Given the definition[1] of the echo protocol works on UDP you could potentially ...

codezero · on July 16, 2015

This is the premise of an old bit of code called Pepsi.c. I recall having juvenile fun with it. Many Cisco routers at the time had these ports open. http://www.hoobie.net/security/exploits/hacking/pepsi.c

coldpie · on July 16, 2015

Source code written by teenagers is always such a joy.

codezero · on July 16, 2015

Especially the greetz and rage. I knew quite a few on both sides 😂

flashman · on July 16, 2015

Doesn't spoofing the IP portion of UDP require a compliant network provider? I thought most upstream links would look at a spoofed packet and say, "Hey... no."

Not that this makes it impossible, just more difficult.

fennecfoxen · on July 16, 2015

Sounds like PingFS. https://github.com/yarrick/pingfs