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Old 02-15-2008, 11:14 AM
Bill Vermillion
 
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Default Re: Very stange tcp/ip problem

In article <8056da43.0311120906.3ce8f0c3@posting.google.com >,
Jim Hickinbotham <aardvark@peaknet.net> wrote:
>Bela Lubkin <belal@sco.com> wrote in message news:<20031112090850.GL14056@sco.com>...
>> When you try to "see" one from the other, are you using IP addresses or
>> host names? If host names, there must be something wrong with host name
>> resolution. One machine is getting a good answer from DNS (or
>> /etc/hosts), the other one isn't.


>> Try `ping -n 192.168.0.1` from 2, and vice versa.


>> >Bela<


>Tried pinging both directions with hostnames and ip's. The Enterprise
>server has repsonses from the Desktop, but not vice versa. Arp does
>occaisionally show the ip of the Ent. on the Desktop, on the Ent. it's
>solid. Makes no sense since I can even telnet and ftp into the Desktop
>from the Enterprise.


>Desktop responds with 'host down' when trying to ping the Ent, from
>either hostname or ip. Stopped and started tcp on both, tried
>rebooting to no avail. Flushed the arp cache, no joy.


I saw something remotely similar when trying to trouble shoot
a T1. We were providing IP and the CLEC was providing transport and
telephones. We looped to my 7513 just fine, the smart jack at my
site, his mid-point, a transition at anohter point, to their
smart-jack and it failed.

All three were on the phone and Max [the telco person] had them
wire a jack as a loopback, and then I could loopback to their hand
but not the Cisco. We said then perhaps you jack is mis-wired.

"We don't have a jack. We just have a 75 foot cable with a plug on
this end and we must moved the connectors over on the 66 block".

The studid fools has cross wired on pair - so things worked in one
direction but not the other.

Check all your cables, connections, etc. The company I was working
with also did convention installs and as a promotional item we
gave out ethernet loopback devices to all customers - complete with
a little light. They loved it, and it saved us more than the cost
of the device.

Since you've checked all the SW I'm thinking it is a wiring issue.

But I could be wrong.

Bill

--
Bill Vermillion - bv @ wjv . com
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