looks like tcp 47, 50 and udp 500
http://www.cisco.com/en/US/customer/products/hw/routers/ps4081/products_tech_note09186a0080094267.shtml

Mike

Thomas N wrote:
> 
> I got a lab setup simulating DMVPN with IPSec over GRE.  I
> would like to
> apply an access control list to the outside interface of the
> routers to
> block everything, except for TCP/UPD ports that are needed for
> GRE, IPSec,
> IKE and those related to DMVPN implementation.  Does someone
> know what ports
> should I open on the ACL?  Thanks!
> 
> Thomas
> 
> 




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