They used to be available on the Microsoft ftp site here. you might give it a try.
ftp://ftp.microsoft.com/bussys/Clients/MS...IENT/dsk3-2.exe
ftp://ftp.microsoft.com/bussys/Clients/MS...IENT/dsk3-1.exe
[*]The Microsoft LAN Manager Client for DOS
ftp://ftp.microsoft.com/bussys/Clients/la...nman/DSK3-1.EXE
ftp://ftp.microsoft.com/bussys/Clients/la...nman/DSK3-2.EXE
ftp://ftp.microsoft.com/bussys/Clients/la...nman/DSK3-3.EXE
ftp://ftp.microsoft.com/bussys/Clients/la...nman/DSK3-4.EXE
[*]Microsoft LAN Manager 2.2c Client for DOS
ftp://ftp.microsoft.com/BusSys/Clients/LANMAN.DOS/
[*]NetWare DOS Client, NetWare Client for DOS workstations. FREE from Novell.
http://www.novell.com/coolsolutions/tools/1066.html
[*]Internet Extender is a project Gateway/Router in DOS. as ICS (Internet Connection Sharing) via/for DOS.
http://www-acc.scu.edu/~jsarich/ieweb/main.htm