You want to use a Red Hat Enterprise Linux 5 machine to act as a Netdump server for your Red Hat Enterprise Linux 4 systems.
The netdump-server package is not shipped with Red Hat Enterprise Linux 5. Netdump has been replaced by Kdump (see How do I configure kexec/kdump on Red Hat Enterprise Linux 5? [7] for information on configuring Kdump).
If you need to continue using Netdump with Red Hat Enterprise Linux 5 to support older clients, there are two options:
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Set up a Red Hat Enterprise Linux 4 Virtual Guest on a Red Hat Enterprise Linux 5 machine and configure it as netdump server.
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Install the Netdump packages from the EPEL program on your Enterprise Linux 5 machine. See How do I use Extra Packages for Enterprise Linux (EPEL)? [8] for information about EPEL and how to use it.