6 ms·

Does that mean someone can hijack the stream and play some end of world audios?

ChrisMarshallNY 4y ago
Sounds possible, but you’ll have to deal with address contention. Play some good old Rammstein, to make your elevator journey more pleasant.
- andy_ppp 4y ago
  Or the sound of an elevator jamming…
  - lb1lf 4y ago
    This reminded me of an evil prank I did on some friends of mine when in university - CD burners had just become a thing, and at the local concert venue where we volunteered, a handful of burned CDs soon appeared at the mixing console with various music the engineers liked to listen to while getting ready for a gig. Anyway, I ripped the discs, added a nice 50Hz hum under the music and burned new copies which I then left by the CD player. Yup. Cue frustrated sound engineers trying to debug the ground loop which only manifested itself when the CD was playing. I never dared admit to the prank, but rather swapped the hum CDs for the originals before someone got a chance to investigate this thoroughly...
    - bdhcuidbebe 4y ago
      [flagged]
      - srejk 4y ago
        I'm pretty sure 50Hz is electricity, not gas.
      - lb1lf 4y ago
        Back in the nineties, it was a prank.
        ChrisMarshallNY 4y ago
        I attended the 1989 MackHack[0]. I had the Oscar The Grouch trash can hack. I also wired all our Macs to run the Energizer Bunny hack. That was fun. It would have gotten me fired, a few years later, though. [0] https://www.washingtonpost.com/archive/business/1994/06/27/the-annual-machack-attack/a6962056-5f81-41b8-a848-847a5eb087d1/ https://www.washingtonpost.com/archive/business/1994/06/27/t...
    - dylan604 4y ago
      being in similar situations of hunting down the source of a hum, i hope you rot in hell ;-)
    - hot_gril 4y ago
      Hey, they should test with separate CDs. Not your fault at all. Ok, maybe a little.
    - leviathant 4y ago
      oh my god.
    - andy_ppp 4y ago
      This is cold af. Well played.
  - AbusiveHNAdmin 4y ago
    [dead]
- clbrmbr 4y ago
  Maybe send unicast replies at a high rate to the transmitter so as to crash it or at least show down it’s stream so you can take over?
pvaldes 4y ago
Come play with us Danny, but only broadcasted in the room 147
jcrawfordor 4y ago
We can't assume that any given hotel network is well-configured, but most enterprise networking equipment verifies the source of multicast traffic against the multicast routing tables. This means that if you simply send packets with a source address matching the real multicast source, the network devices will ignore and not forward them. This reverse-path check is a standardized part of PIM, the most common protocol that network devices use to communicate multicast groups between each other. It's also enabled by default on Cisco devices for local groups and I would assume the same of other vendors. That said, it's considered a best practice (although not really all that common) to use ipsec or another method to provide cryptographic authentication of multicast packets. The protocol discussed here may do so.

Sounds possible, but you’ll have to deal with address contention. Play some good old Rammstein, to make your elevator journey more pleasant.

andy_ppp 4y ago
Or the sound of an elevator jamming…
- lb1lf 4y ago
  This reminded me of an evil prank I did on some friends of mine when in university - CD burners had just become a thing, and at the local concert venue where we volunteered, a handful of burned CDs soon appeared at the mixing console with various music the engineers liked to listen to while getting ready for a gig. Anyway, I ripped the discs, added a nice 50Hz hum under the music and burned new copies which I then left by the CD player. Yup. Cue frustrated sound engineers trying to debug the ground loop which only manifested itself when the CD was playing. I never dared admit to the prank, but rather swapped the hum CDs for the originals before someone got a chance to investigate this thoroughly...
  - bdhcuidbebe 4y ago
    [flagged]
    - srejk 4y ago
      I'm pretty sure 50Hz is electricity, not gas.
    - lb1lf 4y ago
      Back in the nineties, it was a prank.
      - ChrisMarshallNY 4y ago
        I attended the 1989 MackHack[0]. I had the Oscar The Grouch trash can hack. I also wired all our Macs to run the Energizer Bunny hack. That was fun. It would have gotten me fired, a few years later, though. [0] https://www.washingtonpost.com/archive/business/1994/06/27/the-annual-machack-attack/a6962056-5f81-41b8-a848-847a5eb087d1/ https://www.washingtonpost.com/archive/business/1994/06/27/t...
  - dylan604 4y ago
    being in similar situations of hunting down the source of a hum, i hope you rot in hell ;-)
  - hot_gril 4y ago
    Hey, they should test with separate CDs. Not your fault at all. Ok, maybe a little.
  - leviathant 4y ago
    oh my god.
  - andy_ppp 4y ago
    This is cold af. Well played.
- AbusiveHNAdmin 4y ago
  [dead]
clbrmbr 4y ago
Maybe send unicast replies at a high rate to the transmitter so as to crash it or at least show down it’s stream so you can take over?

pvaldes 4y ago

Come play with us Danny, but only broadcasted in the room 147

jcrawfordor 4y ago

We can't assume that any given hotel network is well-configured, but most enterprise networking equipment verifies the source of multicast traffic against the multicast routing tables. This means that if you simply send packets with a source address matching the real multicast source, the network devices will ignore and not forward them. This reverse-path check is a standardized part of PIM, the most common protocol that network devices use to communicate multicast groups between each other. It's also enabled by default on Cisco devices for local groups and I would assume the same of other vendors. That said, it's considered a best practice (although not really all that common) to use ipsec or another method to provide cryptographic authentication of multicast packets. The protocol discussed here may do so.