[Tfug] ftp question

ewf erich at dakotacom.net
Fri Oct 15 10:43:25 MST 2004


Jim Secan wrote:

>I routinely download small files from a site in Colorado a couple of times
>an hour from a collection of automated scripts.  Normally things work just
>fine, but for some reason yesterday things broke down.  When I chased it
>all down, my firewall was rejecting packets coming in from the target
>machine to my machine at various high ports (59000+)
>
      This is a digression from the topic, but a 5-digit port number 
makes me blink. The higest
I've seen is 6000 which  corresponds to x11. My firewall rejects any 
external service port number
higher than 1023.

                                                                        
                                                                        
 Erich

> which broke the ftp
>link.  I've had speculation that these packets to high ports are part of
>the ftp process post-negotiation and that what I'm seeing is problems that
>might be due to increased latency or message-order shuffling or some other
>phenomenon between my firewall and the target machine.  When I did a
>traceroute, the route was about 12 hops longer than usual and was highly
>variable.  Today the traceroute shows what I consider to be the normal
>routing and I'm not having problems.
>
>Does this make sense?
>
>TIA
>Jim
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