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Because of the myriad of firewalls and routers that don't understand IP protocols that isn't TCP or UDP. IPsec tunnels were commonly encapsulated in UDP packets
by Laforet 9y ago
Because of the myriad of firewalls and routers that don't understand IP protocols that isn't TCP or UDP. IPsec tunnels were commonly encapsulated in UDP packets for this very reason because its safer to assume that at least one device alobg the way won't understand protocol 50.