SUMMARY: Flaky Network Connection

From: Rasana Atreya (atreya@library.ucsf.edu)
Date: Mon May 19 1997 - 16:37:24 CDT


Hi Managers,

My original post:

>I've been having this problem for 6 weeks now, and I've not been able to
>track it down.
>
>- My Sparc 2, Solaris 2.5 has flaky connection to machines on the subnet. This
>problem is intermittent. All of a sudden, an rsh/telnet/whatever session to a
>remote machine freezes. I cannot even ping the remote machine. Then after a
>while one of 3 things might happen: it comes back, is desparately slow, or the
>connection terminates, with the following message:
> Remote machine's connection closed with error:
> Read error from network: Connection timed out
>
>- I added static routing via /etc/defaultouter to the router. Did not help.
>
>Sun support suggested I add patches to my system. So this is the complete
>list of patches that I have:
>
>Patch: 103060-05 Obsoletes: 103066-01, 103230-05 Packages: SUNWcsu,
>SUNWarc, SUNWnisu
>Patch: 103187-11 Obsoletes: 103060-05, 103066-01, 103230-05, Requires:,
>Incompatibles: Packages: SUNWcsu, SUNWarc, SUNWnisu
>Patch: 103164-06 Obsoletes: , Requires:, Incompatibles: Packages: SUNWcsu
>Patch: 103169-10 Obsoletes: , Requires:, Incompatibles: Packages: SUNWcsu,
>SUNWcsr
>Patch: 103468-02 Obsoletes: Packages: SUNWcsu
>Patch: 103093-08 Obsoletes: 103084-02, 103489-01, 103325-03, Requires:,
>Incompatibles: Packages: SUNWcsr, SUNWcar
>Patch: 103244-03 Obsoletes: Packages: SUNWcsr, SUNWhea
>Patch: 103447-07 Obsoletes: , Requires:, Incompatibles: Packages: SUNWcsr
>Patch: 102979-02 Obsoletes: 103026-01 Packages: SUNWcsr
>Patch: 103318-01 Obsoletes: Packages: SUNWcsr
>Patch: 103441-02 Obsoletes: , Requires:, Incompatibles: Packages: SUNWcsr
>Patch: 103477-07 Obsoletes: 103226-07, Requires:, Incompatibles: Packages:
>SUNWcsr
>Patch: 103021-02 Obsoletes: Packages: SUNWcar
>Patch: 103210-11 Obsoletes: , Requires:, Incompatibles: Packages:
>SUNWxwplt, SUNWxwslb
>Patch: 103210-14 Obsoletes: , Requires:, Incompatibles: Packages:
>SUNWxwplt, SUNWxwslb

My problem was indeed a faulty ethernet port. I'm including all responses in
the hope that they might help someone else.

Thanks to everyone that replied!

Rasana

---------------------------------------------------------------------------
From: "Andrew Moffat" <amof@SubaruSparcDev.subaru1.com>
From: (Bill) Sun System Admin <sysadm@its.brooklyn.cuny.edu>

- Warned me that my password in the truss output I sent out was in plain text.

---------------------------------------------------------------------------
From: "Karl E. Vogel" <vogelke@c17mis.region2.wpafb.af.mil>

   Have you tried running "snoop" on your network from either your machine or
   another Sun when this starts happening?

---------------------------------------------------------------------------
From: "Ricardo Ferraro G. da Silva" <rferraro@ci.rnp.br>

Hi Rasana,

 What is the model of your router ?

 How are your splitting your networks (subnetting) ?

 Are you using PPP link to the outside world ?
---------------------------------------------------------------------------
From: "Ravindra N Nemlekar" <ravindra@airmail.hobl.lucent.com>

Seems to be a bad network port. Try replacing the motherboard
if possible. Alternatively, you can add another network
card and check if everything works fine using that one.

---------------------------------------------------------------------------
From: Glenn Satchell - Uniq Professional Services <Glenn.Satchell@uniq.com.au>

Sounds like hardware problems to me. Try swapping ethernet
transceiver and cables with known good ones and see if the
problem persists. If th ehub supports it check for errors on the
port at the hub which may be caused by cables or transceiver.

---------------------------------------------------------------------------
From: Ric Anderson <ric@rtd.com>

What's your net topology? This could be a a bad cable or wall jack,
or a bad connection or hub port if you are using twisted pair, or an
improperly attached connector or terminator if you are using thin
wire ethernet, or it could be network traffic load related.

I nearly went nuts with this set of symptoms in my office,
until we found a nicked wire in the wall jack. However,
finding this took a Fluke DSP cable scanner, which not everyone
has :-(

---------------------------------------------------------------------------
From: "Rick von Richter" <rickv@mwh.com>

A couple of things to check,

1) It sounds like a bad NIC card. If you have a spare lying around (everyione
does don't they 8-) ) you can toss it in and see if anything changes.

2) See if the system you a logging into is not trying to automount a
non-existent system. This would cause a definate slowdown but shouldn't bump
your connection.

---------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~ Rasana Atreya Voice: (415) 476-3623 ~
~ System Administrator Fax: (415) 476-4653 ~
~ Library & Ctr for Knowledge Mgmt, Univ. of California at San Francisco ~
~ 530 Parnassus Ave, Box 0840, San Francisco, CA 94143-0840 ~
~ atreya@library.ucsf.edu ~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



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