PXE-E51 No DHCP server

Im attempting to install Windows 7 in my Netbook (Asus 1005HA) from my Notebook (Asus N53JF) using TFTPBOOT.
I was getting the error "PXE-E51 No DHCP server" after setting up the TFTPBOOT following this guide.
Finally i found out that increasing the timeout in the settings from 3 secconds to 15 solved the issue.