/var/log/iptables/drop.log {
    size 0k
    rotate 5
    compress
    missingok
    notifempty
    dateext
    copytruncate
    dateformat -%s
    postrotate
        /usr/lib/rsyslog/rsyslog-rotate
    endscript
    lastaction
        /bin/find /var/log/iptables/ -maxdepth 1 -name "drop.log-*.gz" | /bin/xargs -I % mv % /var/log/iptables/archive/
    endscript
}