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I have a ping to which varies between 1 and 23 milliseconds. I'm using a VIA Rhine II Fast Ethernet Adapter, and updating to the latest driver version didn't seem to fix the problem.

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what OS? I wouldn't thing a ping to localhost would go out to the ethernet adaptor. And why is ping to localhost important here? – Journeyman Geek Nov 5 '12 at 0:50
Windows XP SP3. This seems to delay every connection I make. For example, from another computer ping to my router is <1ms, but from this computer the ping to my router highly varies in the same way the ping to my own computer varies. I'm not using wireless... – sdf Nov 5 '12 at 0:52
try reinstalling the tcpip stack. – Moab Nov 5 '12 at 0:56
Is routed via the loopback interface (as it should be)? If it is then it should never reach (or be influenced by) your network card and NIC drivers. – Hennes Nov 5 '12 at 1:13
Post output to trace-route of . See – Mikhail Nov 5 '12 at 1:26

It sounds like you might have a service running locally that might be producing this behavior. That is the only thing I have ever seen that would cause a response from localhost to exceed <1ms.

Do this:

  1. close all web browsers, bit torrent clients, anything that might be making a network connection.
  2. open a terminal or command prompt (not sure if you are using Windows or Linux)

In Windows

netstat -an | findstr

in Linux

netstat -an | grep

take a look at any connections that are ESTABLISHED or LISTENING.

Some common services to look for would be HTTP (80), Socks Proxy (8080, 8000, etc), SQL Server (1433), Webmin (10000), MySQL (3306).

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