Skip to main content

Understanding SRV vs NS Records in DNS

DNS (Domain Name System) is a crucial part of how the internet works, converting domain names into IP addresses and directing traffic. Within DNS, different types of records serve specific functions. Two key types are SRV (Service Records) and NS (Name Server Records).

SRV (Service) Records

SRV records are used to define the location of specific services. These records are crucial when multiple servers can provide the same service (e.g., VoIP, messaging) and a specific server needs to be selected. They contain the following components:

  • Service & Protocol: Defines the service (e.g., _sip, _xmpp) and protocol (_tcp, _udp).
  • Priority & Weight: Direct traffic to the most preferred server.
  • Port & Target: Specify the server's port and hostname.

Example: _sip._tcp.example.com SRV 10 60 5060 sipserver.example.com

NS (Name Server) Records

NS records delegate the authority for a domain to specific name servers. These name servers are responsible for answering DNS queries and managing domain resolution. If a domain has multiple NS records, DNS clients may query any of them.

Example: example.com. IN NS ns1.example-dns.com

Key Differences

  • Purpose: SRV records define services and their servers, while NS records define authoritative name servers for a domain.
  • Components: SRV records have service-specific details like port and priority, while NS records only specify the name servers.

Understanding these records is essential for managing domains, directing traffic, and providing services online efficiently.

Labels:

Comments

Post a Comment

Popular posts from this blog

How to import Putty Saved Connections to mRemoteNG

Just started using mRemoteNG and its being very cool to connect to different remote connection with different protocols e.g Window Remote Desktop, VNC to Linux, SSH, HTTP connection etc. from a single application. As new user I configured some remote desktop connection which was quite easy to figure out. But when I wanted to add SSH connections, it came in my mind to import all of the saved connections in the putty. But I couldn't figure it out how can it be done, though it was quite easy and here are the steps. Open your mRemoteNG Create a folder if you want segregation of multiple networks Create a new connection Enter the IP address of remote server under connection in Config pane Under the config pane, select protocol " SSH version 2 ".  Once you select protocol to SSH version 2 you are given option to import putty sessions, as shown in the snap below. In the above snap, I have imported CSR-AWS session from my saved sessions in Putty.
1 comment
Read more

Authoritative DNS Servers Delegation and Internal DNS Explained

DNS (Domain Name System) plays a critical role in how users and systems find resources on the internet or within internal networks. Whether it's managing an internal domain in an enterprise or delegating parts of a domain for traffic distribution, DNS setups vary widely depending on needs. In this blog post, we’ll break down the different types of DNS setups, including authoritative DNS servers, DNS delegation, and how internal DNS functions within organizations. 1. Authoritative DNS Server An Authoritative DNS server is the final source of truth for a specific domain. When someone queries a domain (e.g., example.com ), the authoritative DNS server for that domain holds the DNS records (A records, CNAME, MX, etc.) and responds with the corresponding IP address. Key Points: Who can host it? Authoritative DNS servers are often hosted by domain registrars (e.g., GoDaddy, Namecheap) or cloud DNS providers (e.g., AWS Route 53, Cloudflare). However, organizations can also host their ...
Post a Comment
Read more

BGP MED: Managing Inbound Traffic with Multi-Exit Discriminator

The Multi-Exit Discriminator (MED) is used in BGP to control inbound traffic into your AS. It tells a neighboring AS which entry point into your network it should prefer when there are multiple links between your AS and the neighboring AS. The lower the MED value , the more preferred the path. MED is only honored between the same neighboring AS . Example Scenario : You are connected to ISP1 via two routers, CE1 and CE2 , and want to control which router ISP1 uses to send traffic into your AS. Network Topology : CE1 (connected to ISP1): 10.0.1.1/30 CE2 (connected to ISP1): 10.0.2.1/30 iBGP Router (Internal) connected to both CE1 (10.0.1.2/30) and CE2 (10.0.2.2/30). Configuration on CE1 (Lower MED, More Preferred) : Create a route map to set the MED to 50 for CE1: route-map SET_MED permit 10 set metric 50 Apply this route map to the neighbor in the BGP configuration for CE1: router bgp 65001 neighbor 10.0.1.1 remote-as 65000 neighbor 10.0.1.1 route-map SET_MED out Configuratio...
Post a Comment
Read more