Here is the error you get "bad owner name" when a name uses characters that are not supposed to be used in a domain name:. The check-names option is currently the only way to fix this problem i.
The policy is a "grant". This means we are going to allow a certain command to modify our DNS. The granularity is small enough that we can offer such with enough assurance that it won't allow hackers to completely destroy take over your DNS. This is a reference to your encryption key. It is used to communicate between the client and server in such a way that it proves that the client knows us the client has to have a copy of the key to be able to communicate with us.
The sub-domain name which the client can temper with. This means only that one name is going to be updated by clients. All the other names can't be changed at all.
Further, we specify the exact type of information can be modified. By using the "txt" type, letsencrypt limits permissions to the name which does not allow them to transformed that name with a valid IP address.
The output of the dnssec-keygen command are two files:. We are interested by the. That file includes the key encoded using base I show in blue what we are interested by. Copy that value from this file and paste it in a. Now you need to include this key in your named.
If you have SE Linux, you may instead need to use bind:bind for the ownership. Here the key name is just letters and an underscore. No period. Notice that in the grant definition above we have a period at the end.
When no errors are discovered, the command returns as is no output. When errors are displayed, you may want to also look at the logs for additional hints about the potential problems. With the I specify the domain name server DNS to query. This way I directly query the source. The second parameter to dig is the name of the domain I'm testing. To make sure that the grant we just defined in BIND9 works, we can use the nsupdate tool.
This tool gives you a way to send commands to your DNS. Testing with one of these computers is likely to not check the grant itself. You'll have to wait 1 min. I changed the path because I'm on a different computer which is not a nameserver otherwise the test may succeed even though the grant would not allow the user to otherwise change the zone settings. The update add Here we set a TXT field to the value "test". The show command is not necessary.
It gives you a way to see whether you type things right if you can understand the output The send command is what sends the UDP request to your server. For example, if you use the wrong key, it will fail.
But assuming that you get everything right on your client computer, the command will fail only if the DNS does not authorize you to make the update.
Once the nsupdate says it worked i. I'm not totally sure what happens. Note that the axfr requests a full transfer of the zone. For unknown clients, this feature is turned off by default.
For this command to work you actually want to run it on one of your DNS servers primary or secondary. As we can see in the output highlighted in blue the TXT field was added as expected. If not added, you're on your own buddy!
Maybe re-read my document here and see whether something could have gone wrong. The logs often tell you why BIND9 refused the update transaction. Once this works, the certbot will also be able to make such changes and that's sufficient for your system to receive a wildcard type of certificate. In order for certbot to access your DNS, it needs to have access to your key. The key will be transmitted to the letsencrypt servers which in turn verify that you own your domain before issuing the certificate.
The example shows a private IP. As we can see, the command references the certbot. The --dns-rfc command line option tells certbot how to handle the domain name verification: directly with your DNS information as defined in the certbot. The -d option specifies the name of the domain for which you want a certificate. Notice that to get a wildcard certificate, you want to use an asterisk. That way all the sub-domains created for restarchitect. However, you also want the name by itself because the wildcard only doesn't match the name without a subdomain.
If you want to protect multiple domain names with the same certificate, you can do so using additional -d command line options. For example, in my case I had the. There is a limit to the number of -d options you can use. Last time I checked it was , which I think is plenty, especially if you use a wildcard certificate. Note: If you forget to include a certain domain, you can later add it using the --expand option. The server can use this Host header to distinguish requests to different sites virtual hosts that use the same physical hardware and HTTP server process.
You can divide a parent domain such as example. This provides each site with its own distinct namespace for example, company1. The examples in this topic describe the configuration for BIND only.
For example, for Ubuntu systems, you can use the following command:. The service and packages are generally called bind , bind9 , or named. You can configure BIND using the named. This configuration file is typically set up with include entries to make configuration and upgrade easier, and which should be easy to follow. The simple example described in this topic uses a flat file only.
There are two main parts to the configuration:. The following are some example DNS options that you can configure for your installation in the named. The next step is to configure default zones for the These settings configure addresses for mapping localhost to These example options are described as follows:.
You must now configure your wildcard domain. Here you specify the name of the domain for which to serve wildcard addresses. This is almost identical to the localhost zone already configured. Finally, your zone configuration now includes references to two separate domain zone files in this case, localhost.
The domain zone files dictate how the server responds to requests for data in the specified zone. For example, your basic localhost. In this file, is shorthand for the domain, and describes the first and only record in the file. Thanks again! Show 1 more comment. To set a subdomain wildcard in bind you should use the following format: name.
Pedro Lobito Pedro Lobito 1 1 gold badge 4 4 silver badges 12 12 bronze badges. I hope I make myself clear. Come back to me if you need more info. Istvan Istvan 2, 3 3 gold badges 20 20 silver badges 28 28 bronze badges. So I should add another zone for nsdomain. So if you have 2 zones like somedomain.
Short answer is yes, you have to set up another zone. DNS wildcards can cause troubles! The primary issue is clearly explained as "… Wildcard MXs can be bad, because they make some operations succeed when they should fail instead. Community Bot 1.
Why would be DNS wildcard evil? It is not evil at all I wrote this 8. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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