5 ms·

We should probably get these long round-trip protocol issues ironed out before we build our galactic internet

by jb55 15y ago

merijnv 15y ago
TCP is already out as a protocol for our galactic internet, see relevant comment from Linux TCP implementation: /* * [...] Note that 120 sec is defined in the protocol as the maximum * possible RTT. I guess we'll have to use something other than TCP * to talk to the University of Mars. * PAWS allows us longer timeouts and large windows, so once implemented * ftp to mars will work nicely. */
- dave1010uk 15y ago
  (This is from /usr/src/linux/net/inet/tcp.c) This is correct. At their furthest apart, Mars and Earth are 22 light minutes apart. Their closest is almost exactly 3 light minutes. For comparison, the Earth and Moon are just over 1 light second apart. On a more serious note, could tcp.c just be patched on the client to drop packets after ~10sec?
- mooism2 15y ago
  I sincerely hope ftp is a distant memory by the time the University of Mars opens.
  - cpeterso 15y ago
    well, why not? Martian students will need to use something to transfer files. Perhaps SFTP? The International Space Station still uses Kermit! At least they did in 2003: http://www.spacedaily.com/news/iss-03zq.html http://www.spacedaily.com/news/iss-03zq.html
jerf 15y ago
Unsurprisingly, this is a well-known problem: http://ipnpr.jpl.nasa.gov/index.cfm http://ipnpr.jpl.nasa.gov/index.cfm While I don't know that we can fairly say the Internet qua Internet has been extended past Earth (and associated environs), NASA certainly uses a Solar System-scale network already, and while they haven't made a big deal about some of the routing they've already done, if you read the press releases carefully they'll sometimes mention how they routed the signal from one probe through another. It's already a network.
vbtemp 15y ago
I would encourage you all to look at the site dtnrg.org It's for the DTN research group, which among other things is beginning to architect and implement the so-called Interplanetary Internet. Some early trials have been run among NASA, ESA, and JAXA mission-control centers, as well as one flight test on EPOXI (used to be the Deep Impact mission)
- deleted 15y ago
  [deleted]

We should probably get these long round-trip protocol issues ironed out before we build our galactic internet

by jb55 15y ago

We should probably get these long round-trip protocol issues ironed out before we build our galactic internet

TCP is already out as a protocol for our galactic internet, see relevant comment from Linux TCP implementation: /* * [...] Note that 120 sec is defined in the protocol as the maximum * possible RTT. I guess we'll have to use something other than TCP * to talk to the University of Mars. * PAWS allows us longer timeouts and large windows, so once implemented * ftp to mars will work nicely. */

dave1010uk 15y ago
(This is from /usr/src/linux/net/inet/tcp.c) This is correct. At their furthest apart, Mars and Earth are 22 light minutes apart. Their closest is almost exactly 3 light minutes. For comparison, the Earth and Moon are just over 1 light second apart. On a more serious note, could tcp.c just be patched on the client to drop packets after ~10sec?
mooism2 15y ago
I sincerely hope ftp is a distant memory by the time the University of Mars opens.
- cpeterso 15y ago
  well, why not? Martian students will need to use something to transfer files. Perhaps SFTP? The International Space Station still uses Kermit! At least they did in 2003: http://www.spacedaily.com/news/iss-03zq.html http://www.spacedaily.com/news/iss-03zq.html

jerf 15y ago

Unsurprisingly, this is a well-known problem: http://ipnpr.jpl.nasa.gov/index.cfm http://ipnpr.jpl.nasa.gov/index.cfm While I don't know that we can fairly say the Internet qua Internet has been extended past Earth (and associated environs), NASA certainly uses a Solar System-scale network already, and while they haven't made a big deal about some of the routing they've already done, if you read the press releases carefully they'll sometimes mention how they routed the signal from one probe through another. It's already a network.

vbtemp 15y ago

I would encourage you all to look at the site dtnrg.org It's for the DTN research group, which among other things is beginning to architect and implement the so-called Interplanetary Internet. Some early trials have been run among NASA, ESA, and JAXA mission-control centers, as well as one flight test on EPOXI (used to be the Deep Impact mission)

deleted 15y ago
[deleted]