GRE Tunnel not Working

[ciscp]

Hi, I'm new at networking and I was task to configure 6to4 GRE tunnel. I researched the internet, but I could not make it work. I can't ping the Loopback from router 1 to router 2 using the tunnel. Guys please help me.

This is where I referred to: IPv6 over IPv4 GRE with IPSec (networklessons.com)

I did not include the IPsec configuration because I only need the tunnel. Thank you for all of your time.

[Georg Pauwen]

Hello,

are you trying to do this in Packet Tracer ? If so, post the zipped project (.pkt) file.

[ciscp]

Yes. Here is my file.

[Georg Pauwen · Accepted solution]

Hello,

this is definitely a flaw in Packet Tracer, at least in the version I am using (7.3.1.). I tried your exact same configuration in GNS3, and it works right away.

[ciscp]

Yeah but I need this in packet tracer because of requirements. And also I do not know how to use GNS3. For some reason, I don't have Router in there.

[Georg Pauwen]

Hello,

I tried different PT versions, different IPv6 routing protocols, but the only way I get this to work is when the physical interfaces are configured for IPv6 as well (see file attached). I am pretty sure it is a flaw in Packet Tracer.

[ciscp]

But if I ever go with, is this still considered a 6to4 GRE tunneling? Because to be honest, I'm running out of options haha. This is the first time I handle IPv6 that's why I'm not familiar with it. Thanks

[Georg Pauwen]

Hello,

I would think it is, because the source and destination of the tunnels are still IPv4 interfaces and IP addresses.

[ciscp]

OK thank you so much for your time

[MHM Cisco World]

Use same config but

ping with source “which is ipv6”