Front Door Vrf Nat

Khawar butt 7 999 views.

Front door vrf nat.

Ospf in our case. By using front door vrf we are isolating transport network usually internet facing and this allows us to configure default route that won t interfere with routing in our global table. David bombal 1 488 views. In order to understand the use of front door vrfs let us use a simple topology as below where we will create a simple gre tunnel between r1 and r4.

In essence we have s speed test server that is available in the cpe s global routing table that we would like the customer in vrf x to test against however due to the fact that customer x is using rfc1918 in their vrf we want to nat all lan traffic destined to the speed server only via the wan address with is public located in. There are other benefits of this design and it s quite commonly used in the sp enterprise world. When internet interface and tunnel interface are in the same vrf on the hub everything works well. I d like to configure dmvpn hub behind static nat.

Stated another way the local endpoint of the ipsec tunnel belongs to the fvrf while the source and destination addresses of the inside packet belong to the ivrf. As you can see we did not move the tunnel11 interface from the global routing table to the routing table for vrf pipe. Default leak from front door vrf to grt nat overload. Trying to get my head round how best to achieve the above.

Ipsec and nat across bgp internet routers. Vrf aware vpn using front door vrf fvrf ivrf duration. The outer encapsulated packet belongs to one vrf domain called the front door vrf fvrf while the inner protected ip packet belongs to another domain called the inside vrf ivrf. But when i put internet interface into separate vrf ipsec fails during phase 2.

00 05 00 ip nat inside source list acl nat out int gi6 vrf internet a overload ip access list extended acl nat out 10 permit ip any any int gi6 ip vrf forwarding internet a ip address 12 45 78 89 30 ip nat outside int gi1 ip address 172 16 0 22 30 ip nat inside ping 12 45 78 90 this. Answers part 1 duration. Both r1 and r4 will learn about the tunnel destination address via underlying protocol i e. If this ip fits into the same subnet as configured on your outside nat interface ip address 209 133 x b 255 255 255 224 so the ip of 209 133 x y looks as directly connected there is a problem with the fact that this interface being in vrf the router in most cases will not respond to arp requests for aliases directly connected ip s for.

Modify the tunnel interface to stitch the tunnel to the front door vrf. Crypto keyring dmvpn vrf internet pre shared key address 0 0 0 0 0 0 0 0 key pass. There must be an entry in the global routing table for example a default route that will send the incoming packet toward the internet facing interface.