Date: Thu, 3 Jun 1999 06:59:18 -0700
To: "Ron Bonica" <rbonica@mci.net>
From: "David A. Guevara" <dguevara@mail.arc.nasa.gov>
Subject: RE: route from hydra-atm1.colorado.edu -> jsimpson-h.gsfc.nasa.gov
Cc: <vbns-eng@mci.net>, <dast@nlanr.net>, <bill@wizard.nasa.atd.net>,
<hammond@solarz.Colorado.EDU>, <sgrant@psc.edu>, <ncne@ncne.org>,
"Kevin Thompson" <kthomp@mci.net>, <mgates@dast.nlanr.net>
Ron --
Looks good to me. Thank you for your help.
-- david
At 7:18 PM -0700 1/1/88, Ron Bonica wrote:
>Folks,
>
>We believe that this problem was corrected last night at about 10PM eastern
>time. Please contact us if you
>have any further problems.
>
> Ron
>
>> -----Original Message-----
>> From: Kevin Thompson [mailto:kthomp@mci.net]
>> Sent: Wednesday, June 02, 1999 9:01 PM
>> To: David A. Guevara; mgates@dast.nlanr.net
>> Cc: vbns-eng@mci.net; dast@nlanr.net; bill@wizard.nasa.atd.net;
>> hammond@solarz.Colorado.EDU; sgrant@psc.edu; ncne@ncne.org
>> Subject: Re: route from hydra-atm1.colorado.edu ->
>> jsimpson-h.gsfc.nasa.gov
>>
>>
>> David, Mark, Anne, and Shirl,
>>
>> We verified the routing problems you reported, and are working to restore
>> several missing ospf adjacancies correlated to our Denver switches.
>>
>> We'll update you in the morning with our progress.
>>
>> Kevin Thompson
>> vBNS Engineering
>> 703-715-7073
>>
>> At 11:02 AM 6/2/99 -0700, David A. Guevara wrote:
>> >mark --
>> >
>> >the last time this connection was "working" was back in late
>> >february, early march. vbns might be able to provide
>> >some input with regards to the additional router in our path.
>> >I'll cc a copy of this message to their engineering group.
>> >
>> >-- david
>> >
>> >At 10:31 AM -0700 6/2/99, Mark Gates wrote:
>> >>Hi Anne and David,
>> >>
>> >>I've been investigating the route that you seem to be using. It is very
>> >>peculiar to me. Do you know what dates you started having problems
>> >>between the machines?
>> >>
>> >>I would say the problem is not congestion but routing. The two things
>> >>that looked odd to me are:
>> >>
>> >> 1) The RTO router that is listed on both traceroutes. RTO is Los
>> >>Angeles, and why your packets would be going through there is a mystery
>> >>to me. They should go directly between Chicago (DNG) and Denver (DNJ)
>> >>routers.
>> >>
>> >> 2) Looking at various round-trip-time and traffic statistics, it seems
>> >>there was a definite change in the network on May 20th, 8am UTC. The
>> >>round-trip-time between Denver and Chicago-based institutions jumped
>> >>from 20ms to 40ms. There doesn't appear to be any traffic going directly
>> >>from the Chicago (DNG) router to the Denver (DNJ) router.
>> >>
>> >>I am going to have the NLANR engineering services group look more at
>> >>this and hopefully discover and fix whatever routing is broken in the
>> >>network. Someone from there may contact you directly if they need more
>> >>information. You may still contact me also.
>> >>
>> >> -mark
>> >>
>> >>
>> >>Anne Hammond wrote:
>> >>>
>> >>> Hi,
>> >>>
>> >>> This message below from David Guevara of NASA NREN
>> >>>
>> >>> Would you be able to help in analyzing this slowdown?
>> >>>
>> >>> Anne M. Hammond Anne.Hammond@Colorado.EDU
>> >>> Network/UNIX Admin 303-492-5578 (FAX -5325)
>> >>> JILA / University of Colorado at Boulder
>> >>> Boulder, CO 80309-0440
>> >>>
>> >>> ----- Begin Included Message -----
>> >>>
>> >>> >From dguevara@mail.arc.nasa.gov Tue Jun 1 08:59:02 1999
>> >>> Mime-Version: 1.0
>> >>> Content-Type: text/plain; charset="us-ascii"
>> >>> Date: Tue, 1 Jun 1999 07:58:54 -0700
>> >>> To: "Anne M. Hammond" <hammond@solarz.Colorado.EDU>
>> >>> From: "David A. Guevara" <dguevara@mail.arc.nasa.gov>
>> >>> Subject: Re: route from hydra-atm1.colorado.edu ->
>> jsimpson-h.gsfc.nasa.gov
>> >>> Cc: bill@wizard.nasa.atd.net, mitchell@jila.Colorado.EDU,
>> >>> litvanyi@spot.Colorado.EDU, hammond@hydra.colorado.edu,
>> >>> brummell@hydra.colorado.edu, dguevara@mail.arc.nasa.gov
>> >>> Content-Length: 1929
>> >>>
>> >>> anne --
>> >>>
>> >>> the route between hydra-atm1 and jsimpson-h is back up. there seems
>> >>> to be a congestion problem. currently our rtt is running about 104ms
>> >>> (approximately twice the value we had at the beginning of
>> this project).
>> >>> I think the problem lies with vBNS. See below for traceroutes from
>> >>> hydra-atm1 and jsimpson-h:
>> >>>
>> >>> hydra <~>traceroute jsimpson-h.gsfc.nasa.gov
>> >>> traceroute to jsimpson-h.gsfc.nasa.gov (169.154.161.43), 30
>> hops max, 40
>> >>> byte pa
>> >>> ckets
>> >>> 1 198.11.22.25 (198.11.22.25) 1 ms 1 ms 1 ms
>> >>> 2 204.131.62.38 (204.131.62.38) 3 ms 3 ms 3 ms
>>
>> >>> 3 cs-atm0-0-14.rto.vbns.net (204.147.130.117) 33 ms 33 ms 33 ms
>> >>> 4 cs-atm0-0-13.dng.vbns.net (204.147.129.145) 81 ms 204 ms 81 ms
>> >>> 5 204.147.128.198 (204.147.128.198) 82 ms 82 ms 83 ms
>> >>> 6 gsfc-chi.nren.nasa.gov (198.10.64.49) 97 ms 97 ms 97 ms
>> >>> 7 192.12.123.42 (192.12.123.42) 98 ms 98 ms 98 ms
>> >>> 8 rtr-900-giga-a.gsfc.nasa.gov (169.154.32.3) 98 ms 98 ms 98 ms
>> >>> 9 * jsimpson-h.gsfc.nasa.gov (169.154.161.43) 100 ms 100 ms
>> >>>
>> >>> jsimpson% /etc/traceroute hydra-atm1.colorado.edu
>> >>> traceroute to hydra-atm1.colorado.edu (198.11.22.12), 30 hops
>> max, 96 byte
>> >>> packe
>> >>> ts
>> >>> 1 169.154.161.1 (169.154.161.1) 6.397 ms 7.808 ms 5.467 ms
>> (6.0/6.000)
>> >>> 2 rtr-atm-a.gsfc.nasa.gov (169.154.1.1) 8.553 ms 8.924 ms
>> 11.023 ms
>> >>> (8.0/9.
>> >>> 000)
>> >>> 3 192.12.123.41 (192.12.123.41) 9.189 ms 5.739 ms 7.83
>> ms (7.0/7.000)
>> >>> 4 chi-gsfc.nren.nasa.gov (198.10.64.50) 20.339 ms 22.183
>> ms 22.424 ms
>> >>> (22.0
>> >>> /21.333)
>> >>> 5 204.147.128.197 (204.147.128.197) 21.977 ms 23.711 ms 23.756 ms
>> >>> (23.0/22.
>> >>> 333)
>> >>> 6 cs-atm0-0-12.rto.vbns.net (204.147.129.146) 69.767 ms 72.649 ms
>> >>> 69.713 ms
>> >>> (69.0/70.000)
>> >>> 7 cs-atm0-0-14.dnj.vbns.net (204.147.130.118) 99.653 ms 101.246 ms
>> >>>105.729
>> >>> ms (101.0/101.667)
>> >>> 8 204.131.62.37 (204.131.62.37) 103.403 ms 106.348 ms 104.908 ms
>> >>> (104.0/104
>> >>> .333)
>> >>> 9 hydra-atm1.Colorado.EDU (198.11.22.12) 103.892 ms 104.416 ms
>> 107.273
>> >>> ms (
>> >>> 104.0/104.667)
>> >>>
>> >>> ----- End Included Message -----
>> >>
>> >>--
>> >>Mark Gates 139 ACB
>> >>NLANR applications support 217-244-7959
>> >>http://www.ncsa.uiuc.edu/People/mgates mgates@nlanr.net
>> >
>>
>>
---End of forwarded mail from "David A. Guevara" <dguevara@mail.arc.nasa.gov>