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  • 1.  CGNAT capacity SRXs and MS-MPC-128G

    Posted 12-01-2025 19:23

    Hello everyone.

    I'm new to the community. My English is poor. I represent an Internet Service Provider (ISP).

    I'm looking for a carrier-level CGNAT solution.

    We work with Deterministic CGNAT: 1 Public IP provides access to 32 Private IPs. With the 65,000 ports of 1 Public IP, we divide them among 32 clients/Private IPs, meaning ~2000 TCP/UDP ports per client.

    My current requirement: 256 Public IPs, 1:32 rule, meaning 8192 Private IPs will be translated (NAPT44). Approximately 500,000 simultaneous CGNAT sessions (TCP, UDP, and non-port-oriented traffic)

    I am unable to find accurate information regarding the simultaneous CGNAT and CGNAT CPS session capacity of the SRX4100, SRX4200, SRX4600, and MS-MPC-128G equipment.

    The datasheets state:
    SRX4100: 5 million connections, CPS 275k
    SRX4200: 10 million connections, CPS 550k
    SRX4600: 60 million sessions, CPS 600k
    MS-MPC-128G: (not found)

    In a forum it was said that:
    SRX4100: only supports 64,000 deterministic CGNAT sessions
    MS-MPC-128G: 380,000 deterministic CGNAT sessions

    I would like the community's help to understand and be sure of the CGNAT capacity of these devices.

    Does anyone have these models in use?



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    Marcos Silva
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  • 2.  RE: CGNAT capacity SRXs and MS-MPC-128G

    Posted 12-03-2025 20:40

    I have an srx550 with a 10g slot card. The sessions go from 380,000 to 409,000 sessions. Perhaps 1/2 of the total connections for the 4100. 2.5 times?



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 3.  RE: CGNAT capacity SRXs and MS-MPC-128G

    Posted 12-04-2025 14:46

    Hi, eugene1973, I didn't quite understand your question.



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    Marcos Silva
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    Original Message


  • 4.  RE: CGNAT capacity SRXs and MS-MPC-128G

    Posted 12-04-2025 18:18

    Perhaps the 409000 sessions follows a model the 4100 uses for sessions. Perhaps you might be able to use 2.5 million connections. I intentionally said 380000, but my srx550 goes from 375000 to 409000 sessions. I did this intentionally because it is very close to the same as 380000. This is to emphasize model differences. Maybe it's not the best example.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------

    Original Message