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20041129: IDD feeds from atm.geo.nsf.gov

>From: "Patrick L. Francis" <address@hidden>
>Organization: Bowling Green State University
>Keywords: 200411291316.iATDGZlI028344 IDD

Hi Patrick,

>strange things are afoot at the circle K ...
>
>atm to weather/unidata.bgsu.edu showing monster latencies... internal and 
>oar.net
>connectivity appears OK.
>
>http://my.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?HDS+unidata.bgsu.edu

I looked at all of the feeds you are getting from atm.geo.nsf.gov
(namely, HDS, IDS|DDPLUS, and UNIWISC) and see the exact same latency
signature each one.  The signatures are so consistent, that I am
assuming that your ~ldm/etc/ldmd.conf request line is for 'WMO' and
looks something like:

request WMO     ".*"    atm.geo.nsf.gov

A 'traceroute' from atm.geo.nsf.gov shows a big latency in simple ping
packets:

% traceroute unidata.bgsu.edu
traceroute to unidata.bgsu.edu (129.1.112.220), 30 hops max, 40 byte packets
 1  colima.nsf.gov (198.181.231.1)  12 ms  15 ms  13 ms
 2  arlg-nsf.maxgigapop.net (206.196.177.137)  7 ms  3 ms  7 ms
 3  dcne-so3-0-0.maxgigapop.net (206.196.178.42)  8 ms  15 ms  14 ms
 4  abilene-rtr.maxgigapop.net (206.196.177.2)  7 ms  9 ms  4 ms
 5  nycmng-washng.abilene.ucaid.edu (198.32.8.84)  12 ms  17 ms  14 ms
 6  chinng-nycmng.abilene.ucaid.edu (198.32.8.82)  36 ms  28 ms  27 ms
 7  iplsng-chinng.abilene.ucaid.edu (198.32.8.77)  248 ms  243 ms *
 8  clmbq-r2-po0-0.bb.oar.net (192.88.192.133)  35 ms  34 ms  34 ms
 9  dytnq-r3-at1-0s16.bb.oar.net (192.88.191.101)  37 ms  37 ms  38 ms
10  bgsu2-r1-at2-0s103.cpe.oar.net (192.88.192.174)  60 ms  61 ms  61 ms
11  129.1.8.252 (129.1.8.252)  773 ms  737 ms  711 ms
12  129.1.8.125 (129.1.8.125)  749 ms  806 ms  815 ms
13  * * *
14  * * *
15  unidata.bgsu.edu (129.1.112.220)  858 ms  796 ms  741 ms

The bottleneck appears to be on the BGSU campus:

% awhois 129.1.8.252

OrgName:    Bowling Green State University 
OrgID:      BGSU
Address:    University Computer Services
Address:     Math Science Building
City:       Bowling Green
StateProv:  OH
PostalCode: 43403
Country:    US

NetRange:   129.1.0.0 - 129.1.255.255 
CIDR:       129.1.0.0/16 
NetName:    BGSU
NetHandle:  NET-129-1-0-0-1
Parent:     NET-129-0-0-0-0
NetType:    Direct Assignment
NameServer: NS1.BGSU.EDU
NameServer: NS2.BGSU.EDU
NameServer: NS1.OAR.NET
NameServer: NS2.OAR.NET
Comment:    
RegDate:    1987-06-05
Updated:    2001-01-29

TechHandle: KS770-ARIN
TechName:   Strickland, Kent 
TechPhone:  +1-419-372-2911
TechEmail:  address@hidden 

# ARIN WHOIS database, last updated 2004-11-28 19:10
# Enter ? for additional hints on searching ARIN's WHOIS database.

I would contact your campus network folks and initiate an inquiry
about the large latencies seen with 'traceroute'.  I would also
do a 'traceroute' from unidata.bgsu.edu to atm.geo.nsf.gov to see
if the problem at 129.1.8.252 is bidirectional:

% traceroute atm.geo.nsf.gov

Please let us know the results of your 'traceroute'.

Cheers,

Tom
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