I have about a gigbyte of ram and trying to install approximately 28000 rules. I'm getting "iptables: Memory allocation problem" error. Is this because i don't have enough ram. Is there a formula or rule of thumb to calculate how much ram is needed for a certain number of rules. Jay Zorzi Systems Administrator, Information Technology MarketLink Solutions see further. achieve more. e - jzorzi@xxxxxxxxxxxxxxxxxxxxxxx t - 416.260.2800 x299 f - 416.260.2893