Hi, In the process of creating some DHCP fingerprints for NAC devices that are not showing up. The best why to do this would be to run dhcpdump on the NAC server and record the details given in option 55 and write the fingerprint to match. Problem is when running 'apt-get install dhcpdump', I get the following error: E: The package libc6 needs to be reinstalled, but can't find an archive for it. In order to run dhcpdump you require the following packages: libc6 >= 2.4 libpcap0.8 >= 0.9.3-1 Running an 'apt-cache policy libc6' shows that the current version is 2.15. So I beleive I need to run an apt-get update in order to bring everything to the versions I need. So my question is, is this safe to do on a NAC apliance? NetSight is running version 126.96.36.199 and OS is Ubuntu 12.04 LTS Many thanks in advance.