DHCP服务器总是分配子网掩码255.255.0.0如何更改？

请原谅，如果我在某处被问到，我使用的是TCP IP堆栈V5.42.08设备PIC24FJ256+Enc28。当我启用DHCP服务器，然后将板连接到我的PC（直接到以太网端口）时，它总是给我的PC分配IP地址169254.0.100和子网掩码255.255.0.0。我想要DHCP服务器屁股。我的子网掩码255.255.255.0，我如何改变？我在文件“DHCPS.C′：//选项：子网掩码UPDPT（DHCPA子网掩码））中，在DHCP子网掩码中定义了“DHCP .H”：*定义DHCPA-子网掩码（1U）//DHCP1子网掩码类型，这是我必须更改的部分吗？是否将其更改为（0U）或（2U）以获得子网掩码255.255.255.0？



      以下为原文

    Pardon me if this has been asked somewhere,
I'm using TCP IP Stack v5.42.08
Device PIC24FJ256 + ENC28.

When I enabled DHCP server then connect the board to my PC (directly to the ethernet port), it always assign my PC with IP address 169.254.0.100 and subnet mask 255.255.0.0.
I want the DHCP server assign me subnet mask 255.255.255.0 instead, how do I change that?
I found in file 'DHCPs.c':
      // Option: Subnet Mask
    UDPPut(DHCP_SUBNET_MASK);

Where DHCP_SUBNET_MASK is defined in 'DHCP.h':
    #define DHCP_SUBNET_MASK                (1u)    // DHCP_SUBNET_MASK Type

Is this the part that I must change? Do I change it to (0u) or (2u) to obtain subnet mask 255.255.255.0?