CDRouter IPv6 User Guide 6.3/Testing Exercises
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Testing Exercises
Aside from running each test case in CDRouter IPv6, other testing scenarios can be created. The following test scenarios are recommended.
Our IPv6 whitepapers on residential IPv6 testing with CDRouter and DHCPv6 prefix delegation testing with CDRouter also contain a number of common issues associated with residential IPv6 implementations.
Vary the IPv4 Configuration
IPv6 functionality within the device under test should be consistent regardless of its IPv4 configuration. CDRouter IPv6 can be used to efficiently verify that the IPv6 functionality of the device under test continues to perform as expected across a wide range of IPv4 WAN modes and configurations.
With CDRouter multiple configuration files can be created that each have a different IPv4 WAN configuration. For example, separate configuration files for all of the supported IPv4 WAN connection modes, including static IP, DHCP, PPPoE, PPPoA, PPP/T1, PPTP, and L2TP, can be easily created and tested. Other parameters such as the default IPv4 addresses assigned by CDRouter to the device under test can also be modified and tested. Running CDRouter IPv6’s test modules against the device under test in all of the above configuration scenarios will quickly reveal any inconsistent behavior.
Add a Wireless LAN Client
IPv6 functionality should be consistent for both wired and wireless LAN clients. Running the same set of test cases with both wired and wireless LAN clients will quickly reveal any discrepancies or inconsistencies in the device behavior. Note that certain test cases will be automatically skipped by CDRouter when using only a wireless LAN interface for testing. In these scenarios any test cases that require the creation of multiple LAN hosts, such as the scaling modules, will be skipped due to limitations inherent in the wireless drivers used.
Testing for Unofficial IPv6 Support
Some devices do not advertise support for or include any means to configure IPv6, yet do actually provide IPv6 connectivity for LAN clients. Such devices will often automatically create an IPv6 6to4 connection on the WAN and begin sending IPv6 Router Advertisements on the LAN.
CDRouter IPv6 can be used to quickly determine if a device unofficially supports IPv6 by utilizing a basic IPv6 configuration similar to Example 1 above. If CDRouter successfully passes startup with this IPv6 configuration enabled, one can assume that some level of IPv6 functionality is supported within the DUT.
Test all IPv6 Modes Supported by the DUT
Devices that support IPv6 often have a wide range of configuration options. A great testing exercise is to test all of the different combinations of IPv6 related options supported by the DUT. If a DUT supports four different IPv6 WAN connection modes (assume DHCPv6 with and without prefix delegation, static IPv6, and 6to4) and two LAN modes (assume autoconf and DHCPv6) there are essentially eight different baseline configurations that can be tested. Mixing in various other options, such as DNS or prefix delegation configuration options, will grow the possible test matrix further.
This type of testing is easy to perform with CDRouter and provides a great baseline for a device’s overall IPv6 behavior across a wide range of possible configurations. Any inconsistent or broken behavior can be easily and quickly identified this way. This same methodology can be extended to include IPv4 configuration options as well, as mentioned earlier in this section.