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Re: mech-v2-05pre

Pekka Savola wrote: 
On Thu, 26 Aug 2004, Alex Conta wrote:

I suggest two small changes: remove 'the', and replace 'as' with 'of the' as in the following text:

   All tunnels are assumed to be bidirectional, behaving as virtual
   point-to-point links between nodes, using IPv4 addresses of the
   tunnel endpoints.



Let's discuss this in another thread off-list, as it seems more of
wordsmithing than anything else.


I am going to answer on the list to this separately. It may look like wordsmithing, but it is not. It is about mixing architectural concepts/definitions, it is about consistency.


I suggested "automatically selected", to balance, and for symmetry to
"manually configured". Even if you remove "automatic selection", if it is not "manually configured", then it is still automatically selected, so you say "manually" for "configuring", but you say nothing for "automatic selection".

If you dislike "automatically selected", then just remove "manually", to
balance the text, but to me, the text that says both is better balanced.



I could replace "manually configured" by "configured by the
administrator", if that would sound better without "automatically
selected".. otherwise I'd prefer to leave it as is.


Actually "...administrator" sounds better.

I agree that the implementation has to select in any case (because it
says "an address"; that's because I didn't want to open the discussion
which would ensure if it said "the address" if you have multiple
addresses), but it just needs to be picked in any case, and it seems
worse to spell it out because it's suboptimal in the case when there
are multiple addresses.

[...]
The "automatic selection of source address" relies on *route* selection:
this is always deterministic. The selected route to destination yields the outgoing interface, which is also deterministic.

Not necessarily if you run routing protocols.

The selection of a route, and yielding the outgoing interface is a deterministic process - longest prefix match is the algorithm - regardless of using routing protocols, or manually configured routes.

Note, a route change may occur even if you do not use routing protocols: an operator can enter any time commands to add/change/remove routes, which may have exactly the same effect as dynamic routing changing of routes.

Route changes somewhere
in the net could change the outgoing interface to be more optimal,
while the original interface's addresses could still work as well.

I just realize, that you and I used the word "deterministic" to mean different things. So I am going to change the text you last suggested, to reflect your meaning.


Maybe it should be elaborated with another sentence like:

Configuring the source address is appropriate particularly in cases
in which automatic selection of source address is not deterministic;
this is often the case, e.g., with multiple addresses or with multiple interfaces when using routing protocols.



Configuring the source address is appropriate particularly in cases in which automatic selection of source address results in different addresses in a certain period of time. This is often the case with multiple addresses, and multiple interfaces, when routes change frequently.

or

Configuring the source address is appropriate particularly in cases in which automatic selection of source address is producing different results in a certain period of time. This is often the case with multiple addresses, and multiple interfaces, when routes change frequently.

Regards,
Alex

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