Web Mail Not Working After Adding New DNS Zone

[alex.olynyk]

@Dashrender so a split horizon DNS would be creating a zone for roseradiology.com and then adding internal records for mail, www, etc

Our new active directory domain is rose.internal so would that be the top level domain?

[Kelly]

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

[Dashrender]

@alex.olynyk said in Web Mail Not Working After Adding New DNS Zone:

@Dashrender so a split horizon DNS would be creating a zone for roseradiology.com and then adding internal records for mail, www, etc

Our new active directory domain is rose.internal so would that be the top level domain?

Correct, rose.internal is your internal TLD. But .internal does not exist on the internet, so you asked about registering it, you can't register is for use on the internet. Think of it like the 10.x.x.x network. You can use that internally, but not on the internet. You can have any TLD internally that you want, but when it comes to what is used on the internet, you have to follow the ICANN rules.

[Dashrender]

@Kelly said in Web Mail Not Working After Adding New DNS Zone:

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

Is of course is the best solution when using Split Horizon DNS because if the internal IP changes, the records will all follow.

[alex.olynyk]

so whoever hosts the DNS for my domain should be able to create a CNAME to alias owncloud.roseradiology.com to owncloud.rose.internal? Correct?

[Dashrender]

@alex.olynyk said in Web Mail Not Working After Adding New DNS Zone:

so whoever hosts the DNS for my domain should be able to create a CNAME to alias owncloud.roseradiology.com to owncloud.rose.internal? Correct?

No, that is something you would do internally, on the DNS servers you control. In a Split Horizon setup, the two systems, internal DNS and external DNS, they both are handled completely separately.

But, internally, where you have both rose.internal and roseradiology.com, you can create a record from one domain pointing to the other if you want.

[scottalanmiller]

@alex.olynyk said in Web Mail Not Working After Adding New DNS Zone:

So if I add a record for mail.roseradiology.com that should fix?

Yes, but it's far from ideal.

[scottalanmiller]

@alex.olynyk said in Web Mail Not Working After Adding New DNS Zone:

so whoever hosts the DNS for my domain should be able to create a CNAME to alias owncloud.roseradiology.com to owncloud.rose.internal? Correct?

but that would direct ALL external users to the same internal IP address causing them to fail.

[dafyre]

@scottalanmiller said in Web Mail Not Working After Adding New DNS Zone:

@alex.olynyk said in Web Mail Not Working After Adding New DNS Zone:

so whoever hosts the DNS for my domain should be able to create a CNAME to alias owncloud.roseradiology.com to owncloud.rose.internal? Correct?

but that would direct ALL external users to the same internal IP address causing them to fail.

he's talking about doing this on his INTERNAL DNS server, I do believe.

[scottalanmiller]

people don't normally refers to the internal staff as "whoever hosts my..." That's an odd terminology to use for the guy at the desk next to yours.

[Dashrender]

@scottalanmiller said in Web Mail Not Working After Adding New DNS Zone:

people don't normally refers to the internal staff as "whoever hosts my..." That's an odd terminology to use for the guy at the desk next to yours.

Or your own desk.

[JaredBusch]

@scottalanmiller said in Web Mail Not Working After Adding New DNS Zone:

people don't normally refers to the internal staff as "whoever hosts my..." That's an odd terminology to use for the guy at the desk next to yours.

Yes, but if you recall (or go look at) the prior thread, it is clear that he has no understanding of DNS at all.

[JaredBusch]

@Kelly said in Web Mail Not Working After Adding New DNS Zone:

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

I did not think Windows let you do that

[JaredBusch]

For you internal DNS server, you have to now setup everything to match what your external DNS shows, except for the items that you want to point to internal addresses.

Here is a live working example from a client

Internal DNS for domain.com

External DNS for domain.com

[Dashrender]

@JaredBusch said in Web Mail Not Working After Adding New DNS Zone:

@Kelly said in Web Mail Not Working After Adding New DNS Zone:

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

I did not think Windows let you do that

You absolutely can do this.

[JaredBusch]

@Dashrender said in Web Mail Not Working After Adding New DNS Zone:

@JaredBusch said in Web Mail Not Working After Adding New DNS Zone:

@Kelly said in Web Mail Not Working After Adding New DNS Zone:

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

I did not think Windows let you do that

You absolutely can do this.

Of course you can add a CNAME to an existing zone. I thought @Kelly was saying to add a CNAME for owncloud.roseradiology.com without adding roseradiology.com as a forward lookup zone.

That was what I thought you could not do.

[Dashrender]

@JaredBusch said in Web Mail Not Working After Adding New DNS Zone:

@Dashrender said in Web Mail Not Working After Adding New DNS Zone:

@JaredBusch said in Web Mail Not Working After Adding New DNS Zone:

@Kelly said in Web Mail Not Working After Adding New DNS Zone:

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

I did not think Windows let you do that

You absolutely can do this.

Of course you can add a CNAME to an existing zone. I thought @Kelly was saying to add a CNAME for owncloud.roseradiology.com without adding roseradiology.com as a forward lookup zone.

That was what I thought you could not do.

huh, yeah I would guess you couldn't do that either, again, if you're not hosting the zone you want to Cname to, you can't do it.

[JaredBusch]

@Dashrender said in Web Mail Not Working After Adding New DNS Zone:

@JaredBusch said in Web Mail Not Working After Adding New DNS Zone:

@Dashrender said in Web Mail Not Working After Adding New DNS Zone:

@JaredBusch said in Web Mail Not Working After Adding New DNS Zone:

@Kelly said in Web Mail Not Working After Adding New DNS Zone:

What about creating a CNAME that points to the internal A record?

For example:

A 192.168.1.5 ownlcloud.rose.internal
CNAME owncloud.roseradiology.com owncloud.rose.internal

I did not think Windows let you do that

You absolutely can do this.

Of course you can add a CNAME to an existing zone. I thought @Kelly was saying to add a CNAME for owncloud.roseradiology.com without adding roseradiology.com as a forward lookup zone.

That was what I thought you could not do.

huh, yeah I would guess you couldn't do that either, again, if you're not hosting the zone you want to Cname to, you can't do it.

Interestingly enough, it lets you add it, but it does not work.

owncloud.domain.local resolves to 10.201.1.17

[Dashrender]

Of course it doesn't work - the system isn't authoritative for the daerma.com domain, so it wouldn't even look for that entry.

What would be interesting though is the opposite, junk.xxxxxx.local -> oc.daerma.com

Which should work.

[alex.olynyk]

Cname did the trick. Thanks everyone.