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Port Mapping

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Rare Earth Juejin Tech Community
Rare Earth Juejin Tech Community
Jan 13, 2025 · Operations

Using FRP for Intranet Penetration and Flexible Port Mapping – A Practical Guide

This article explains the limitations of existing intranet penetration tools, presents a custom SSH port‑mapping script, and provides a step‑by‑step tutorial on deploying FRP (frps and frpc), configuring tunnels, managing services with systemd, and verifying port forwarding through the FRP dashboard.

Intranet PenetrationPort MappingReverse Proxy
0 likes · 13 min read
Using FRP for Intranet Penetration and Flexible Port Mapping – A Practical Guide
IT Services Circle
IT Services Circle
Jan 30, 2023 · Fundamentals

Understanding NAT, NAPT, and How Private IPs Communicate with the Public Internet

This article explains why home networks use private 192.168.x.x addresses, how NAT devices translate private to public IPs, the roles of SNAT and DNAT, the extension to NAPT with port translation, and techniques such as NAT traversal and hole punching that enable inbound connections from the Internet.

IPNATNAT traversal
0 likes · 15 min read
Understanding NAT, NAPT, and How Private IPs Communicate with the Public Internet
Practical DevOps Architecture
Practical DevOps Architecture
Nov 24, 2020 · Cloud Native

Docker Port Mapping and NAT with iptables: A Comprehensive Guide

This guide explains how Docker uses -p and -P options for port mapping, how to bind specific host IPs and protocols, view mappings, combine multiple bindings, and expose un‑mapped containers later via host iptables NAT rules for full network access.

ContainersDockerLinux
0 likes · 9 min read
Docker Port Mapping and NAT with iptables: A Comprehensive Guide