I have SYNC="rsync://mirrors.eu.kernel.org/gentoo-portage/" in /etc/portage/make.conf, and for several days I am getting this message when running "eix-sync"
>>> SERVER OUT OF DATE: rsync://188.8.131.52/gentoo-portage/
>>> In order to force sync, remove '/usr/portage/metadata/timestamp.chk'.
FYI, the hostname revolves to a single IP:
taz ~ # host mirrors.eu.kernel.org
mirrors.eu.kernel.org has address 184.108.40.206
mirrors.eu.kernel.org mail is handled by 20 zeus1.kernel.org.
mirrors.eu.kernel.org mail is handled by 30 zeus2.kernel.org.
mirrors.eu.kernel.org mail is handled by 999 bl-ckh-le.kernel.org.
mirrors.eu.kernel.org mail is handled by 10 mail.kernel.org.
taz ~ #
I don't actually see this mirror in our list at all, so I don't think we monitor it or care if it is behind (although it appears to have caught up?)
http://www.gentoo.org/main/en/mirrors-rsync.xml lists the mirrors we advertise.