iptables-1.4.20 update changed soname of libxtables from 9.0.0 to 10.0.0; this triggered a @preserved-libs event for sys-apps/iproute2. Please consider adding a slot operator on the iptables atom in the next revbump of sys-apps/iproute2, so that when bug 489882 is resolved, this issue will not occur again.
Added to 3.12.0.