How do you do an offline install in RHEL7.

edit

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. 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).