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A comment on Tunneling traffic through DNS, a.k.a free internet in cafes/airports. Parent comment

Re:Tunneling traffic through DNS, a.k.a free internet in caf... by randomtask on Thursday March 12, 2009 @06:27AM (#513267)
Generally though wireless hotspots allow DNS traffic out (the DNS server isn't filtered) but not ICMP. In fact if anything is filtered it tends to be ICMP. I'm not really aware of any situations where ICMP tunnelling is useful. Anyone know of any?
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