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DNS not working for a C-Name record

I have set up DNS records to point to a url of a cloud server.

So I have myurl.mycompany.com pointing to xxx.amazoncloud.com on the c-name section of my DNS zone files. The prolem is on some DNS server this is not seen.

I'm in Ireland and the DNS server I use from my provider can ping the xxx.amazoncloud.com , that's straight to the server, but it can't ping the myurl.mycompany.com

Any ideas?

Miguel Angel Perez Muñoz

How are you doing this test? Is possible DNS query is cached and your query has an old value. Try using Nslookup: http://technet.microsoft.com/en-us/library/aa997324(EXCHG.65).aspx

David Atkin

Hello,

I would try re-applying the DNS Settings in your DNS Zone Files for the C-Name. I've had occasions before where they have not applied for whatever reason.

Who is your domain provider?

Also, if you have a server on site then internal DNS made need changing depending on your existing setup.

wannabecraig

ASKER

nslookup can't find it either.
I called the provider and they can not resolve it their site either.
Out other provider can, (we use the one I'm having a problem with as a backup)

We have our DNZ zone files with Network Solutions.
When we are using the backup it's down't use our internal DNS at all.

Jan Bacher

If you would provide the fully qualified domain name, it would be a lot easier to tell you what is or is not working.

xDUCKx

When did you create the CNAME? DNS can take up to 48 hours to propagate worldwide.

wannabecraig

ASKER

f.live.emusetech.com

Records are up there a few months now.

Jan Bacher

I see the cname record.

f.live.emusetech.com. 7200 IN CNAME verizonlb-234282631.us-east-1.elb.amazonaws.com.
verizonlb-234282631.us-east-1.elb.amazonaws.com. 60 IN A 107.21.247.43

wannabecraig

ASKER

HI,

YEah, I can see it too and I can see it on some DNS servers, but not our provider.

Jan Bacher

So, when you do a dig against your provider's DNS servers, you are not seeing that record?

wannabecraig

ASKER

I'm on their connection and when I do an nslookup not records are returned.

Jan Bacher

download dig and use it:

dig f.live.emusetech.com @IP_of_your_provider +trace

and show the results.

David Atkin

Check with your provider to see when their DNS servers update.

wannabecraig

ASKER

^^

I'm sure they update more than every 3 months no?

wannabecraig

ASKER

IS this the dig tool you're talking about?
http://members.shaw.ca/nicholas.fong/dig/

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Jan Bacher

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David Atkin

Sorry I missed that post.

It will be interesting to see the dig results.

wannabecraig

ASKER

This is the output:

C:\dig>dig f.live.emusetech.com @159.134.0.1 +trace

; <<>> DiG 9.3.2 <<>> f.live.emusetech.com @159.134.0.1 +trace
; (1 server found)
;; global options: printcmd
. 262593 IN NS l.root-servers.net.
. 400659 IN NS k.root-servers.net.
. 400659 IN NS i.root-servers.net.
. 400659 IN NS g.root-servers.net.
. 400659 IN NS h.root-servers.net.
. 400659 IN NS e.root-servers.net.
. 400659 IN NS b.root-servers.net.
. 400659 IN NS c.root-servers.net.
. 400659 IN NS a.root-servers.net.
. 400659 IN NS d.root-servers.net.
. 400659 IN NS f.root-servers.net.
. 400659 IN NS j.root-servers.net.
. 400659 IN NS m.root-servers.net.
;; Received 228 bytes from 159.134.0.1#53(159.134.0.1) in 309 ms

com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
;; Received 498 bytes from 199.7.83.42#53(l.root-servers.net) in 85 ms

emusetech.com. 172800 IN NS ns35.worldnic.com.
emusetech.com. 172800 IN NS ns36.worldnic.com.
;; Received 117 bytes from 192.5.6.30#53(a.gtld-servers.net) in 176 ms

;; Warning: Message parser reports malformed message packet.
;; Truncated, retrying in TCP mode.
f.live.emusetech.com. 7200 IN CNAME verizonlb-234282631.us-east-1.el
b.amazonaws.com.
. 518400 IN NS a.root-servers.net.
. 518400 IN NS b.root-servers.net.
. 518400 IN NS c.root-servers.net.
. 518400 IN NS d.root-servers.net.
. 518400 IN NS e.root-servers.net.
. 518400 IN NS f.root-servers.net.
. 518400 IN NS g.root-servers.net.
. 518400 IN NS h.root-servers.net.
. 518400 IN NS i.root-servers.net.
. 518400 IN NS j.root-servers.net.
. 518400 IN NS k.root-servers.net.
. 518400 IN NS l.root-servers.net.
. 518400 IN NS m.root-servers.net.
;; Received 515 bytes from 205.178.190.18#53(ns35.worldnic.com) in 482 ms

Jan Bacher

Is your provider blocking TCP port 53?

wannabecraig

ASKER

Not sure. Some extra info is that if I change my local DNS settings on my PC to google's DNS server it works fine. Not sure if that changes things.

Leon Fester

Do you have a split dns zone?

If mycompany.com is also an internal zone then you won't use the external DNS servers for finding any other records. You will need to add the record to the internal zone for name resolution to work.

When you use the External DNS servers from google, you're bypassing the internal DNS servers.

wannabecraig

ASKER

Hi, not, there is no split zone. We use this domain name only for our external servers and there is no access to our internal DNS server from this router.