Support Forum
The Forums are a place to find answers on a range of Fortinet products from peers and product experts.
zohaibm27
New Contributor

GRE Tunnel not established from Cisco

Hi,

 Previously, I was using Cisco both sides HO and Site A and connectivity established with gre tunnel . But recently I have purchased 100D for HO Office and I have tried established gre tunnel but unfortunately gre tunnel could not be established.

Can anyone know that compatibility of gre tunnel with cisco or Am I missing configuration.

 

Thanks,

Zohaib Khan

3 REPLIES 3
emnoc
Esteemed Contributor III

Will without the configuration we can't tell you if anything is missing

 

There's no compatibility issues between a  cisco router and fortinet firewall. Is the cisco side set for GRE-KAs? You mihgt want to disable that and you can do a packet capture with the diag packet sniffer on the name  gretunnel-name

 

Ken

 

 

PCNSE 

NSE 

StrongSwan  

PCNSE NSE StrongSwan
zohaibm27
New Contributor

OK, Thanks for answer.

 

I will review fortigate and cisco configuration.

 

Zohaib

Johan_Witters
Contributor

tunneling between a FGT and a Cisco device should not be a problem, probably there is a misconfiguration somewhere..

 

Fortinet has published several KB articles describing IPSec tunnels between Fortigates and Cisco devices (ASA, PIX, routers etc). Check http://kb.fortinet.com/kb and search for "cisco ipsec".

Johan Witters

Network & Security Engineer

FCNSP V4/V5

 

BKM NV

Johan Witters Network & Security Engineer FCNSP V4/V5 BKM NV
Top Kudoed Authors