Hello! When I perform update, I found the followings:- # yum update Loading "installonlyn" plugin Setting up Update Process Setting up repositories Reading repository metadata in from local files Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Package libpcap.i386 14:0.9.4-10.fc6 set to be updated ---> Package tcpdump.i386 14:3.9.4-10.fc6 set to be updated --> Running transaction check Dependencies Resolved ============================================================================= Package Arch Version Repository Size ============================================================================= Updating: libpcap i386 14:0.9.4-10.fc6 updates 95 k tcpdump i386 14:3.9.4-10.fc6 updates 443 k Transaction Summary ============================================================================= Install 0 Package(s) Update 2 Package(s) Remove 0 Package(s) Total download size: 538 k Is this ok [y/N]: y Downloading Packages: Package libpcap-0.9.4-10.fc6.i386.rpm is not signed Two packages were not signed included the tcpdump... Do any problem happened ? Thanks! Wong Kwok Hon