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Problems with using a non-reserved top-level domain for local DNS resolution

A network administrator at my organization (let’s call him "Bill") wants to configure an internal DNS with the live top-level domain (TLD) .int for internal IP address resolution (for Active Directory, internal websites, etc.). For example, the domain exampleinternalsite.int would resolve to the some internal site that isn’t visible to the public. Our organization has not registered these domain names with a registrar. Now I know that this is bad practice, but Bill remains unconvinced that this shouldn’t be done.

What are the problems with using a live top-level domain for internal name resolution? Specifically, what are the security implications? In addition, does this somehow conflict with some fundamental way on how DNS and name resolution is supposed to work?

Note: I originally asked this question on Network Engineering SE and was kindly referred over to this site as a better place for this question.

Email sent to 2 addresses with shared same organization domain @123abc.com and one bounced back. Was it successfully delivered to the other address?

It is my first time asking questions, so my apologies if there is any mistakes. I sent an email to 2 addresses (2 different departments in same organization with shared @123abc.com), one bounced back from mailer-daemon@googlemail.com due to ‘address not found’. I later found out it was a generated email address. Could someone please tell me if my email was successfully delivered to the other ‘good’ address (the other department)? Thank you very much for your great help in advance.

What does it mean if a domain does not have any WHOIS information available?

For example, I found two websites that mimic my domain name perfectly eg mydomainname.com, with the two offending websites being mydomainname.bw and mydomainname.br. However the domains are not linked to any IP, nor do they have any WHOIS information available. The only way I can see that they are even registered is if I go to a domain seller that deals with .bw and .br TLDs, they tell me that the domain cannot be purchased. Does that mean the domain is just "reserved" somehow and nobody registered it?

Confusing domain name extensions

There are similar domain name extensions, which are really confusing (at least to me) such as these:

.gift and .gifts

.game and .games

.football and .futbol

This means, in the future, extensions like .coms .nets .orgs may be available.

What are the criteria used to allow these new domain name extensions and who is regulating this ?

Security Benefits of Having a Content Security Policy for a Domain Loaded through iframe

Consider the below scenario:

There’s a checkout webpage that can be accessed at checkout.example.com. This page has decent security policy. But just to prevent any credit card info leakage, credit card information editing panel is in an iframe and this panel can be loaded from cc.example.com.

Now, are there any security benefits for having a good Content Security Policy for cc.example.com when we are loading it in an iframe in checkout.example.com?

IP doesn’t change to the domain name

I am facing this problem for quite a long time. When I enter the IP address of my website it take me to the website but the IP address doesn’t change to the Domain Name. I am hosting my website on a Virtual Machine on Google Cloud. I am using the Google Cloud service as a hosting service for my website. Can someone help me in solving this problem?

Restrict CA to issue certficates for one domain or to be able to sign just one server certificate

I have a server and I want my iPhone to connect to it securely. However, I cannot just install the self-signed server certificate on my iPhone. When I install the profile (that’s what they call the certificate), it says "Not verified".

Normally, you would go to CA Trust settings and enable full trust for the certificate. BUT I deliberately made the certificate with critical,CA:false constraint. That’s the reason it does not show in the CA Trust settings.

Why did I do it — I just need to install the single certificate and I don’t want to totally compromise my iPhone security, if my CA credentials got stolen.

Do this have a solution? iOS probably requires a CA to trust a certificate, but I don’t want a possibility to create certificates at all (beside the one), or at least for another domains.


One potential "solution" might be to create the CA, sign the server certificate and then delete the CA key, as it would not be needed and would live for a shorter time (lower chance to get stolen).

However, people except me wouldn’t be stoked to install it. (I don’t want to buy a certificate as its a home project and I don’t even have a domain name, just the IP address.)

The certificate complies with apple’s current requirements for server certificates. (https://support.apple.com/en-us/HT210176)

Do the War Domain cleric’s Channel Divinity options Guided Strike and War God’s Blessing stack?

The War Domain cleric has the Channel Divinity option Guided Strike (PHB, p. 63):

Starting at 2nd level, you can use your Channel Divinity to strike with supernatural accuracy. When you make an attack roll, you can use your Channel Divinity to gain a +10 bonus to the roll. You make this choice after you see the roll, but before the DM says whether the attack hits or misses.

The Channel Divinity option War God’s Blessing allows an identical benefit to extend to another creatures:

At 6th level, when a creature within 30 feet of you makes an attack roll, you can use your reaction to grant that creature a +10 bonus to the roll, using your Channel Divinity. You make this choice after you see the roll, but before the DM says whether the attack hits or misses.

If two War Domain clerics were in the same party, and one uses Guided Strike to add +10 to their attack roll, could the other War Domain cleric use War God’s Blessing to add a further +10 to that attack roll?

Or would they not stack, as they are the same source (i.e. a War Domain cleric’s Channel Divinity)?