[Lilux-help] Various binaries on the same system ???

I have two servers based on the very same hardware. They both run the very same distro (RH4), the very same kernel (uname -r), and have the very same list of installed packages (rpm -qa) However, numerous binaries, including /bin/ps, /bin/bash, /bin/ls, and librairies do not match. They have * the very same length * the very same date but they have different hashes, because they have different contents (cmp fails) The differences are inside, not at the end. We searched for a rootkit, but didn't found any. The two different ps commands, copied from one to the other, show the same result. I tried rpm --verify. No probem. However, when replacing one binary by the one coming from the other host, rpm --verify compains... Is it normal to have differences in binaries on the same hardware, same distro, same kernel and same packages ??? Is there a "signature" added in some binaries ? Might the order of the installation cause such effect ? The problem is that I have, at the same customer site, two other servers that are exactly in the same situation, but running CentOS, and I have the same strange beheaviour... Does anybody has any suggestions, idea about this strange story ? -- Brent Frère Private e-mail: Brent(a)BFrere.net Postal address: 58, rue d'Esch L-3720 Rumelange Grand-Duchy of Luxembourg European Union Phone: +352-20.20.22.69 Fax: +352-26.30.05.96 URL: http://BFrere.net If you have problem with my digital signature, please install the appropriate authority certificate by browsing https://www.cacert.org/certs/root.crt.