On 12/26/2011 2:23 PM, Randy wrote:
--- On Mon, 12/26/11, Roy<[email protected]> wrote:
From: Roy<[email protected]>
Subject: [c-nsp] Telnet session dropped
To: "[email protected]"<[email protected]>
Date: Monday, December 26, 2011, 1:08 PM
I use RANCID ton a number of
routers. About five days ago, it started failing on
three routers. If I manually connect to these routers,
it seems to work for a minute or so and then the telnet
session gets disconnected. The disconnect only occurs
during a data transfer such as "show conf"
I tested it from several places so the telnet client
doesn't seem to be a factor. The routers are all on
different ISPs and in different cities. The only
common denominator between the failing routers is they are
all set to use a port other than 23. This is done by
natting the external port to port 23 on a null interface.
Rebooting the routers didn't help
Any ideas?
I wonder if your isps have decided to blackhole tcp traffic on port that you
redirect to 23. A quick test to confirm would be to try without port
redirection(terribly insecure) or use ssh. I have been bitten by XO..
./Randy
If they were blackholing traffic then I would think I couldn't even get
connected in the first place
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