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

Introduced

Version 2.88

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%

External Resources

GRE - Protocol Information

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.

Learn More

Related Protocols

A list of related protocols is below. List of all protocols.

Category	Name	Tag
VPN	IPsec	ipsec	Details
VPN	IP in IP	ip-in-ip	Details
VPN	PPTP	pptp	Details
VPN	GPRS Tunneling	gprs	Details
VPN	OpenVPN	openvpn	Details
VPN	Cisco VPN	ciscovpn	Details
VPN	WireGuard	wireguard	Details
VPN	Ultrasurf	ultrasurf	Details
VPN	Tailscale	tailscale	Details

Integration and Custom Solutions

Do you have any questions about integration, APIs or custom development?

GRE