topic Re: GRE Tunnel (Packet Tracer Bug?) in Network Security

GRE Tunnel (Packet Tracer Bug?)

Thomas Leong — Fri, 16 Apr 2021 08:50:49 GMT

Hi Guys,

i have some issue with GRE Tunnel in Packet Tracer during my Training.. all the setup is correct, both tunnel is up/up, but i dk why it just cannot go like 192.168.1.2 -> 192.168.25.2 -> 10.0.0.2

Re: GRE Tunnel (Packet Tracer Bug?)

Rob Ingram — Fri, 16 Apr 2021 17:56:26 GMT

Hi @Thomas Leong

Do you have the routing (dynamic or static) configured so each endpoint PC knows how to reach the other? Do the PCs have a default gateway setup for the local router's IP address?

Re: GRE Tunnel (Packet Tracer Bug?)

Thomas Leong — Fri, 16 Apr 2021 16:54:36 GMT

Re: GRE Tunnel (Packet Tracer Bug?)

Rob Ingram — Fri, 16 Apr 2021 17:08:29 GMT

@Thomas Leong

You've got the wrong tunnel destinations configured. The tunnel would be between the R0 and R3 outside interfaces, not the inside interfaces. Change to the following:-

Tunnel1
tunnel destination 192.168.4.2

Tunnel1
tunnel destination 192.168.2.1

HTH

Re: GRE Tunnel (Packet Tracer Bug?)

Thomas Leong — Sat, 17 Apr 2021 02:15:28 GMT

Hi Rob Ingram,

Thanks for your correction, but the tunnel still not working, not sure why....

Thanks,

Thomas

Re: GRE Tunnel (Packet Tracer Bug?)

Thomas Leong — Sat, 17 Apr 2021 04:19:54 GMT

Hi Rob,

i think there some bug on packet tracer causing gre tunnel not working. because i try to rebuild gre tunnel it works. =.=

Thanks,

Thomas