Updated dhcp packages that fix one security issue and two bugs are nowavailable for Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having lowsecurity impact. A Common Vulnerability Scoring System base score,which gives a detailed severity rating, is available from the CVE link inthe References section. The dhcp packages provide the Dynamic Host Configuration Protocol that allows individual devices on an IP network to get their own networkconfiguration information, including an IP address, a subnet mask, and abroadcast address.A flaw was found in the way the dhcpd daemon handled the expiration time ofIPv6 leases. If dhcpd#39;s configuration was changed to reduce the defaultIPv6 lease time, lease renewal requests for previously assigned leasescould cause dhcpd to crash. This update also fixes the following bugs:* Prior to this update, the DHCP server discovered only the first IPaddress of a network interface if the network interface had more than oneconfigured IP address. As a consequence, the DHCP server failed torestart if the server was configured to serve only a subnet of thefollowing IP addresses. This update modifies network interface addressesdiscovery code to find all addresses of a network interface. The DHCPserver can also serve subnets of other addresses. * Prior to this update, the dhclient rewrote the /etc/resolv.conf filewith backup data after it was stopped even when the PEERDNS flag was setto quot;noquot; before shut down if the configuration file was changed while thedhclient ran with PEERDNS=yes. This update removes the backing up andrestoring functions for this configuration file from the dhclient-script.Now, the dhclient no longer rewrites the /etc/resolv.conf file whenstopped. All users of DHCP are advised to upgrade to these updated packages, whichfix these issues. After installing this update, all DHCP servers will berestarted automatically.