mikeage.net @ כ״ב אדר ב' תשפ״א

For anyone interested in clever networking hacks, I strongly advise checking out ptunnel. This software package allows you to tunnel any TCP (such as SSH) over a ICMP (i.e., ping). Since even the most restrictive firewalls (whether corporate, Wifi (don't steal...) or other) usually let ICMP traffic through, this little piece of code can let you access anything you want.
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