Explained: DERP Protocol

Imagine two friends trying to pass notes in a room full of locked doors. They can't reach each other directly, so they slip their notes — already sealed in envelopes — to a trusted courier standing in the middle of the room. The courier doesn't open the envelopes. They just read the name on the outside and pass them along. That, in essence, is DERP. DERP stands for Designated Encrypted Relay for Packets . It's a protocol designed to … Read More

Explained - IPSec VPN Tunnels

IPSec VPN Tunnels A deep-dive for engineers who need to reason about IPSec at a design level; not just configure it. There's a reason IPSec has survived decades of evolving network architecture; it's not elegant, but it's thorough. Understanding it properly means getting past the surface-level "it encrypts your traffic" explanation and into how the protocol suite actually negotiates, wraps, and protects packets at every hop. W… Read More

Java - How to find the IP Address of a host in Java ?

In Java, if you are looking to resolve an IP Address from the given hostname, then you can leverage the capabilities provided by InetAddress . It belongs to the "java.net" package and provides various utilities related to resolving addresses and IPs. Read More