ndd doesn't run on Soalris x86 but on soalris, no x86 driver can be interfaced via ndd. The only way to set speed/duplex is via the NIC's driver.conf. iprb on Solaris 8 suggests that you can specify speed/duplex for multiple instances via ForceSpeedDuplex option. For other drivers, you'll need to specify each instance per driver.conf. Finally, auto-negotiating works in most cases as expected. Having to hard-code values may indicate cabling or switch problems.
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