[ale] can anyone explain this?

Dow Hurst dhurst at kennesaw.edu
Mon Dec 17 11:54:58 EST 2001


Chris,
I love these problems since you learn so much from them!

Run a traceroute on your linux box to your companies nameserver.  You
will probably see a strange route compared to your win boxes route.  Are
your win box and linux box configured with the same DNS server entries? 
You use your ISP's DNS servers right?  Which domain's are you searching
in /etc/resolv.conf?  You may find that your linux box has been set with
a gateway that isn't the right IP.  Your linux and win boxes should
point to the inside interface of your local linux router.  The linux
router should forward packets it doesn't know what to do with to it's
gateway which is the nearest router in your ISP.  That could have gotten
hardcoded to an incorrect value at some point.  It definitely looks to
me like the linux box is traveling thru a longer route with more traffic
to get to your companies DNS than your win box is.  Send us the
traceroute output, the output of ifconfig -a, the output of netstat -rn,
and your values in /etc/resolv.conf.  Also, match that with the settings
in winipcfg from your win box.  You might see the problem just from
doing that.  Lastly, do you have a high network load on your linux box? 
Is it streaming video or MP3's over the local LAN?
Dow


Christopher Bergeron wrote:
> 
> I have a few boxen on my internal home network (192.168.0.x); among them are
> a few linux boxes and 1 lowly win 2k box.
> 
> Here's the inconceiveable part:  My work domain:  bass-associates.com just
> recently changed Network Solutions DNS entries to point at _our_ work DNS
> server.  Now, when I try to ping my work domain from my win box at
> home(which gateways out of a linux box) I get this:
> ----------------------------------------------------------------------------
> ---------
> C:\>time
> The current time is: 23:11:26.29
> Enter the new time:
> 
> C:\>ping www.bass-associates.com
> 
> Pinging www.bass-associates.com [12.108.240.165] with 32 bytes of data:
> 
> Reply from 12.108.240.165: bytes=32 time=40ms TTL=241
> Reply from 12.108.240.165: bytes=32 time=30ms TTL=241
> Reply from 12.108.240.165: bytes=32 time=30ms TTL=241
> Reply from 12.108.240.165: bytes=32 time=30ms TTL=241
> 
> Ping statistics for 12.108.240.165:
>     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
> Approximate round trip times in milli-seconds:
>     Minimum = 30ms, Maximum =  40ms, Average =  32ms
> ----------------------------------------------------------------------------
> ----------
> Yet from my linux box (the gateway for the winbox), I get this:
> 
> [root at proto1 /]# date; ping www.bass-associates.com -c 3
> Fri Dec 14 23:01:30 EST 2001
> PING www.bass-associates.com (12.108.240.165) from 24.98.82.217 : 56(84)
> bytes of data.
> 
> --- www.bass-associates.com ping statistics ---
> 3 packets transmitted, 1 packets received, 66% packet loss
> round-trip min/avg/max/mdev = 74.240/74.240/74.240/0.000 ms
> ----------------------------------------------------------------------------
> ------------
> 
> The linux box(gateway) is getting 66% packet loss, and the win box isn't!!!
> DoH!!!
> Has the win box somehow gotten more accurate(/recent) DNS info?  The linux
> box (gateway) has it's clock set daily to the National Observatory / Naval
> Atomic Clock so it's the accurate one.   I use the win2k box to browse, but
> I use the linux for everything else [pron: important].  Could the winbox
> have gotten DNS info from sites it browses to or something?  When I ping by
> IP address, I get fast response time from _both_ machines.
> 
> This whole thing has me absolutely befuddled...
> Does anyone have any clues/ideas/suggestions about what is going on?
> 
> Much respect in advance!
> CB
> 
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-- 
__________________________________________________________
Dow Hurst                   Office: 770-499-3428
Systems Support Specialist  Fax:    770-423-6744
1000 Chastain Rd.
Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
*********************************
*Computational Chemistry is fun!*
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