Diagnosing TCP connecitivy issues when performing satellite-sync or yum

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When there an agent in the middle of the TCP conversation, some things gets changed, some footprints are left behind. Tracking them will leads us to the acting agent.
One main way to identify proxies on local network is to compare ping latency values against a direct connection one. Like this:

$ ping satellite.rhn.redhat.com -c 3
PING sate...

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