Internet UDP port 1701 is primarily used by Layer 2 Tunneling Protocol (L2TP), a protocol that allows the creation of virtual private networks (VPNs). This protocol is commonly used in VPN services such as NordVPN and ExpressVPN. L2TP is often combined with IPsec to build highly secure VPN connections. Cisco Systems, a major manufacturer of networking equipment, also uses port 1701 for their VPN solutions.
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