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Placement NAT in Instant infrastructure

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  • 1.  Placement NAT in Instant infrastructure

    Posted Jul 21, 2014 06:03 AM

    Hi!

    I want ask you about mechanism of working Instant mode.

    For example I have network (attachment) where is router with two interfaces: Eth 0 is for LAN (DHCP enabled), Eth 1 have public IP (Internet), between interfaces there is NAT. IAPs have IP from dhcp. Clients get address from default dhcp on Instant (assigned by virtual controller, 172.16.31.0/24).

    I assume (which is pretty obvious) in this network we have two NATs:

    -between clients and IAPs

    -between IAPs and publc IP

    My question is where the NAT between clients and IAPs taking place? Is it on every IAPs separetly (for example when client is connected to IAP with IP 192.168.1.3, NAT is on that IAP) or maybe all non-master IAPs forward traffic to master IAP and on master is NAT? Do you have any ideas?

    Thanks in advence!



  • 2.  RE: Placement NAT in Instant infrastructure
    Best Answer

    Posted Jul 21, 2014 06:20 AM

    In case the SSID being VC assigned, VC Master acts as the DHCP server and the gateway. So when traffic of the clinet is going out of the IAP, it goes through the VC and it does the Natting for the clients in the VLAN.

     

    You can check these through commands:

    show datapath session (You will see a "S" flag for Src-NAT)

    show dhcp-allocation (IP address allocated from VC's DHCP scope)



  • 3.  RE: Placement NAT in Instant infrastructure

    Posted Jul 21, 2014 06:31 AM

    Thanks!

    To clarify, NAT is between 172.31.16.0 and Master IP or VC IP?