gre6

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interface/gre6

Type: Directory

Generic Routing Encapsulation (GRE) is a tunneling protocol originally developed by Cisco to encapsulate a wide variety of network layer protocols over an IP network.

Flag	Name	Description
X	disabled	disabled
R	running	running

Argument	Type	Description
name	string	Name of the tunnel.
mtu	num	Layer3 maximum transmission unit of the tunnel. Default: auto — the router subtracts the 44-byte GRE/IPv6 overhead from the outgoing interface MTU (actual-mtu is 1456 on a 1500-byte interface).
local-address	ip6Addr	IPV6 address used for the local tunnel end.
remote-address ( mandatory )	address (flags=6Dvi)	IPV6 address of the remote tunnel end.
keepalive	super { keepalive-interval: time [1 .. ] , [keepalive-retries] [ ,num [1 .. ]] }	The keepalive parameter sets how often the router checks the remote end of the tunnel: the router sends GRE echo probes to the remote end every KeepaliveInterval seconds, repeated up to KeepaliveRetries times. The minimum interval is 1 second and a 0-second setting is rejected; unsetting keepalive turns it off, but on current RouterOS that does not change the running-flag behavior. By default keepalive is set to 10 seconds and 10 retries. On current RouterOS the tunnel keeps the running flag while it is enabled, even when the remote end stops answering; the tunneled traffic is then dropped until the remote end responds again. Parameters are written in the following format: KeepaliveInterval,KeepaliveRetries where KeepaliveInterval is the time interval and KeepaliveRetries is the number of retry attempts.
dscp	num	DSCP value of the packet. Inherited means the DSCP value is inherited from the tunneled traffic.
clamp-tcp-mss	bool	Controls whether to change the MSS size for received TCP SYN packets. When enabled, the router changes the MSS size for received TCP SYN packets if the current MSS size exceeds the tunnel interface MTU (taking into account the TCP/IP overhead). The received encapsulated packet still contains the original MSS, and only after decapsulation the MSS is changed.
dont-fragment	bool	Whether to include the DF bit in related packets. Default: no — yes is rejected on RouterOS 7, only no and inherit are valid. no - fragment if needed. inherit - use the DF flag of the original packet.
ipsec-secret (syscap=security)	string	When a secret is specified, the router adds a dynamic IPsec peer to remote-address with a pre-shared key and policy (by default phase2 uses sha1/aes128cbc).

Read-only Argument	Type	Description
actual-mtu	num	Actual maximum transmission unit of the tunnel.
current-remote-address	ip6Addr	Current IPv6 address of the remote end.