Florin Iucha wrote: > Guys, > > I am looking in the /var/log/secure of a centos server and I see that > the IP address is prefixed by "::ffff:". What is that? IPv4 tunneled > through IPv6? Looks like an IPv4 mapped address maybe? http://en.wikipedia.org/wiki/IPv4_mapped_address "IPv4 mapped addresses are normally used by the IP stack to represent IPv4 addresses to IPv6 applications." -Steve