Even foods that are good for your health may have some properties that make them less than ideal. And some things that you eat are just plain bad for you. Lectins are often cited as a property in foods that you should avoid.
DS-Lite is an IPv6 migration technology, where the access network of the service provider is running IPv6.
Assuming there are multiple end systems in the customer network, the DS Lite function occurs on a CPE device such as a home gateway as shown in Figure 2. If a device sends an IPv6 packet, the packet is routed normally to the IPv6 destination. If a device sends an IPv4 packet, the CPE gateway performs the IPv4-in-IPv6 encapsulation, setting the destination address of the IPv6 packet to the address of the DS Lite enabled LSN. This model allows use of dual stacked, IPv4-only, and IPv6-only devices behind the gateway.