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9.7. PPTP Firewall Rules
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PPTP - AXS Guard Documentation
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FreeBSD: How to Install and Configure a PPTP VPN server with mpd5 on FreeBSD 8.2 « blog.up-link.ro
Beckhoff Information System - English
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Port 1723 - Tech-FAQ
TP-Link Safestream Multi WAN VPN Router | 1 Gigabit WAN+3 Gigabit WAN/LAN+1 Gigabit LAN Port | IPsec/L2TP/PPTP VPN Supported| SPI Firewall | DoS Defense | Lightning Protection(TL-R600VPN) TL-R600VPN | Fast Server Corp.