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.
B.S.C.M. I.T.T. Tech
A.A.S. I.T.T. Tech
Original Message:
Sent: 12-04-2025 14:45
From: Marcos Silva
Subject: CGNAT capacity SRXs and MS-MPC-128G
Hi, eugene1973, I didn't quite understand your question.
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Marcos Silva
Original Message:
Sent: 12-03-2025 20:39
From: eugene1973
Subject: CGNAT capacity SRXs and MS-MPC-128G
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?
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Adrian Aguinaga
B.S.C.M. I.T.T. Tech
(Construction Management)
A.A.S. I.T.T. Tech
(Drafting & Design)
Original Message:
Sent: 11-26-2025 14:08
From: Marcos Silva
Subject: CGNAT capacity SRXs and MS-MPC-128G
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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