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troubleshooting Question

troubleshooting dropped ftp connection via a leased line with Cisco routers

Avatar of sunhux
sunhux asked on
RoutersLinux NetworkingNetwork Management
12 Comments1 Solution945 ViewsLast Modified:

I have a point to point leased circuit link : both ends are Cisco 25xx routers.

Files transfer is initiated (put & get) from my end (a Linux) to a remote
Windows box (no other boxes at both ends can do files transfer :
restricted by routing / firewalls)

I've been facing intermittent ftp connection drops while a files transfer
is in progress & MRTG showed occasional bandwidth spikes that could
approach the max bandwidth.

Assuming I have no control over the remote end's cisco router & the
remote end Windows box, what's the best way to troubleshoot this?

a)I thought of running Linux "iftop" continuously on my Linux box to
   see what kind of traffic is passing thru the link

b)what about mirroring a port on the switch which the cisco router at
   my end connects its sole LAN link to?  How do I configure this 36xx
   cisco switch port for mirroring & how do I capture its traffic

What other things I can do narrow down this occasional "ftp connection
closed" in the midst of a files transfer (weirdly it can happen at 4am when
I don't expect much traffic) & the occasional spikes.

Would "show interface" on the cisco router reveal bad Telco links issue ?
Avatar of sunhux

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