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A comment on Firefox Send: Private, Encrypted File Sharing. Parent comment

Re:Firefox Send: Private, Encrypted File Sharing by TD-Linux on Wednesday October 11, 2017 @08:52PM (#15454842)
STUN allows all sorts of hole-punching for cases where both peers are behind NATs. For cases where the hole-punching doesn't work (a user behind two NATs might be one case), you can use TURN which is a dumb UDP or TCP relay.
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