12-15-2012 02:30 PM
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
Solved! Go to Solution.
12-16-2012 01:23 AM
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.
12-17-2012 09:05 PM
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.
12-16-2012 01:23 AM
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.
12-17-2012 07:51 AM
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
12-17-2012 09:05 PM
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.
12-18-2012 07:18 AM
Hi Jennifer,
Many thanks for all the replies.
Regards
MAhesh
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