I had the need to install FreeSWAN on an old RedHat Linux 7.3 machine. I initially tried to do a simple "rpmbuild --rebuild..." but that did not do the trick. I would get "unresolved symbol..." errors. I finally found a way to get the kernel module to compile correctly.

FreeS/WAN Project

Outline :

• Compile Source RPMs
• Install Compiled RPMs

• Compile Source RPMs
  • The machine I was working on had the following kernel installed:
    • kernel-2.4.20-42.7.legacy
    • kernel-utils-2.4-7.4
    • kernel-source-2.4.20-42.7.legacy
  • prompt> rpmbuild --rebuild --without smp --without uml --without bigmem --without debug --target i686 freeswan-2.06-1fs.src.rpm
  • Adjust the above options to match your particular needs.
• Install Compiled RPMs
  • Move to the folder with the compiled RPMs
    • prompt> cd /usr/src/redhat/RPMS/i686/
  • Install the RPMs
    • prompt> rpm -Uvh freeswan-*.rpm
  • Refresh the kernel module dependencies
    • prompt> /sbin/depmod -ae
  • If the above command did not give any errors, proceed. Otherwise, go back and check the options chosen during the "rpmbuild".
  • Load the IPSec kernel module
    • prompt> /sbin/modprobe ipsec
  • Edit the IPSec settings to your needs. Go to the FreeS/WAN Project Documentation on configuring your machine.
    • prompt> vi /etc/ipsec.conf
  • Start the FreeS/WAN IPSec Services
    • prompt> /sbin/service ipsec start