Hi, I am using an dns which for lan purpose. at isa in the internal interface i gave the dns ip which is 10.0.0.100, whcih is local dns and in the dns server i gave the isa internal ip as gateway address. and i had also make the internal dns to work as forwarder(caching) and give the isa's internal ip for forwarding. it also works fine. is there any major security issue comes if i make the isa also a dns (name caching)server. problem is when i am accessing a fully new website in client machine it takes a little bit time to resolve but after i once accessed it in the isa or dns then it works fine. so as per my thinking it is a dns caching and web caching problem. have u any advice for acceleration............ Brajesh Ranjan Panda System Administrator DIVAS OFFSHORE SOFTWARE TECHNOLOGY (P) LTD. N-1/3, DLF-II, GURGAON, HARYANA,INDIA www.divassoftware.com