Ask about IP address exhaustion

Fuma 21 Reputation points
2022-08-30T05:52:40.6+00:00

I am using openVPN with azure vpn P2S.
I would like to ask about IP address exhaustion.
The configuration of azure vpn is set up as follows.
I would like to use about 5000 for ip address usage.
In that case, what should the "address pool" and other settings of the "azure vnet gateway" be? 

   ■ azure vnet subnet  
   - FrontEnd  
   - 10.1.0.0/24  
     
   GatewaySubnet  
   - 10.1.255.0/27  
     
   address space  
   - 10.0.0.0/16  
   - 10.1.0.0/16  
     
   ■ azure vnet gateway  
   - address pool  
   - 172.16.201.0/24  
     
   tunnel type  
   - openVPN
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  1. KapilAnanth-MSFT 34,926 Reputation points Microsoft Employee
    2022-08-30T07:18:02.03+00:00

    Hi @Fuma ,

    Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
    I understand that you would like to connect 5000 P2S users simultaneously to Azure VPN.

    Kindly correct me if I my understanding is wrong

    For 5000 Connections, you must use the appropriate gateway SKU that supports this.
    Refer: https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-about-vpngateways#gwsku for comparison table

    The following SKUs may suit your scenario,

    • VpnGw4
    • VpnGw5
    • VpnGw4AZ
    • VpnGw5AZ

    With respect to P2S Client configuration address pool, you can use a CIDR of /19 and above.
    Also, this should not overlap with any of your other networks
    For e.g, 10.5.0.0/19 (in your scenario)

    Refer: https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-howto-openvpn

    Please do let us know should you require more details.

    Cheers,
    Kapil

    ----------------------------------------------------------------------------------------------------------------

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