Networking

Best Practices to Avoid Clashes

For Private Networks

• Use RFC 1918 ranges: 10.x.x.x, 172.16-31.x.x, 192.168.x.x

Use proper private ranges:

10.0.0.0/8       ← Large networks
172.16.0.0/12    ← Medium networks  
192.168.0.0/16   ← Small networks

When Network ID Clashes Don't Matter

Isolated Private Networks

Multiple organizations using the same private ranges:

Company A: 10.0.0.0/16 (internal only)
Company B: 10.0.0.0/16 (internal only)

No problem: These networks are completely isolated behind NAT.

AWS VPCs

Your VPC: 10.0.0.0/16
Someone else's VPC: 10.0.0.0/16

For Public Networks

• Never use someone else's public IP space

• Get your own allocated public IPs from your ISP

• Use NAT to translate private IPs to public