I have two MX600's in production in warm spare mode. These are used for firewall/NAT for ~20,000 users/10,000 devices. In total the upstream bandwidth is 4Gbps. We also do two site-to-site VPN tunnels, one is Meraki and the other is an ASA. Plenty of client VPN connections too without and problems. If you want to do a real world speedtest through my MXen, here you go: readingsd.speedtest.net
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