This option allows you to fine-tune your performance a little. This requires Administrative user rights, and on most operating systems also requires a helper library. TCP is the protocol used for all web browsers in addition to FTP, Telnet and others. If a firewall is blocking ICMP packets, it’s sometimes possible to get a response using TCP packets instead. This method gives you the opportunity to send TCP packets. This requires administrative rights, and doesn't work reliably on Windows Vista or newer (including Windows 8). Though not the cure-all for "Destination Unreachable" issues, this is worth a try, especially if you’re getting erratic packet loss or unreachable destination. This method will sometimes allow you to trace to a destination that isn’t reachable via ICMP, or might allow you to reach the internet even if your ISP is blocking ICMP echo requests. This uses ports 33434 – 33500 and closely mirrors Unix’s traceroute command. PingPlotter can compose its own ICMP packets - although in most cases this is no more reliable or better than ICMP.DLL. In some rare cases, the standard Windows method doesn't work.
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