NIC: Intel E810-XXVDA2 Optics: To ISP: Flexoptics (https://www.flexoptix.net/de/p-b1625g-10-ad.html?co10426=97205 https://www.flexoptix.net/de/p-b1625g-10-ad.h

NIC: Intel E810-XXVDA2 Optics: To ISP: Flexoptics (https://www.flexoptix.net/de/p-b1625g-10-ad.html?co10426=97205 https://www.flexoptix.net/de/p-b1625g-10-ad.html?co10426=972...), Router-PC: https://mikrotik.com/product/S-3553LC20D https://mikrotik.com/product/S-3553LC20D Router: Mikrotik CCR-2004 - https://mikrotik.com/product/ccr2004_1g_12s_2xs https://mikrotik.com/product/ccr2004_1g_12s_2xs - warning: it's good to up to ~20Gb/s one way. It can handle ~25Gb/s down, but only ~18Gb/s up, and with IPv6 the max seems to be ~10Gb/s any direction. If Mikrotik is something you're comfortable using you can also take a look at https://mikrotik.com/product/ccr2216_1g_12xs_2xq https://mikrotik.com/product/ccr2216_1g_12xs_2xq - it's more expensive (~2500EUR), but should handle 25Gb/s easily.