BT Hub 5A DNS server issues

For the last week or so the hub will not resolve any web addresses using the default BT DNS servers. It's fine during the day but is a problem in the evenings. I can get around it by setting individual PCs to use 8.8.8.8 as the DNS server, but because you cannot change the address of the DNS servers in the hub itself it means resetting each connected device.
Sometimes the BT DNS servers will respond after a long wait, but they usually time-out. The next morning the BT DNS servers will be available again. My hub updated to the latest firmware last month, the -204 version and appears to have downloaded the recent patch update a day ago, although I don't know if it has fully installed it. Is there any way to tell by looking at the TR069 parameters in the hub logs?
I've had the odd problems with the BT DNS servers in the past but nothing like the last week, it's almost like someone turns them off after 5pm! Whilst the Google DNS servers provide a work-around, it's not a long term solution. Is anyone else having the same problem or know of a fix? I've done the usual resets etc, but don't want the speed to start dropping by doing any further resets. FYI the line stats are all OK.
Thanks in advance.

I suggest you try a factory reset of the hub
http://bt.custhelp.com/app/answers/detail/a_id/11386/~/how-do-i-reset-my-bt-home-hub-to-its-factory-...
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Should I move one of these Airport Extreme wifi routers to before the switch, and have the other 2 in Bridge mode after the switch? Do I need to setup a specific range of DHCP reservation addresses for each different AE router?
Appreciate any insight anyone can share with this aggravating DNS server issue between Comcast & multiple Airport Extreme wifi routers.

I do not see anything wrong with your basic setup.. the issue is indeed the WAN ports of the AE.. AC version are having problems with some network equipment.
You have listed a stack of things you have tried.. but I want you to move the ethernet patch cable you use on each AE to its LAN port instead of WAN.
Restart the airport when you do that.. and then see if it becomes stable.
In bridge mode the airport moves the WAN port to LAN.. but the WAN port setup itself seems more problematic than the LAN ports.
There are other methods we can try if this does not work.. but in the end.. I would be tempted to take the whole lot back to apple.. they need to start making equipment that works with standard modems and switches.
BTW what brand is the 16 port switch?? Does it happen to be managed (smart type)?

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Thanks for your reply.
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lycoscoot,
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AdaS_VZW
Follow us on Twitter at @VZWSupport

Internal DNS server and NAT routing issue.

Hi -- I am not terribly experienced with DNS and I am running into an issue that I can't seem to resolve. My company.com DNS information is hosted by an outside ISP for email, web, etc... but I have configured an A record there to point to the public IP to my mac os x server (server.company.com).
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The problem is that I would like to be able to access some services simply via "server.company.com" both inside and outside the private network. Now, accessing the "server.company.com" services from the private lan does not work because the name resolves to the external IP and the external IP cannot be used internally due to NAT.
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Thanks

Is there a way to configure my internal DNS server to respond with the appropriate private address when receiving a query only to "server.company.com" and forward requests on for anything else on "company.com"?
Ordinarily, no. Once your server thinks it is responsible for a zone (e.g. company.com) then it will answer all queries for that domain and never pass them upstream. Therefore you'd have to replicate all the zone data, including all the public records, and maintain them both.
The one possible exception to this (I haven't tried) is to create a zone for server.company.com that has your internal address. In theory (like I said, I haven't tried this), the server should respond to 'server.company.com' lookups with its own zone data and defer all other lookups (including other company.com names since they're not in a zone it controls). Might be worth trying.

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You must have a working DNS service, and the server's hostname must match its fully-qualified domain name. To confirm, select the server by name in the sidebar of the Server application window, then select the Overview tab. Click the Edit button on the Host Name line. On the Accessing your Server sheet, Domain Name should be selected. Change the Host Name, if necessary. The server must have at least a three-level name (e.g. "server.yourdomain.com"), and the name must not be in the ".local" top-level domain, which is reserved for Bonjour.
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But this will be a problem for my ipad and iphone that uses wifi.
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When trying to create or update Azure RemoteApp collections that use a template image for some non-EN-US locales, it might fail with error "DNS server could not be reached". You might also see error code "DnsNotReachable".

Cause: There was a issue in Azure in which decimal punctuation was not treated properly if the locale of the template image used a comma (,) instead of a period (.).
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Hi all,
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Hi Constantinos,
Have you taken a look at the infoblox community site? We've just reposted your question there and alerted some internal SMEs that should provide a solution soon.
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Screenshots:
http://www.flickr.com/photos/random_robin/5310011344/
http://www.flickr.com/photos/random_robin/5310016288/
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After 16 hours of working i don´t have seen this easy solution. I had tried with Internet Explorer and Opera but finaly i have need to use Firefox.
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my client is running a windows 2008 r2 server with dns and dhcp roles. it's not a domain controller, just a workgoup server.
got a notification from my client's isp:
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amplification attacks. AT&T has detected these attacks and has confirmed
that the IP address x.x.x.x allocated to your Internet access account is
accessible from the Internet as an open DNS resolver. "
tried disabling recursion, but then there is no access to the internet.
tried disabling the firewall rule for dns udp, and no access to the internet.
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Just to add, I was wondering why you had port 53 opened to your DNS servers. And just to point out, that rule you created is a port translation rule that allows access to your DNS server from the internet, just as if you had created a rule to allow access
to an internal web server for public use, or for allowing webmail (OWA) access from the internet to your internal mail server.
What you did, as Keith said, will stop that, but to further point out, the rules are not really needed again, I would just remove the rules completely. For internet access, such as allowing your users to access websites, your DNS to resolve external names
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The only time you want to create rules is either you want to allow inbound traffic with a port translation rule (such as what you originally unknowingly did for TCP & UDP 53) to a web server, OWA, SMTP traffic to a mail server, etc.), otherwise,
leave it out of the box.
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the following threads, with ways to stop or mitigate them.
Best way to reduce or disable DNS amplification for external DNS?,
Sunday, June 16, 2013 6:08 PM
http://social.technet.microsoft.com/Forums/windowsserver/en-US/d087a768-2075-49e4-afec-4fd23b50af0a/best-way-to-reduce-or-disable-dns-amplification-for-external-dns
Protecting Windows DNS Server from being abused for DNS amplification attacks,
Wednesday, April 10, 2013 8:05 AM
http://social.technet.microsoft.com/Forums/windowsserver/en-US/fac86dc7-779d-48eb-a113-9c06c2222af9/protecting-windows-dns-server-from-being-abused-for-dns-amplification-attacks
Ace Fekay
MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/
This post is provided AS-IS with no warranties or guarantees and confers no rights.

Strange issues with domain controller/DNS server

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When I accessed the server directly through the console I could access everything, could connect to any machine in the office, nothing seemed to be wrong with it.
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Is there any recent changes in your network or firewall or antivirus? Is there any change/updates performed in the AD side? I would suggest find out changes being done at the AD or Network/FIrewall level. You can run various diagnostic test within your AD
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My Blog: awinish.wordpress.com
Disclaimer This posting is provided AS-IS with no warranties/guarantees and confers no rights.

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