The LD50 of nicotine is 50 mg/kg for rats and 3 mg/kg for mice. 0.5-1.0 mg/kg can be a lethal dosage for adult humans, and 0.1 mg/kg for children.
IPSec is a suite of protocols that provide security services at IP layer of TCP/IP stack i.e. Network Layer in OSI model. As Andy Lemke mentioned, IPSec suite comprises of two protocols to offer security to. 1. AH - Authentication Header Protocol.(Protocol no: 51) 2. ESP - Encapsulation of security payload Protocol.
Normally this Internet Protocol Security or IPSec is a system that is applied in the VPN. This Virtual Private Network is a process to increase the security of internet by hiding the ip address and also hiding the original identity.ut most of the VPN use this Ipsec. Because it can in any remote device by just installing a client software. IPSec works on the IP security. It is normally used when there is any need to communicate others via net.