Httpd problem, suspect an attack but not sure
Perhaps this helps you a bit:
# for i in $(sort /tmp/ips | uniq); do geoiplookup $i ;done | sort | uniq -c
4 GeoIP Country Edition: AU, Australia
83 GeoIP Country Edition: CN, China
13 GeoIP Country Edition: --, N/A
1 GeoIP Country Edition: NZ, New Zealand
1 GeoIP Country Edition: SE, Sweden
21 GeoIP Country Edition: US, United States
I've seen that some are from "regular" spiders (baidu etc).