Issue

• How do I disable or enable the IPv6 protocol in Red Hat Enterprise Linux?
• When I attempt to disable IPv6 in RHEL5, IPv4 does not connect. Had to re-enable IPv6 via console commands to connect to network.
• Why do I see errors when try to change IPv6 kernel parameters?

  # sysctl -p
  error: "net.ipv6.conf.default.accept_redirects" is an unknown key
  error: "net.ipv6.conf.default.accept_ra" is an unknown key
  error: "net.ipv6.conf.all.disable_ipv6" is an unknown key
  error: "net.ipv6.conf.default.disable_ipv6" is an unknown key