my D3100 on macOS lan problem

[cyrus]

i use new macbook pro on macOS 10.12.1
installed DisplayLink Software Installer.pkg
reboot macOS and my lan show can't get DHCP

i ask apple support say is lan drive problem

i find lan info on system report

Dell USB3.0 Dock：

Type : USB
Name : en1
Kext name： AppleUSBNCM.kext
Position： /System/Library/Extensions/AppleUSBNCM.kext
version： 5.0.0

the driver kext is use appleusbncm.kext

i know this is wrong kext

DisplayLink LAN is use displaylinkethernetdriver.kext

but way installer not have displaylinkethernetdriver.kext on system?

My system Other kext only have

Cyrus$ ls /Library/Extensions/
ACS6x.kext DuetDisplay.kext
ATTOCelerityFC8.kext HighPointIOP.kext
ATTOExpressSASHBA2.kext HighPointRR.kext
ATTOExpressSASRAID2.kext PromiseSTEX.kext
ArcMSR.kext SoftRAID.kext
CalDigitHDProDrv.kext ufsd_NTFS.kext
DisplayLinkDriver.kext