Red Hat Knowledgebase

Red Hat recommends using the curl open source tool for downloading ISO images. This tool enables you to resume downloads that have been interrupted. If you use Red Hat Network (RHN) and do not currently have curl, you may install it by running the command up2date curl from a shell prompt. Alternativley, you can install the curl utility from your Installation CDs.

Once Curl is installed, at a shell prompt, cut and paste the URL for the ISO into the Curl command as follows:

$ curl -C - -O 'very_long_url'

The URL, which can be derived from the Download Software page of the RHN website, is very long because it contains session authentication information. An example 'very_long_url' might look like the following (note that I broke the link into two lines):
http://download-2.rhn.redhat.com/download/ak/rhn/isos/rhel-3-u2/rhel-i386-as-3/ rhel-3-U2-i386-as-disc1.iso?auth=%2F1090298789%2F98b4871f0fa55ec9998a262d1f6143d%2F439866%2F9247

Which was found as the link labeled "Disc #" or "Binary Disc #" in the ISO image table on the Easy ISOs page.

Be sure to include the single quotation marks around it. The -C - option allows you to continue the download if it is interrupted, such as by a lost connection. The -O (the capital letter 'O', not a zero) option will save the file with the same name as on the RHN servers.