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mahesh18
Frequent Contributor

Using Gre Tunnel between devices on Same LAN

Hi Everyone,

When we need to use Gre Tunnel on same side means on 2 devices connected to each other on LAN?

Whats is benefit of using GRe Tunnel on LAN ?

Thanks

MAhesh

2 ACCEPTED SOLUTIONS

Accepted Solutions
Jennifer Halim
Cisco Employee

Typically GRE tunnel is not used on the same side/network.

It is used to connect 2 networks and pass traffic through.

Benefit of GRE is it can participate in the routing protocols so it becomes a hop through the tunnel instead of multiple hops through various devices. Further to that, GRE is also used to tunnel traffic which is not natively supported by those devices where the unsupported type of traffic can't pass through.

View solution in original post

Yes, absolutely correct.

Once it hits the tunnel on this side, it will only take one hop to reach the remote tunnel end. If the tunnel goes through multiple ISP hops, traceroute will only show the tunnel as the hop, not anything in between the tunnel as those are being encapsulated within the tunnel.

View solution in original post

4 REPLIES 4
Jennifer Halim
Cisco Employee

Typically GRE tunnel is not used on the same side/network.

It is used to connect 2 networks and pass traffic through.

Benefit of GRE is it can participate in the routing protocols so it becomes a hop through the tunnel instead of multiple hops through various devices. Further to that, GRE is also used to tunnel traffic which is not natively supported by those devices where the unsupported type of traffic can't pass through.

View solution in original post

Hi Jennifer,

Thanks for reply.

So you mean when GRE traffic passes through tunnel  to reach other side over WAN  link it reaches other site in 1 Hop?

So if i do traceroute from Site A  to IP of site B  then it should be seen as single Hop even though actually it takes few hops

as it goes by ISP network?

Thanks

Mahesh

Yes, absolutely correct.

Once it hits the tunnel on this side, it will only take one hop to reach the remote tunnel end. If the tunnel goes through multiple ISP hops, traceroute will only show the tunnel as the hop, not anything in between the tunnel as those are being encapsulated within the tunnel.

View solution in original post

Hi Jennifer,

Many thanks for all the replies.

Regards

MAhesh

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