.1> dns <64.233.222.2 64.233.222.7> wins lease <604800> domain <wowway.com>
Oct 30 10:02:46 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:02:47 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:02:48 Severity:5 Deauthenticating with station 00:21:e9:e4:a5:5c (reserved 2).
Oct 30 10:02:48 Severity:5 Disassociated with station 00:21:e9:e4:a5:5c
Oct 30 10:02:51 Severity:5 Clock synchronized to network time server time.apple.com (adjusted +4 seconds).
Oct 30 10:02:57 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:01 Severity:5 Deauthenticating with station 00:21:e9:e4:a5:5c (reserved 2).
Oct 30 10:03:01 Severity:5 Disassociated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:12 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:15 Severity:5 Deauthenticating with station 00:21:e9:e4:a5:5c (reserved 2).
Oct 30 10:03:15 Severity:5 Disassociated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:19 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:22 Severity:5 Deauthenticating with station 00:21:e9:e4:a5:5c (reserved 2).
Oct 30 10:03:22 Severity:5 Disassociated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:26 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:29 Severity:5 Deauthenticating with station 00:21:e9:e4:a5:5c (reserved 2).
Oct 30 10:03:29 Severity:5 Disassociated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:34 Severity:5 Associated with station 00:21:e9:e4:a5:5c
Oct 30 10:03:37 Severity:5 Deauthenticating with station 00:21:e9:e4:a5:5c (reserved 2).

b3nbranch,
Welcome to the Apple Discussions!
*_Time Capsule Weak Signal Strength / Dropped Connections_*
Forgive the size of the post, but the suggestions below have helped others with similar issues. Try each topic individually and see if things improve, If not move on to the next one.
*Keep the Time Capsule Cool*
Some posters have observed that when they positioned the Time Capsule for better ventilation and cooling, their network connectivity issues resolved themselves. Also avoid locating the devise within poorly ventilated cabinets or piling items around or on top of it.
*Time Capsule Orientation*
While the location you chose to setup your Time Capsule may be acceptable, but the direction it is oriented can have an effect on signal strength. It appears that the signal of the Time Capsule does not radiate equally from all sides of the devise.
The antennas within the devise are positioned along the 3 smooth sides. That is, there is no antenna on the side bearing the ports and cables. As a result, position the devise with the ports and cables AWAY from the direction of most of the clients that will be connecting to it.
*Cordless Phones*
Some users have discovered that the cordless phones they have in the home occupy or are near the same bandwidth as their wireless network (2.4Ghz or 5Ghz). Try temporarily disabling the handsets and their bases and see if network connectivity improves. If so you may need to change the channel that the phone uses or purchase phones that occupy a different bandwidth.
*Proximity To Other Devices*
One poster observed: “Finally have full access, full speed, and full functionality. Initially I installed the Time Capsule at the location of my cable, cable modem... which of course was next to my HDTV, DVD, Apple TV, Amplifier, etc. Get the picture? After about 4 weeks of starts and stops, resets and repeated initial backups, I moved the unit to another location, closer to my Mac, and in an area where there are no other electronics. Now, it runs perfect.” [http://discussions.apple.com/thread.jspa?threadID=1734818&tstart=0]
*Change Firewall Settings* #
Go to System Preferences --> Security.
Click the Firewall tab.
Change setting to “Set access for specific services and applications”.
The System will now ask you when each process wants to penetrate the firewall. Once you click “Allow” each time you are asked, it will be saved in the pane at the bottom of this window and it should never ask you again.
One poster observed, “Since I made this change, my wireless has been strong and Time Machine works like a champ and the impact on my network performance is minimal. I speculate that the change in performance is due to security protocols or services that run in the 'allow all incoming connections' and 'allow only essential services' modes. Whatever the reason this fix has worked for me for over 2 months without resetting my airport connection or time capsule.” [http://discussions.apple.com/thread.jspa?messageID=8348496#8348496]
*Change Time Capsules’ Channel*
Launch Airport Utility.
Select the device on the left.
Click "Manual Setup."
Select “Airport” in the toolbar.
Click the "Wireless" tab.
If “Channel” is set to “Automatic” try changing to a different one. Holding the Option key down and clicking the drop-down menu should provide more channels to choose from. If you have another wireless router operating, ensure that each devices’ channels are as far apart as possible.
Click “Update”.
Close Airport Utility.
*Preferred Networks & Airport Services*
You may be experiencing interference from other networks in your neighborhood. When you click the Airport menu are there other networks listed other than your own?
If so, is your network at the top of the list? It should be.
Go to System Preferences --> Network --> Select Airport on the left.
Click "Advanced". In the “Airport” tab note the various local wireless networks that Airport detects. Is the network you prefer to connect to at the top of the list? If not drag it to the top. Are there other networks you never intend to connect to (an old work network, or a neighbors network)? Then highlight them and click the "-" button.
Make sure “Remember any network this computer has joined” is checked.
Click "OK".
For "Network Name" be sure your network is selected and then click "Apply".
Is Airport (wireless) your primary means of connecting to your network? If so, is Airport at the top of the list of services on the left? It should be.
Click the small “Gear” button at the bottom of the window and select “Set Service Order”.
Now drag Airport to the top of the list.
Click “OK”. Click “Apply”.
Now see if network connectivity has improved.
*Transmit Power & Wide Channels*
If you are using the 802.11n only (5GHz) radio mode, you can also select to use wide channels, which provide higher data throughput in your network.
Launch Airport Utility
Select your Time Capsule on the left.
Click “Manual Setup”.
Select “Airport” in the toolbar.
Click the “Wireless” tab.
Click “Wireless Options...” at the bottom of the window.
Adjust the “Transmit Power” to 100%.
Put a check mark in the box labeled “Use Wide Channels”. (If you are using a 802.11a/b/g (2.4GHz) radio mode then select “Interference Robustness”)
Click “Done”.
Click “Update” in the lower right hand corner.
Wait for the Time Capsule to restart and then see if your network speeds improve.
Let us know if any of the above helped improve your situation.
Cheers!

Errors.current: Tousends of "..Received an invalid DNS.

In our file "errors.current", we have many tousends of such entries:
Fri Feb 1 13:24:49 2008 Warning: Received an invalid DNS Response: rcode=ServFail data="'\\x8e\\x85\\x81\\x82\\x00\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x0edrillerssupply\\x03com\\x00\\x00\\x0f\\x00\\x01'" to IP 10.168.3.24 looking up drillerssupply.com
What's about the above IP 10.168.3.24?
(Is this IP sending or receving a mail? Whats the meaning of this IP?)
Nearly all entries occures in combination with only 3 IPs. None of this IP is a mailserver or ironport.
What exactly can I do to minimize or prevent such entries?

This indicates that DNS server 10.168.3.24 returned a 'servfail' when it attempted to lookup domain 'drillerssupply.com' in DNS. SERVFAIL means that the domain does exist and the root name servers have information on this domain, but that the authoritative name servers are not answering queries for this domain.
I got a 'servfail' response when i attempted to lookup this domain from my workstation.
bash-3.00# dig MX drillerssupply.com
; <<>> DiG 9.2.4 <>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 7332
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;drillerssupply.com. IN MX
;; Query time: 178 msec
;; SERVER: 172.17.128.3#53(172.17.128.3)
;; WHEN: Mon Feb 4 16:52:10 2008
;; MSG SIZE rcvd: 36
Seeing lots of these messages in the logs indicates that there are lots of emails going to sites that have garbaged DNS replies. It would also mean that the local DNS server is flaky. Based upon this particular example, i would lean on the former.

Open DNS follow-up report

Interestingly, after a very positive experience by adding the open DNS numbers 208.67.222.222 and 208.67.220.220, I found today that every time I tried to open Safari it knocked me offline. So I've now resorted back to the number originally assigned to me.
What's going on with Safari?

Jake,
One Verizon DSL account; one Westell 6100 modem
Check with Verizon and find out what the max download / upload speeds should be.
If this is the plan you purchased: http://www22.verizon.com/residential/highspeedinternet/
*"And we’re constantly looking for ways to make our DSL faster—recently upgrading our Starter plan to 1 Mbps* download and our Turbo plan to 7.1 Mbps."*
1 Mbps download / 7.1 Mbps is hardly high speed.
You can check your upload/download speeds here. http://www.speedtest.net/
To realize faster download and uploads speeds you would need to upgrade your service.
This is more then just a DNS issue.

Problem with DNS and/or Virtual Host (works from inside, not from outside)

I am running several web sites (as virtual hosts) successfully on one Xserve (192.168.200), which are accessible internally and from the Internet (via forwarding port 80 on our firewall).
Now I am trying to add another web site (newmini.domain.com), which however is running on a Mac mini (also on the same subnet as the Xserve) at 192.168.100. What I did is make an additional entry under the Xserve's DNS for the domain (domain.com) (+ Machine..., pointing to 192.168.0.100). (I also made the necessary changes to the Mac mini's httpd and hosts configuration--no problem there).
Now, here's the strange thing: All computers on the subnet, whose DNS points to the Xserve, can see and browse newmini.domain.com fine. No problem. The computers ask the Xserve for the IP of the host in question, the Xserve says, "192.168.100", the request goes to the Mac mini, and it serves the web site as expected.
But this doesn't happen if the request comes from the Internet. Instead of seeing the Mac mini, the client sees the default web site of the Xserve... So it appears that somewhere, the virtual host part of the HTTP request is lost between our firewall and the Xserve.
Any ideas? Thanks.

It's not going to.
You say you've setup port forwarding on the firewall. Port forwarding only cares about the port number (80). It knows nothing about the nature of the request (e.g. the hostname that the web request is for). Therefore all extenal connections on port 80 get sent to the XServe. The newmini doesn't see the traffic at all.
If you only have a single public IP address you can only forward port 80 traffic to a single machine. Your options are to either use a different port number, or configure the XServe to proxy the connection to the mini (so now the traffic goes router -> XServe -> Mini -> XServe -> router), although that might not do what you want since it still places load and dependencies on the XServe.

Open DNS

My very much up-to-date Safari has been exceptionally neurotic. The day begins at lightning speed, then slows down, then, from time to time, Safari simply knocks out my internet connection.
I've seen others here suggesting one could add 208.67.222.222 and 208.67.220.220 in their DNS menu. I haven't done it yet, simply when I click "+" to do so, my current numbers disappear. I was hoping the two series of numbers above could be added rather than substituted, so that if there was a problem with the two suggested numbers, I could revert back to the old ones, provided by, I assume, my internet provider Verizon.
Any thoughts on the above?

How did you add them?
If you are using a single computer: Open System Preferences/Network. Double click on your connection type, or select it in the drop-down menu, and in the box marked 'DNS Servers' add the following two numbers:
208.67.222.222
208.67.220.220
(You can also enter them if you click on Advanced and then DNS)
Sometimes reversing the order of the DNS numbers can be beneficial in cases where there is a long delay before web pages start to load, and then suddenly load at normal speed:
http://support.apple.com/kb/TS2296
If your computer is part of a network: please refer to this page: http://www.opendns.com/start/bestpractices/#yournetwork and follow the advice given.
(An explanation of why using Open DNS is both safe and a good idea can be read here: http://www.labnol.org/internet/tools/opendsn-what-is-opendns-why-required-2/2587 /
Open DNS also provides an anti-phishing feature: http://www.opendns.com/solutions/homenetwork/anti-phishing/ )
Wikipedia also has an interesting article about Open DNS:
http://en.wikipedia.org/wiki/OpenDNS

Open DNS and internet sharing

I am seeing strange behavior, and wondering if anyone has a thought about what is going on.
I am at a hotel with fast internet service over ethernet, but, for whatever reason, DNS seems very slow if I use DHCP to connect (timeouts of 5-10 secs to get to a new site). If I switch to DHCP with fixed DNS, and use the Open DNS servers (208.67.222.222, 208.67.220.220) the latency issues go away.
The interesting thing is that I am sharing the internet connection over Airport to my wife's computer (she connecting thru DHCP). If I use a fixed DNS for MY computer, then her computer cannot connect thru internet sharing. But if I use the (slow) DHCP connection, then she can connect through mine. I have not tried setting up her computer with a fixed DNS, as she really doesn't like me to change settings on her computer
Is this a known limitation of internet sharing, or is there something I should know?
TIA

In more detail, if my ethernet (the computer that is doing the sharing), is set up with Configure: Using DHCP, and DNS Server: 208.67.222.222, 208.67.220.220 (in Network Panel for Ethernet), then the computer connecting thru Internet Sharing in Sharing Panel is not able to access some or all resources thru http (ie, pages fail to load, or do not fully load).
However, if I clear the DNS Server part in the Network Panel, thereby using the the DNS Servers supplied by the hotel, then my computer's connection to the internet is slower, with long waits (presumably due to a slow DNS server), but computers accessing the internet via Airport thru my shared connection are able to browse the internet successfully.
I suspect that when I have a fixed DNS server in my computer, that fact is not broadcast to computers using the shared connection. But I am not an expert in TCP/IP, and may well be confused about how DHCP, DNS, and Apple's Internet Sharing work together.
Thanks for any ideas you have
A

Open DNS & Airport Question

I have a wireless network (Airport Extreme and Airport Express for range in the back of my house). Have 4 Macs on the network. All have Open DNS set in System Prefs>Network>Airport>Advanced>DNS.
Should I set one or both of the Airports to Open DNS also? If so, how? I looked at Airport Utility and see no ready way to do it.
If I should add OPen DNS to Airport, can someone tell me how in an easy to follow fashion?
Thanks in advance!

No, sorry.
All my machines are individually set for Open DNS: System Prefs>Network>Airport>Advanced>DNS: 208.67.222.222; 208.67.220.220.
The machines have been set this way for a long time.
My Q: Can/Should I set my Airports (Express and Extreme) somehow for Open DNS?
My general configuration is:Cable>Modem>Airport>4 Macs.
The hardware configuration is Cable into Router (Cox), Ethernet into Extreme, broadcast to Express 5 rooms away (to serve 2 of the 4 Macs); Ch 1 all.
Perfect connection - so don't want to mess with that.
Just want to know (if I can to speed up download time) --
Would (if possible) setting the Airport settings to Open DNS help my speed? If so, how in the world would one do that - - > set the actual base station to have Open DNS settings?
Make sense? Hope so!
Thanks!
Message was edited by: pcbjr

Follow up - DNS (internal domain has same name as external website)

Hi,
I am following up with on previous blog entry about resolving an domain internal name to an external website found here:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/4d97325b-ff3a-4f46-ba6e-dc3f4ff978e1/dns-internal-domain-has-same-name-as-external-website
On October 30, 2014
HayashiTech provided a response suggesting the use of netsh interface portproxy on the DC's to resolve this issue. There has been no feedback to this suggestion and I am very curious what opinions are out there for this suggestion as it appears to be the
best option provided yet.
Thank you in advance as well for all the great guidance I have found provided by Ace and his followers.

Interesting question. I've not seen that solution before, but having done a test on my lab setup it certainly seems to work as expected. Eg, using :
netsh interface portproxy add v4tov4 listenport=80 listenaddress=dc1.abc.com connectport=80 connectaddress=www.abc.com
on my DC where I've setup a working external domain name with the www record pointing to the website, and the non-www record pointing to the DC, requests to the non-www address are successfully being redirected to the www address (after confirming it didn't
happen prior to adding the portproxy).
So on the face of it that does look like a workable solution. I haven't used it myself in anger obviously, but the two downsides I can think of immediately to this solution are :
1) This operates as a proxy, so unlike the IIS method that Ace mentioned where it would tell the client to go to the www address instead (so the client connects direct), this method keeps your DC acting as a middle man, eg all communications to that address
go through your DC rather than direct from the client to the website. Depending on what they're doing on the website this may or may not be an issue for you.
2) Since the client is continuing to connect to the DC throughout, if you ever did need the have something on the DC responding to port 80 then you could have issues. That said, according to
https://technet.microsoft.com/en-us/library/cc731068(v=ws.10).aspx the portproxy listenaddress can be a FQDN rather than IP, so that could mitigate any issues there.

Having trouble setting up Open DNS with mac.

When I try to set up Open DNS I get the following error message:
Safari can’t open the page “http://192.168.1.1/Basic.tri” because the server unexpectedly dropped the connection. This sometimes occurs when the server is busy. Wait for a few minutes, and then try again.
I have a Linksys router. I can get the router so save the settings using my Microsoft laptop, but I get an "oops" error message from Open DNS saying I am not set up on their site and just sends me back to step one. Does this sound familiar to anyone?

No, you cannot put the router in front of the modem.
You might look for any information your ISP gave you for your modem, such as a user guide. Or use the instructions at OpenDNS for a Motorola router, it should be similar. Remove the router and directly connect just one computer to the modem and try to access the modem's built in utility, as you have with your Linksys router. Motorola's default address appears to be "http://192.168.10.1/", the default username is "admin", and the password "password". If you encounter a question about obtaining the DNS service dynamically, check NO, then handset the OpenDNS servers, save and possibly restart the modem.
If you are successful in configuring the modem, go back to the router and leave the DNS settings blank, as well as on each computer. Then the computers should receive the service dynamically from the modem.
After all that, hopefully the OpenDNS website detects you using their service and allows you to proceed with setting up your account.
Dah•veed

DNS Flakiness

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