At the simplest form – the question is to block external proxy due to an emergency situation due to which management have forced technical teams to get a solution to block all the external proxy or share external proxy list for blocking.
While, I do understand, there’s multi-million cache proxy floating around the inter-intra-net which isn’t just feasible to extract out; what are some of the best countermeasures one could take in order to resolve, in-case events turn out to happen in such emergencies as mentioned in the hyperlink above?
Judging from the attacker’s perspective, this emergency might just be a DDoS attack via botnets or external proxy’s and I have had read caching proxy could serve purpose but I’m more open to more than one solution for this one. Any insight on solutions could really help.