Open Relay box???

[Duncan]

i have a client who has an active linux box on dial up .Imagine he has disconnected his box from the LAN network , stopped squid but still i get very high ping rates and suddenly low ping rates wen i ping him .He is using 194.168 range of ip's in his LAN . Does this put him on open relay ,and wat accounts for such varying traffic flows.
My head is cracking. Appreciate yo help 

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Duncan Rack