The match, arranged as part of the deal that saw Palace sign Dave Martin last season, was played in front of a sell-out crowd at Dartford's Princes Park ground.
It took just 16 minutes for the Eagles to open the scoring, with Carl Fletcher getting the opener.
The scoreline remained the same at half time, when boss Peter Taylor took the opportunity to make widespread changes to the line up.
After nine minutes of the second half the lead was doubled, as Green notched his second goal of pre-season. The scoreline was complete when Ifill knocked one in late on.
First half:
Flinders, Butterfield, Hudson, Swaibu, Hills, Grabban, Soares, Fletcher, Moses, Freedman, Kuqi
Second Half:
Speroni, Lawrence, Cort, Swaibu, Craig, Green, Watson, Bostock, Martin, Scowcroft, Ifill