We have had a CCR1072 doing all our NAT for years, but lately it has been unstable. Obviously, we can't just turn off connection tracking, so it looks like we will be replacing it. We are looking at switching to a CHR solution, but we don't know what kind of hardware would be ideal, or how performance would compare to a CCR. We are pushing ~6.5g of traffic at peak, and CPU usage on the 1072 tops out around 25-30%.
Maxxwave has their "Vengeance 3" with an 8-core 9900k CPU, or we could get a used R630 with 2x E5-2698V4 20-core CPUs for about the same money. The 9900k would be faster for single-threaded processes, but the server would have way more cores and cache.
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