No it is not possible to test different DNS servers using SilkPerformer. Although it is possible to use SilkPerformer to assign IP addresses to multiple NIC"s; it is however not possible to combine this method with the NIC"s "Preferred DNS server" to test individual DNS servers. This was tested using a network sniff tool to verify which DNS was being used by which IP address. In testing this outside of SilkPerformer using two NIC"s, we have been able to verify that Network Adapter #2 used the DNS of Network Adapter #1. This behaviour occurs because the routing is controlled by the DNS resolution algorithm of Windows; therefore despite which IP address is used, Windows will use whichever method resolves the DNS query fastest hence the wording "Preferred DNS Server" For information about the route used when testing this see: Windows XP TechCente Route Command Old KB# 20379
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