EE 281 Lecture Notes - Lecture 9: Network Socket, Checksum, Internet Control Message Protocol
Document Summary
An internet service provider (isp) will often be assigned large blocks of ip addresses by a. Routers between isps will need to know which block of addresses is handled by which isp. A specific isp will allocate smaller blocks of ip addresses to organizations or lower-tiered isps. This is not relevant information outside of the isp since outside routers only need to know how to reach one of the isp"s routers. Routers within the isp need to route to the organizations that were allocated those addresses. Within rutgers, for example, are multiple networks that use blocks within the 128. 6. 0. 0/16 allocation. For instance, the host aramis. rutgers. edu has an address of 128. 6. 4. 2 and a netmask of 0xffffff00. This indicates that it is in a subnetwork that is defined by the prefix 128. 6. 4. 0/24. Ip supports several special addresses: bit patterns that cannot be used as generic host addresses. An address of 255. 255. 255. 255 represents a limited broadcast address.
