Solaris Performance and Tools: DTrace and MDB Techniques for Solaris 10 and OpenSolaris

7.6. Misconfigurations

Sometimes poor network performance is due to misconfigured components. This can be difficult to identify because there no error statistic indicates a fault; the misconfiguration might be found only after meticulous scrutiny of all network settings.

Places to check: all interface settings (ifconfig -a), route tables (netstat -rn), interface flags (link_speed/link_mode, discussed in Section 7.7.6), name server configurations (/etc/nsswitch.conf), DNS resolvers (/etc/resolv.conf), /var/adm/messages, FMA faults (fmadm faulty, fmdump), firewall configurations, and configurable network components (switches, routers, gateways).