Suspicious firewall logs

Hi,

     I had one incidents which is require for your help. My firewall keep prompting some traffiics from internal LAN IPs trying to access this group of destination IPs for "http" service  

208.172.144.155
208.172.158.234
208.172.128.132
208.172.192.132
208.172.224.132
208.174.16.132
208.172.13.253
 

Actually, my question is why my internal LAN(few IPs) keep trying to access this group of destination IP for http service. My LAN if want to go out internet, it should go through our proxy first. It not suppose go out to external directly.  

Thanks... Received on Fri Aug 1 12:54:47 2003