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3. Networking

Berkeley Internet Name Domain (BIND)

On most modern networks, including the Internet, users locate other computers by name. This frees users from the daunting task of remembering the numerical network address of network resources. The most effective way to configure a network to allow such name-based connections is to set up a Domain Name Service (DNS) or a nameserver, which resolves hostnames on the network to numerical addresses and vice versa.

The Berkeley Internet Name Domain (BIND) is an implementation of the DNS protocols. BIND includes a DNS server, a resolver library, and tools for verifying that the DNS server is operating correctly. Red Hat Enterprise Linux 5.6 includes version 9.7 of the BIND implementation. These updated packages add support for version 3 of the Next Secure (NSEC3) resource record in the DNS Security Extensions (DNSSEC). Additionally, this update features support for the RSA/SHA-2 algorithms in DNSSEC, and the HMAC-SHA2 algorithms for Transaction Signatures (TSIG).
Network Debugging using dropwatch

The kernel features the Netlink Drop Monitor (DROP_MONITOR) service that provides detailed network packet loss monitoring. Red Hat Enterprise Linux 5.6 features the new dropwatch utility to interface with the drop monitor service, and return the results to userspace.

Ethernet bridge tables

Ethernet bridge tables (ebtables) is a firewalling tool to transparently filter network traffic passing a bridge. The filtering possibilities are limited to link layer filtering and basic filtering on higher network layers. ebtables is a new package for the Red Hat Enterprise Linux 5.6 release.