Defense Mod is all about defending your base from mobs and even other players. You can craft chainlink fences, which are cheaper than iron bars, but are climbable. To solve this, you can also craft barbed wire, and razor wire to place on top. These are also climbable, but they’ll do significant damage to anything that tries to do so (razor wire is more expensive, but does more damage). You can also craft sandbags, which are somewhat explosion resistant. As a bonus, Defense adds a recipie for vanilla chainmail armour.
Defense Mod Screenshots:
Defense Mod Installation
Like any other Forge mod, simply place them in your .minecraft/mods/ folder.
[download]Defense-Mod-1.5.2.zip (23 KB)[/download]
[download]Defense-Mod-1.6.2.zip (28 KB)[/download]
Source: Minecraft forum