Subject: Re: Network data corruption, (Was Re: sup problems for
To: None <adm@demon.net, current-users@NetBSD.ORG>
From: Peter Kline <peter@agis.net>
List: current-users
Date: 01/01/1996 21:00:07
At 10:15 PM 1/1/96 +0000, Neil J. McRae wrote:
>> 
>> there's definitely _something_ wrong with ftp.netbsd.org's network
>> connection.  try:
>> 
>> 	ping -p 00000000ffffffff ftp.netbsd.org
>> 
>> for an example.  (i see the same problem pinging from CMU, Berkeley,
>> and MIT, so it can't be all on my end.  8-)
>> 
>> I dunno whose fault it is, though...
>> 
>I believe there to be a fault on agis/net99 (They are one in the same I
>believe) line at some point, before netbsd.warped.com

Net99 is a majority owned subsidiary of AGIS.  The networks are very
definitely separate.  Net99 has 3Mb frame relay and 10Mb atm connections
(delivered as ethernet) between the 2 major routers at MAE East and MAE
West, with various other cities on one of the two nets.  AGIS is a DS3 ATM
network with major routing sites in Washington DC (MAE-East), Pennsauken
(Sprint NAP), Detroit, Chicago (AADS NAP, MAE-Chicago soon), San Francisco
(CIX/SMDS, PacBell NAP, MAE-West), Los Angeles (MAE-LA if it happens).
Other sites include Seattle, San Diego, New York, Boston, Philadelphia, and
Dallas (MAE-Dallas if it happens).  AGIS and Net99 are interconnected at
MAE-East and MAE-West just as they were before the purchase.  Since the
purchase, no additional customers have been added to the Net99 net, but as
existing Net99 customers grow, the net has become increasingly loaded,
perhaps contributing to the problem we're discussing here.

>
>We are an Agis Customer:
>/usr/home/neil:neil@doublesix>traceroute 204.157.38.2
>traceroute to 204.157.38.2 (204.157.38.2), 30 hops max, 40 byte packets
> 1  router (194.159.101.129)  5.337 ms  5.428 ms  3.754 ms
> 2  domino-gw.access.demon.net (158.152.1.179)  26.934 ms  22.548 ms  20.81 ms
> 3  trude-servers.router.demon.net (158.152.1.99)  28.874 ms  24.722 ms
38.923 ms
> 4  telehouse-1.router.demon.net (194.159.252.51)  66.886 ms  57.749 ms
35.507 ms
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     Demon London

> 5  agis-demon.washington.agis.net (205.137.59.57)  498.652 ms  499.083 ms
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     AGIS Washington DC

> 6  * Net99-Mae-East01.net99.net (192.41.177.170)  394.944 ms  392.512 ms
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     Net99 at MAE-East

> 7  sj-0.SanJose.net99.net (204.157.38.2)  509.928 ms  463.205 ms *
     ^^^^^^^^^^^^^^^^^^^^^^
     Net99 at MAE-West

>
>/usr/home/neil:neil@doublesix>ping -p 00000000ffffffff 204.157.38.2
>PATTERN: 0x00000000ffffffff
>PING 204.157.38.2 (204.157.38.2): 56 data bytes
>64 bytes from 204.157.38.2: icmp_seq=1 ttl=246 time=530.132 ms
>wrong data byte #32 should be 0x0 but was 0xff
>        30 e8 5a a1 0 e ec d6 0 0 0 0 ff ff ff ff 0 0 0 0 ff ff ff ff ff ff
>ff ff ff ff ff ff 
>		0 0 0 0 ff ff ff ff ff ff ff ff ff ff ff ff 
>64 bytes from 204.157.38.2: icmp_seq=2 ttl=246 time=347.319 ms
>wrong data byte #32 should be 0x0 but was 0xff
>        30 e8 5a a2 0 e ee e9 0 0 0 0 ff ff ff ff 0 0 0 0 ff ff ff ff ff ff
>ff ff ff ff ff ff
>		0 0 0 0 ff ff ff ff ff ff ff ff ff ff ff ff 
>64 bytes from 204.157.38.2: icmp_seq=3 ttl=246 time=270.397 ms
>wrong data byte #32 should be 0x0 but was 0xff
>        30 e8 5a a3 0 e ed e 0 0 0 0 ff ff ff ff 0 0 0 0 ff ff ff ff ff ff
>ff ff ff ff ff ff 
>        0 0 0 0 ff ff ff ff ff ff ff ff ff ff ff ff 
>^?
>--- 204.157.38.2 ping statistics ---
>4 packets transmitted, 3 packets received, 25% packet loss
>round-trip min/avg/max = 270.397/382.616/530.132 ms
>
>Peter or Mark at agis, are you aware of this? Can you let us know whats
>going on?

Yes, we're aware.  However, I've been trying all day to duplicate the
problem and can't do it (i.e. using the ping above to ftp.netbsd.org).
Net99 seems to be running a little light on load, so maybe tomorrow with
normal conditions would be better.  Besides, MFS Datanet is running skeleton
until then. 

This may prove fairly difficult/time consuming to resolve.  But we'll be
looking at it.


_____________________________________________________________________
Peter Kline  Senior Network Engineer|               pots 313-730-1130
AGIS - Internet Backbone Services   |              pager 800-823-7118
22015 West Outer Drive              |Fear is what you know about
Dearborn, MI  48124                 |   yourself -- me
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