I have a RB951G-2HnD running RouterOS version 6.38.3 in CPE router mode connected to my universities WiFi and providing Ethernet to a few devices. For the most part they all have internet access however there’s a few websites I’ve noticed that simply don’t work, github.com and bash.org are two of them, when I ping them I get Host Unreachable errors, same problem from the router and from devices connected to it. These sites are reachable if I connect a device directly to my universities WiFi with no problems whatsoever. I’ve tried factory resetting the router numerous times and the problem has existed through at least the last 4 or 5 versions of RouterOS.
I’m currently bypassing the issue by connecting to a VPN whenever I need to access those sites, but I’d rather not have to. Any suggestions on what could be wrong and how to fix it?