Re: the O(N^2) problem

2008-04-13 Thread David Andersen
Another alternative is something we've been working on that we call Perspectives: http://www.cs.cmu.edu/~dwendlan/perspectives/ Warning: This is a work in progress. The Mozilla plugin is a little flaky and the paper is still being revised for the final revision for USENIX. The SSH

Re: Does TCP Need an Overhaul? (internetevolution, via slashdot)

2008-04-05 Thread David Andersen
On Apr 5, 2008, at 9:40 AM, Kevin Day wrote: in answer to your question about SACK, it looks like they simulate a slower link speed for all TCP sessions that they guess are in the same flow-bundle. thus, all sessions in that flow-bundle see a single shared contributed bandwidth-delay

Internet access in Japan (was Re: BitTorrent swarms have a deadly bite on broadband nets)

2007-10-22 Thread David Andersen
On Oct 22, 2007, at 9:55 PM, Leo Bicknell wrote: Having now seen the cable issue described in technical detail over and over, I have a question. At the most recent Nanog several people talked about 100Mbps symmetric access in Japan for $40 US. This leads me to two questions: 1) Is that

Re: Internet access in Japan (was Re: BitTorrent swarms have a deadly bite on broadband nets)

2007-10-22 Thread David Andersen
On Oct 22, 2007, at 11:02 PM, Jeff Shultz wrote: David Andersen wrote: http://www.washingtonpost.com/wp-dyn/content/article/2007/08/28/ AR2007082801990.html snip Followed by a recent explosion in fiber-to-the-home buildout by NTT. About 8.8 million Japanese homes have fiber lines

Re: ISP wants to stop outgoing web based spam

2006-08-09 Thread David Andersen
On Aug 9, 2006, at 2:15 PM, Barry Shein wrote: I think what was being talked about was that a lot of spam now comes as embedded images which unpack into ads for the usual stuff. It's actually been going on for a few years but I guess as the other stuff gets more and more effectively blocked

Re: BGP data needed

2006-05-03 Thread David Andersen
You can find the feeds we (myself and Nick Feamster) collect at the RON testbed at http://www.datapository.net/data/ (the two subdirs - bgpup and bgptables - should be fairly self- explanatory.) Note that some of the data we have in there is Abilene routing data. While we have a

Re: Determine difference between 2 BGP feeds

2006-04-18 Thread David Andersen
Much of what Bill described below is already present using Nick Feamster's bgptools release: http://nms.lcs.mit.edu/software/bgp/ bgptools/ Start with zebra / quagga / etc., which do a great job of dumping tables and updates. Then use bgptools to take the MRT-formatted dumps that Zebra

Re: multi homing pressure

2005-10-20 Thread David Andersen
On Oct 20, 2005, at 5:37 AM, [EMAIL PROTECTED] wrote: http://nms.lcs.mit.edu/ron/ronweb/#code (Part of my thesis work, Hehe, google for vixie ifdefault. Paul's use of Squid is mentioned in this NANOG posting: http://www.cctec.com/maillists/nanog/historical/9702/msg00431.html Here are

Re: Network Map Generator

2005-09-26 Thread David Andersen
On Sep 26, 2005, at 3:59 PM, Joe Johnson wrote: I'm looking for a product or script that will let us generate a network map for use in conjunction with Nagios. We have all of the parent/child dependencies defined in a SQL table, as well as the current status, but I can only find

Re: SNMP tool summrizing multiple interfaces traffic data

2005-08-26 Thread David Andersen
Most of them. Cricket makes it easy to specify interface A + ... + interface N, for instance. -Dave On Aug 26, 2005, at 4:32 AM, Joe Shen wrote: Hi, Beside monitoring in/out traffic on each egress links, is there a tool which could provide a summary bandwidth utilization on two or

Re: mh (RE: OMB: IPv6 by June 2008)

2005-07-08 Thread David Andersen
On Jul 8, 2005, at 12:49 PM, Jay R. Ashworth wrote: On Thu, Jul 07, 2005 at 01:31:57PM -0700, Crist Clark wrote: And if you still want the protection of NAT, any stateful firewall will do it. That seems a common viewpoint. I believe the very existence of the Ping Of Death rebuts it. A

Re: mh (RE: OMB: IPv6 by June 2008)

2005-07-07 Thread David Andersen
On Jul 7, 2005, at 1:09 PM, Kuhtz, Christian wrote: As an easy-to-read overview of the shim6 approach, the following rough draft may be useful: http://www.ietf.org/internet-drafts/draft-ietf-shim6-arch-00.txt Thanks, I'm fully aware of where shim6 is right now. I'm asking if anyone

Re: mh (RE: OMB: IPv6 by June 2008)

2005-07-07 Thread David Andersen
On Jul 7, 2005, at 3:41 PM, Andre Oppermann wrote: Fergie (Paul Ferguson) wrote: I'd have to counter with the assumption that NATs are going away with v6 is a rather risky assumption. Or perhaps I misunderstood your point... There is one thing often overlooked with regard to NAT. That

Re: OT? /dev/null 5.1.1 email

2005-07-05 Thread David Andersen
On Jul 5, 2005, at 11:28 PM, Steven M. Bellovin wrote: In message [EMAIL PROTECTED], Todd Vierling writes: The default recommendation I give anyone these days is to use no secondaries, and let the sender's mail server queue it up, as that's the fastest implementation path. As a second

Re: Fundamental changes to Internet architecture

2005-07-01 Thread David Andersen
On Jul 1, 2005, at 9:40 AM, Eric Gauthier wrote: Dave Clark is proposing that the NSF should fund a new demonstration network that implements a fundamentally new architecture at many levels. Not that I want to throw any more fire on this, but I think the article is talking about National

Re: Resilience: faults, causes, statistics, open issues

2005-01-28 Thread David Andersen
On Jan 28, 2005, at 5:30 AM, András Császár (IJ/ETH) wrote: Just some comments about the root causes of BGP related problems, maybe you find something useful from the research perspective, although probably this is not going to be new for you. I found a few author groups with very related and