The only current limitation of HP SUM in a Linux IPv6 environment is that all remote target Linux-based servers must have the iptables-ipv6 RPM file installed. You can find the file on the distribution media for both Red Hat Enterprise Linux and Novell SUSE Linux Enterprise Server operating systems. HP SUM uses this file to open a port in the IPv6 firewall to communicate with the Linux system that runs HP SUM. Failure to install iptables-ipv6 results in HP SUM reporting a discovery failure unless you disable the firewall.