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with a v1.x DNAS, it uses 'portbase' (listeners / web request) and 'portbase+1' (sources) as v1.x cannot deal with clients and sources on the same port due to the protocol design.
with a v2.0 DNAS, it follows the same methodology as a v1.x DNAS to maintain compatibility with v1.x and v2 protocol sources. the only difference is if using a v2 protocol source it connects on 'portbase' so it can all be run on the same port if only using v2 based tools.
with a v2.2 DNAS, it can do the same as a v2.0 DNAS. however, it can be configured to disable the 'portbase+1' support (if wanted) or use a completely different port i.e. 'portlegacy' (which in the source software then has be entered as 'portlegacy-1' so the correct port will be used by v1 protocol software (which is the only type which can connect to it).
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