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I suspect my ISP is using a proxy server, though I cannot prove it. The only evidence I've got is that incoming packets have a very high TTL > 254.

Is there a way to check it out, without calling my ISP (I don't trust the call-center to have the right answer for that kind of question)?

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up vote 1 down vote accepted

See Proxy Test. A quote from the page:

The Lagado Proxy Test shows details of any proxy servers you are using. It is especially useful to expose transparent proxies. These are proxies inserted between your browser and the web, typically by your ISP, and often without you knowing.

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Excellent, thanks! –  nadiv Sep 6 '09 at 14:59
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