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.
1 Internet Protocol security (IPsec) policies for Windows Firewall on client computers. For NAP IPsec enforcement, the IPsec enforcement client must be installed on client computers. For more information, see NAP Enforcement for IPsec Communications.  802.1X port-based wired and wireless network access control.