Networking & DNS
IP addresses, reverse DNS, ports and traffic.
72 guides · page 3 of 4
IP addresses explained: public, private, shared and dedicated IPs
What an IP address is, how public and private ranges differ, and when a shared or dedicated IP matters for your website, email or server.
IPv4 vs IPv6 explained
A plain explanation of IPv4 and IPv6 addresses, why IPv6 exists, how to read your server's address, and what each means when you connect to a VPS or point a domain at it.
Manage DNS records in cPanel Zone Editor (A, AAAA, CNAME, TXT, SRV, CAA)
Add, edit and delete DNS records for your domains in cPanel Zone Editor, with real examples for A, CNAME, TXT, SRV and CAA records and TTL advice.
MX records and Email Routing in cPanel (use Google Workspace or Microsoft 365)
Change MX records in cPanel Zone Editor, set Email Routing to local or remote, and connect Google Workspace or Microsoft 365 while keeping your website on MdmHost.
NAT, masquerade and port forwarding with nftables
Use nftables to masquerade VPN clients out through your VPS and forward ports to a backend with DNAT. Includes IP forwarding, forward chain rules and a complete VPN gateway ruleset.
Point a subdomain to your home IP with cPanel Dynamic DNS
Use cPanel Dynamic DNS to keep a subdomain such as home.example.com pointed at a changing home or office IP, with the update URL, router setup and a cron example.
Port forwarding and masquerading with firewalld
Forward a port to another local port or to a different host with firewalld, enable masquerading so replies find their way back, then test and make the rules permanent.
Port forwarding and NAT with UFW before.rules
Forward a public port on your VPS to a backend server or VPN client with UFW. Turn on IP forwarding, add a nat table to before.rules, allow routed traffic and test from outside.
Port speed vs bandwidth: what network specs mean
Learn what port speed in Mbps or Gbps, monthly transfer and real-world throughput mean, so you can read the network specs on any hosting plan with confidence.
Ports, protocols and TCP vs UDP explained
How ports and protocols let one server run many services, the real difference between TCP and UDP, and which one common services use.
Proxy vs VPN vs reverse proxy: what each one does
The practical difference between forward proxies, SOCKS, VPNs and reverse proxies, and which one fits admin access, privacy, IP whitelists or a website.
Reduce latency to your broker: location and ping checks
Find where your broker's trade servers are, choose the nearest location, and measure latency from the VPS with MetaTrader, ping and tracert.
Run an IPv6-only VPS: reaching IPv4 sites with NAT64 and DNS64
Why IPv6-only VPS plans exist, what breaks without IPv4, how NAT64 and DNS64 let you reach IPv4-only services, configuring a public NAT64 resolver, and making your site reachable for IPv4 visitors.
Set up a cPanel DNS cluster in WHM (root guide)
Link cPanel servers or dedicated DNS-only servers in a DNS cluster as root: roles, API tokens, synchronisation and checks so zones stay online if one server fails.
Set up a private network between VPS servers
Connect web, database and cache servers privately: provider private networks and VLANs, configuring a second interface with Netplan, binding services to private IPs, firewalling, and VPN alternatives.
Set up a Squid forward proxy server on Linux
Install Squid on a Linux VPS as a private forward proxy, restrict access by IP and password, block domains, enable caching and test it from a browser or curl.
Set up an authoritative DNS server with BIND on Linux
Install BIND, create a primary zone file for your domain, disable open recursion, add a secondary server with zone transfers, register glue records and test with dig.
Set up an HAProxy load balancer for web servers
What a load balancer does, common balancing algorithms, and how to install HAProxy on Linux to spread HTTP traffic across two web servers with health checks and HTTPS.
Set up private nameservers with glue records (ns1.yourdomain.com)
Create branded private nameservers like ns1 and ns2.yourdomain.com: register glue records at your registrar, add matching A records, point client domains to them and verify.
Set up Unbound as a local caching DNS resolver on a server
Install Unbound as a private recursive, validating DNS resolver for your server or network, restrict who can query it, enable DNSSEC validation and point the system at it.
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