Answer by JeffMorriss for I am very new to Linux. Working with a machine that is unable to connect to the internet, due to the environment that it is in. Please could someone give me a way of installing. I have tried packaged installs (RPM) that didn't work, i am happy with terminal, however i would need guidance. Links to the software would be great too as i seem to not find the right ones. The machine its running on is a normal X86_64 machine.

You should be able to just `yum install wireshark*.rpm` once you have the RPMs. Looks like you could get the latest RHEL/CentOS Wireshark RPMs [here](https://mirrors.edge.kernel.org/centos/7.5.1804/os/x86_64/Packages/). You'll want both the `wireshark` and `wireshark-gnome` packages. **Edit:** As @Jaap noted, there will probably be dependencies (more RPMs that you'll need to install). `yum` should tell you which dependencies you're missing; then it just becomes lather-rinse-repeat until you get all the appropriate RPMs and the installation succeeds. A better way may be to get a RHEL DVD, put it in the computer, and install from that. You'd have to look at the repolist (`yum repolist all`) and then run `yum` with all repos except the DVD disabled (something like `yum --disablerepo=\* --enablerepo=c7-media install wireshark-gnome`) where "c7-media" is the name of the DVD repo (that's the name on CentOS 7).