Dear All, My squid is running on fedora core 1, and it installed by using the RPM which's bundled with fedora core 1, currently my squid can not deny users based on the MAC address of the NIC, from the internet resources I got the solution for making my squid running as what as I need, What I have done are as follow: I changed the squid.spec which located under /usr/src/redhat/SPEC and add --enable-arp-acl into the ./configure section. I rebuild the rpm by running: rpmbuild -bb squid.spec I got new squid-2.5.STABLE3-0 rpm .. which located under /usr/src/redhat/RPMS/i386 I try to install it .. by running .. but I got "Segmentation fault" [root@proxy-HO i386]# rpm -i squid-2.5.STABLE3-0.i386.rpm Segmentation fault please advise .. what should I do ? Thanks a lot in advance & Regards Winanjaya