Slashdot Mirror
Vint Cerf's Disruption-Tolerant Networking
An anonymous reader writes "Net pioneer, Vint Cerf, talked this week about the space internet (the Interplanetary
Internet), and an interesting 1994 April Fool's email he
penned as a Request for Comment [1607]. The thread involves a reverse time
capsule from the year 2023, but covers Cerf's side interests in Shakespeare.
Since 2004 marks the 30th anniversary of publication of the first paper
on the Internet, his views on the future
of the net and Interplanetary
Internet seem to have morphed somewhat into delay and disruption tolerant
networking because of high demand for videoconferencing, Voice-Over IP, and multimedia."
I wouldn't trust that critcal line of communication if it failed as often as my DSL connection.
Maybe you should think about finding a new ISP?? I was an early adopter of DSL, since 2000, and in those 4 years the longest my connection was ever down was 6 hours. In total, my router has disconnected from my ISP 9 times in 4 years.
The great failing of DSL is that it works great for those close to the CO point, but it's useless to those too far away. It's a true feast or famine situation.
This brings up an interesting step in the path towards trying to settle Mars... would it be a smart idea to have communciations satellites orbiting Mars before we send the first humans?
The current set of satellites provide communication links between the landers and Earth.
Some interesting articles about DTN that were made available on the IPNSIG (Interplanetary Network Special Interest Group) site:
DTN Tutorial (PDF)
DTN Architecture: The Evolving Interplantary Internet (TXT)
DTN for Extreme Environments (PDF)
-----
This brings up an interesting step in the path towards trying to settle Mars... would it be a smart idea to have communciations satellites orbiting Mars before we send the first humans?
The current set of satellites provide communication links between the landers and Earth.
Yes, however it's clear that the limited bandwidth provided by those satalites is not nearly as much as one would wish for an entire human settlement to have to share.
Also it would be smart to have 100% dedicated communications satallites so that there would be less chance of something unrelated to communications causing a problem on the satallite.
Don't get me wrong, the satallites have been great (I work on MER) however we still have to throw away observations due to bandwidth constraint, and we have to wait quite a bit to get data back, on the order of several hours... not an ideal situation!
Maybe a few optical links with a radio backup would do the trick.
Cheers,
Justin
This is an excellent user land TCP application that automatically re-connects to dropped TCP connections, even if the IP addresses change.
http://www.cs.wisc.edu/~zandy/rocks
There is also an in-depth paper by the authors.
Rocks protect sockets-based applications from network failures, particularly failures common to mobile computing, including:
* Link failures (e.g., unexpected modem disconnection);
* IP address changes (e.g., laptop movement, DHCP lease expiry);
* Extended periods of disconnection (e.g., laptop suspension).
Rock-enabled programs continue to run after any of these events; their broken connections recover automatically, without loss of in-flight data, when connectivity returns. Rocks work transparently with most applications, including SSH clients, X-windows applications, and network service daemons.
bah, slashcode breaks the title attribute in hrefs and co-opts it for it's own use, bad programming.
It is helpful to blind readers and page indexers esp. if the label text is something like 'click here' to provide some information on the content of the link. grr sometimes I gets so mads
There are places where the networks are not touching,and there are places where they are-Boeing's Lori Gunter
We have an Internet-content delivery system that works in a high-latency environment, to deliver mail and web content to South African schools.
http://wizzy.org.za/
The problem it is designed to overcome is the high cost of local telephone calls in a monopoly wireline provider regulatory environment.
We use cheap-rate overnight phone calls and a UUCP delivery system in conjunction with a local mailserver and wwwoffle web cache.
UUCP can also be used via a USB memory stick, similar to the DataMule (pdf) paper referenced on the website. Carrying the memory stick (the Courier) is identical to one UUCP hop.
The website gives more information.
Cheers, Andy!
Andy Rabagliati