Dark Developments Where Knowledge Meets Power

6Sep/130

DD – Forums

Posted by Dark#Basics

We've just setup the new forums at www.darkdevelopments.org/forums or use the Forums button at the top of the website. Due note that it's still under review and major changes can still occur.

More info at www.darkdevelopments.org/forums/viewtopic.php?f=2&t=2

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22Aug/110

DNS – Domain Name System

Posted by Dark#Basics

DNS - Domain Name System

As most of you know DNS stands for Domain Name System and translates the names of websites, computers,.. to the correct IP-addres.

The practical implementation contists out of three parts namely the stub resolver, caching/recursing resolver (recursor) and the authoritative nameserver.

The stub resolver builds the DNS-packet that needs to be send to the recursor and the recursor queries the authorative nameservers.

A URL consits out of different labels and these labels are delimited by dots for such as darkdevelopments.org.

The right most label is the top-level domain or root (.org). The hierarchy of domains descends from right to left, each label to the left specifies a subdomain (darkdevelopments).

DNS-records

Data in the DNS is saved as a Resource Record, this consits out of a name, type, TTL and data. The data can be an IP-address or another name.
The following types can be specified within DNS:

- SOA : Start-Of-Authority, holds the settings for the domain like TTL, primairy DNS.
- A : Returns a IPv4 address to map hostnames to an IP address.
- AAAA : Resturn an IPv6 address to map hostnames to an IP address.
- CNAME : Alias of one name to another.
- MX : Maps a domain name to a list of message transfer agents.
- PTR : Used for reverse lookup.
- SPF : SPF allows administrators to specify which hosts are allowed to send mail from a given domain by creating a specific SPF record (or TXT record) in the Domain Name System (DNS).
- SRV : Generalized service location record, used for newer protocols instead of creating protocol-specific records such as MX.

Forward / Reverse Lookup Zones

A zone is a group of addresses where the DNS-server is responsible for wihtin a certain namespace. In most cases this means the domain for example Active Directory.

If different subdomains arent in the same zone then those subzones are deligated. This means that the parent domain has created a pointer to the DNS-server that is responsible for the subzone.

Forward zones convert the hostname to the appropriate IP by using A, CNAME, MX, NS... Reverse lookup zones are used to translate the IP to the appropriate hostname by using the PTR-records.

Advanced DNS

It is possible to setup a secundairy DNS-server that contains a readonly copy of the primary DNS-server. The servers will replicate the DNS-records at certain times (Refresh interval, Retry Interval, Expire Interval). TTL contains the information how long a DNS-records needs to be cached.

Cheap Load Balancing

By using the different A-records with the same name but different IP DNS will use round robin.

DNS Server Roles
Primary - Is the only server where the content of the zone-file can be altered. This means adding, deleting, modifing records within a zone. Only one server can be the primary DNS-server in exception of Active Directory.
Secundairy - All servers that contain a read-only copy of the zone-file of the primary server, can be multiple servers.
Cache-Only - Does not contain zone information but cached queries for clients.
Forwarder - Transfers queries to another DNS-server (recursive).

DNS & Active Directory
When installing an Active Directory environment with DCPROMO, DNS will be automaticly installed. Because otherwise the domainname could not be resolved to the domain controller.

More detailed information about DNS can be found at en.wikipedia.org/wiki/Domain_Name_System

10Jan/110

Technical Difficulties

Posted by Dark#Basics

Our sincere apologies but due to technical difficulties we have to delay the opening of the forums. We will try to get the forums open as soon as possible.

The DarkDevelopments[dot]org Staff

Update 1: The forums server internet node has dropped, delaying the opening - if it comes back up, forums will still be opened today!
Update 2: Forums node is back up, forums will be published today.

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8Jan/110

Announcement

Posted by Dark#Basics

DarkDevelopments forums will be opened January 10th.

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2Jan/110

DarkDevelopments[dot]org – LOGO

Posted by Dark#Basics

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2Jan/110

The Beginning

Posted by Dark#Basics

As from today I'm glad to announce that we have a new, fresh version of DarkDevelopments. As some of you might know, DarkDevelopments also colloquially known as DD was a forum that supported and helped people when they had questions regarding security, programming, networking, etc... But after almost 3 years DD closed its doors and disappeared.

After a brief conversation with my good friend Ollie, that I first met when I was administrator at DarkDevelopments, I decided that DD needed to come back to life and feed the community once again.

This blog will contain the experiences of all the DD-administrators regarding IT or any other aspect that they want to tell the community. At this time we are trying to set-up the forums where we will provide support, publish tools, post snippets, distribute tutorials, summaries,...

It's glad to be back!

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