file is /usr/portage/distfiles/netkit-telnetd-0.17.tar.gz

# export PKGDIR=/usr/portage

# emerge --usepkgonly netkit-telnetd
... tries to download...

# emerge --usepkgonly =netkit-telnetd-0.17
... no ebuilds

# emerge netkit-telnetd -s
Latest version: 0.17-r6, not installed...

> what's the machine at 10.10.10.1? Is it an ADSL router?
yes it is.

All netkit-* files are under /usr/portage/distfiles and have a tar.gz
extension.