0 views
Read
#0
Learn PPTP - Pre-Requisites Skill & Setup Environment
Before building a PPTP tunnel, you need to master networking fundamentals such as IP routing, NAT, and firewalls, plus Linux experience with systemd and package managers. In this episode you set up two Linux VMs, install pptpd and pptp-linux, and verify that the GRE module is available in the kernel.
August 10, 2026
00
Read
#1
Learn PPTP - History, Background & Why PPTP
This episode traces PPTP's origins from the remote access era of the 1990s, the birth of RFC 2637 designed by Microsoft together with several vendors, to the massive adoption on Windows that made it the de facto enterprise VPN standard in the 2000s. You also understand the real problems PPTP set out to solve in its time.
August 10, 2026
00
Read
#2
Learn PPTP - Core Concepts & Main Architecture
This episode dissects PPTP's core architecture: the protocol stack from PPP to GRE to IP, the separation of the control channel on TCP 1723 and the data channel on GRE protocol 47, and the role of each component such as pptpd, pppd, and the client. You also follow the session flow from handshake to data transfer.
August 10, 2026
00
Read
#3
Learn PPTP - Installation & Initial Setup
This episode takes you from zero to your first PPTP connection: installing pptpd on the server, configuring a minimal /etc/pptpd.conf, creating a user in /etc/ppp/chap-secrets, then connecting a pptp-linux client and testing with the Windows built-in client.
August 10, 2026
00
Read
#4
Learn PPTP - PPP & Authentication Mechanism
This episode dissects the PPP layer at the heart of PPTP: the link establishment phase with LCP, the authentication phase, and the network phase with NCP. You compare PAP, CHAP, MS-CHAPv2, and EAP, and understand why MS-CHAPv2 is considered broken.
August 10, 2026
00
Read
#5
Learn PPTP - GRE & Encapsulation
This episode covers GRE as PPTP's data carrier: the structure of the GRE version 1 header, how PPP frames are encapsulated, the added overhead, MTU considerations and MSS clamping, and the limitations of GRE being stateless and not NAT-friendly.
August 10, 2026
00
Read
#6
Learn PPTP - MPPE Encryption
This episode dissects MPPE, the only encryption PPTP has: the RC4 cipher with its key length variants, the key derivation process from the MS-CHAPv2 password, stateless and stateful modes, and weaknesses such as the absence of integrity checks and forward secrecy.
August 10, 2026
00
Read
#7
Learn PPTP - Routing & IP Forwarding
This episode covers the network behind the PPTP tunnel: address management with localip and remoteip, enabling IP forwarding, NAT MASQUERADE so clients can access the internet, the proxyarp option, and the split tunneling concept on the client side.
August 10, 2026
00
Read
#8
Learn PPTP - Logging & Troubleshooting
This episode equips you with PPTP troubleshooting methods: reading pptpd and pppd logs in syslog and journald, enabling pppd debug mode, recognizing common issues such as blocked GRE and MS-CHAPv2 failures, and using tcpdump and other tools to narrow down the cause.
August 10, 2026
00
Read
#9
Learn PPTP - Server Configuration Deep Dive
This episode dives into every important part of PPTP server configuration: /etc/pptpd.conf directives such as options, logwtmp, connections, and listen, plus /etc/ppp/options.pptpd options such as refuse-pap, require-mschap-v2, and ms-dns, and IP pool management.
August 10, 2026
00