nanog mailing list archives
Re: UUNET issues?
From: "Steven M. Bellovin" <smb () cs columbia edu>
Date: Sun, 5 Nov 2006 15:28:44 -0500
On Sun, 05 Nov 2006 07:16:07 -0800, Stephen Satchell <list () satchell net> wrote:
David Lesher wrote:Speaking on Deep Background, the Press Secretary whispered:On Nov 5, 2006, at 1:51 AM, Randy Bush wrote:"Could you be any less descriptive of the problem you are seeing?"the internet is broken. anyone know why?Did you ping it?is that what broke it?I'm sure it just needs to be rebooted.Is this the day we disconnect everything and blow all the dirt out?You only *think* you are joking. I still remember the Day of the Great Restart when everyone on the ARPAnet had to shut down the IMPs and TIPs, and reload the control software. Why? There were literally thousands of rogue packets flying around the net, eating up bandwidth (and in those days, we are talking 56 kbps links!) and boy were those tubie-thingies plugged up! Shortly after that cusp event, per-packet TTL field was added to the NTP protocol, which is why TCP/IP has the TTL field in the IP packet.
I assume you mean NCP rather than NTP. Anyway, I don't think that would have helped if you're talking about the same incident I'm thinking of. There were application-level retransmissions of (corrupted) packets, complete with building new bad packets from bad data structures, all over the net The problem is documented in RFC 789 It and "The Bug Heard 'Round the World" are two of my favorite "how complex systems fail" papers; all system designers should read, memorize, and undertand both.
The network had added to it a self-cleaning function. Think of it as one long continuous sneeze.
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb
Current thread:
- Re: UUNET issues?, (continued)
- Re: UUNET issues? Randy Bush (Nov 04)
- Re: UUNET issues? Matthew Petach (Nov 04)
- Re: UUNET issues? Mark Smith (Nov 04)
- Re: UUNET issues? Michael Smith (Nov 04)
- Re: UUNET issues? Randy Bush (Nov 04)
- Re: UUNET issues? Michael Smith (Nov 04)
- Re: UUNET issues? Mark Smith (Nov 04)
- Re: UUNET issues? Marshall Eubanks (Nov 05)
- Re: UUNET issues? David Lesher (Nov 05)
- Re: UUNET issues? Stephen Satchell (Nov 05)
- Re: UUNET issues? Steven M. Bellovin (Nov 05)
- Re: UUNET issues? Donald Stahl (Nov 05)
- Re: UUNET issues? Donald Stahl (Nov 05)
- Router Options & Support Experiences Donald Stahl (Nov 08)
- Re: UUNET issues? nealr (Nov 04)
- Re: UUNET issues? bmanning (Nov 05)
- RE: UUNET issues? Ed Ray (Nov 05)