Thanks a lot!

[delneg]

Thanks a lot, with the help of you project I've been able (after some trial & error) to write my own DNS server implementation - altough I've decided to do it in C# (because that's what I'm learning right now) and not in Rust (also, copy-paste Rust code seemed too easy).
You can check it out at https://github.com/delneg/dns_server_csharp
There are also branches for each chapter, if you're interested

[EmilHernvall]

Glad you found it useful. Looks like a nice project, so well done. :) I'll consider adding a section for ports to other languages, and link to it.

[Schachte]

@EmilHernvall Really enjoying this guide, it's been a lot of fun. Any plans for others like this?

[EmilHernvall]

Maybe. :) There are some other protocols that I'd like to try, like DHCP and SMTP, but not sure when I'll get to that.

[Schachte]

Ooo SMTP would be great fun!

[exFalso]

Adding my thanks, this guide was extremely helpful in implementing a custom dns server. I particularly liked the progressive breakdown

[notthatjesus]

Just adding my thanks for this!
Started going through it, trying to build an ENUM (NAPTR records) server for Telephony purposes. This is being extremely helpful

Just a qq... I can see in the DnsHeader struct a boolean field called "checking_disabled" but I can't find anything in the RFC or the packet itself about it. What's its purpose?

[machsix]

Just adding my thanks for this! It's educational and informative.

[v-tyan]

@notthatjesus
> Just a qq... I can see in the DnsHeader struct a boolean field called "checking_disabled" but I can't find anything in the RFC or the packet itself about it. What's its purpose?

There were three reserved bits (Z) as per RFC 1035 originally. But, as mentioned in the guide, later on they were used for DNS Security Extensions (DNSSEC)
Thats where two new bits were added in plase of reserved ones, AD (authentic data) and CD (checking disabled).
You can check the new Header Structure in the RFC 2065 section-6.1

It seems that the author of the DNS guide implemented the new DNSSEC Header structure, but new bits were out of scope of the project and were never used.

P.S. i was confused too about those fields and only found your unanswered question.
Leaving this comment in case this might clear up someone elses doubts :)

[64J0]

@v-tyan I was going to open a new issue just to ask about it. Thanks for sharing!