Barracuda Networks NG FIREWALL 5.0.3 - Manual (Page 21)

21 Release and Migration Notes - Updating Standard Hardware from 4.2.x to 5.0.3
Updating Standard Hardware from 4.2.x to 5.0.3
General
Due to a kernel version change between 4.2.x and 5.0.3 (Linux kernel 2.4 was changed to Linux kernel
2.6), the enumeration of NICs may on some hardware sort the ethX devices in a different order,
resulting in a loss of management access.
Therefore, a procedure has now been implemented to rename the interfaces after upgrading to 5.0.3
to stay identically with the 4.2.x interface names. This is done by creating an interface mapping table
using the eth device’s MAC addresses as identifiers.
The following procedure must be performed on every single unit separately due to the fact the MAC
addresses are different per unit and so will be the mapping table.
If you find out later that your server is not affected by the resorting issue, then you may delete the
mapping configuration subsequently. The network activation log will then contain the following
message:
No difference found between configured and detected MAC to interface mapping
• Update is possible on standalone as well as on NG CC-managed units from
firmware 4.2.0 onwards to 5.0.3.
• Updating from a base release in the range from 4.2.0 to 4.2.14 requires a hotfix
to be installed. 4.2.15 and 4.2.16 include the functionality, hence no hotfix is
required.
• It is recommended to evaluate the process on a system with physical access
or in a lab environment in case the upgrade fails.
• The procedure is compatible with user defined interface mappings. If a user
defined interface mapping is found, it will be applied after the MAC-to-eth
mapping procedure.
• If you add additional NICs after upgrading to 5.0.3, the mapping may fail.
Therefore, do not use MAC mapping in this case any longer but switch to user
defined interface mapping. The problem may occur if linux detects the new
NICs before it detects the old ones.
Updating Procedure
Step 1: Prepare the Standard Hardware For the Update
• If the unit runs on firmware 4.2.14 or below, you must install the hotfix
boxnet_mac2ifmapping-386-4.2.14.