I am setting up my server lab, can you please recommend an affordable and very reliable router than can handle over 100,000 simultaneous open tcp connections without breaking a sweat?
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When you say "handle over 100,000 simultaneous open tcp connections", what do you actually mean? A router that is capable of having that number of TCP connections flowing through it? That can handle that number of TCP connections terminating on it (SSH or telnet sessions to it, web requests to the built-in web server, FTP connections to the built-in FTP server)? That can sensibly do flow-based decisions on 100k+ flows?
If it's "just" TCP sessions flowing through it and being routed, what's the expected number of packets per second for each flow? If you're looking at ~10 pps per session, you're looking at (at least) 1 Mpps through the router.
According to this document:
So, depending on what you mean by "handle 100k TCP sessions", it looks like the 7200 is towards the lower end of what you want.