unknown ftp in /etc/security/failedlogin

[gatetec]

I keep getting this failed login. Is there a way to keep trace back what it is from? The IP is not pingable.

/etc/security/failedlogin
UNKNOWN FTP Jun 08 02:06 :ffff:159.140.xxx.xx)
UNKNOWN FTP Jun 08 02:07 :ffff:159.140.xxx.xx)
UNKNOWN FTP Jun 08 04:06 :ffff:159.140.xxx.xx)
UNKNOWN FTP Jun 08 04:07 :ffff:159.140.xxx.xx)

thx much

 

[ogniemi]

from

http://en.wikipedia.org/wiki/IPv6

...A sequence of 4 bytes at the end of an IPv6 address can also be written in decimal, using dots as separators. This notation is often used with compatibility addresses (see below). This addressing scheme is convenient when dealing with the mixed environment of IPv4 and IPv6 addresses. The general notation is of the form x:x:x:x:x:x:d.d.d.d where the x's are the 6 higher order groups of hexadecimal digits whereas the d's correspond to the decimal digits of lower order octets of the address, as it is in the IPv4 format. For example, ::ffff:12.34.56.78 is the same address as ::ffff:0c22:384e and 0:0:0:0:0:ffff:0c22:384e. Usage of this notation is deprecated and unsupported by numerous applications...