Understanding Cloud Server Networking Basics

By Admin · Mar 21, 2026 · Updated Apr 23, 2026 · 742 views · 2 min read

IP Addresses

Every Breeze comes with a public IPv4 address. This is how your server is reachable from the internet.

Finding Your IP

# From the server
curl -4 ifconfig.me

# Or check your Kazepute portal — it's displayed on the server page

Public vs Private IPs

Type	Range	Accessible From	Use Case
Public	Assigned by provider	Anywhere on the internet	Web servers, APIs, SSH
Private	10.x.x.x, 172.16-31.x.x, 192.168.x.x	Same network only	Inter-server communication

DNS Basics

DNS translates domain names to IP addresses.

Common Record Types

Record	Purpose	Example
A	Maps domain to IPv4	`example.com → 198.51.100.10`
AAAA	Maps domain to IPv6	`example.com → 2001:db8::1`
CNAME	Alias to another domain	`www → example.com`
MX	Mail server for domain	`mail.example.com (priority 10)`
TXT	Arbitrary text (SPF, DKIM, verification)	`v=spf1 ip4:198.51.100.10 -all`
NS	Nameserver for domain	`ns1.kazepute.com`

Setting Up DNS for Your Server

Register or transfer your domain in the Kazepute portal
Add an A record pointing to your server IP
Add a CNAME for www pointing to your root domain
Wait for propagation (usually minutes, up to 48 hours)

# Check DNS propagation
dig +short example.com
dig +short www.example.com

Firewalls

UFW (Uncomplicated Firewall)

# View current rules
sudo ufw status numbered

# Allow specific port
sudo ufw allow 3000/tcp

# Allow from specific IP only
sudo ufw allow from 203.0.113.5 to any port 22

# Delete a rule
sudo ufw delete 3

Important Ports

Port	Service	Should Be Open?
22	SSH	Yes (restrict by IP if possible)
80	HTTP	Yes for web servers
443	HTTPS	Yes for web servers
3306	MySQL	No (use SSH tunnel)
5432	PostgreSQL	No (use SSH tunnel)
6379	Redis	No (bind to localhost)

Danger Never expose database ports to the public internet. Use SSH tunnels or private networking for database connections.