GRE Protocol

Detection Information

The following page provides information on the GRE Protocol.

Protocol Description

GRE (General Routing Encapsulation) is a low-level tunneling protocol used by various VPN implementations: Cisco, IPsec, PPTP and more. The protocol can be used to transport IPv4, IPv6, multicast and other low-level protocols.

Full Name

Generic Routing Encapsulation

Abbreviation

GRE

Best Practices

VPNs can not only be used to connect remote locations, but also be used to bypass your firewall/DNS policies. Investigate any unauthorized use on your network.

Port Statistics

IP Protocol Flow Percent
GRE 100%

Category

VPN

External Resources


Protocol Detection

Do you know how much GRE traffic flows through your network? Netify's protocol detection engine and reporting provides insights to help manage your network.

What gets measured, gets managed.

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Related Protocols

A list of related protocols is below. List of all protocols.
Category Name Tag

VPN

OpenVPN openvpn Details

VPN

Cisco VPN ciscovpn Details

VPN

IPsec ipsec Details

VPN

GPRS Tunneling gprs Details

VPN

PPTP pptp Details

VPN

WireGuard wireguard Details

VPN

IP in IP ip-in-ip Details

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