[En-Nut-Discussion] DHCP fix for requesting Gateway and DNS

[Damian Slee]

Hi,
this fixes a problem I was having with ethernut and Win2k DHCP Server, not getting the gateway setting.  Hopefully this change can be added to CVS.

I used Ethereal to look at what a Win2k client sent.  In the DHCP_DISCOVER and DHCP_REQUEST packets a Win2k client was sending a parameter request option.  In the parameter request option, were the parameters Gateway(3), DNS(6) and net mask(1), as well as many others like NetBIOS which we won't worry about.

I added this parameter request option to ethernut's Discover and Request functions.

So I have added to the header file dhcp.h
#define DHCPOPT_PARAMREQUEST 55

Add/Change to dhcpc.c, see attached.  About 12lines of code added.

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