bikeshed for all!

Julian Elischer julian at
Wed Dec 12 15:46:38 PST 2007

Max Laier wrote:
> On Thursday 13 December 2007, Julian Elischer wrote:
>> Max Laier wrote:
>>> On Wednesday 12 December 2007, Julian Elischer wrote:
>>>> So, I'm playing with some multiple routing table support..
>>>> the first version is a minimal impact version with very limited
>>>> functionality. It's done that way so I can put it in RELENG_6/7
>>>> without breaking ABIs (I hope). Later there will be a more flexible
>>>> version for-current.
>>>> Here's the question..
>>>> I need a word to use to describe the network view one is currently
>>>> on.. e.g. if you are usinghe second routing table, you could say
>>>> I've set xxx to 1 (0 based)..
>>>> current;y in my code I'm using 'universe' but I don't like that..
>>>> one could think of it as a routing plane..
>>>> each routing plane has he same interfaces on it but they are
>>>> logically treated differently becasue each plane has a different
>>>> routing table.
>>>> so here's an axample of  it in use now...
>>>> the names should change...
>>>> setuniverse 1 netstat -rn
>>>> [shows table 1]
>>>> setuniverse 2 route add
>>>> setuinverse 1 route add
>>>> setuniverse 2 route -n get
>>>> [shows]
>>>> setuniverse 1 route -n get
>>>> [shows]
>>>> setuniverse 2 start_apache
>>>> [appache starts, always using to reach the 10.0.0 net.
>>>> also the syscall is setuniverse()
>>>> so, you see I really need a better name....
>>>> setrtab?
>>>> rtab? rtbl?
>>>> and the command should be called "????"
>>> FWIW, OpenBSD just added a "-T num" switch to concerned programs like
>>> route and netstat.  As far as I can tell they rely entirely on pf to
>>> select a table - so there is no way to start a program "inside" a
>>> certain network view.  OTOH, how - in your system - would you decide
>>> which table to use for forwarded packets?
>> ipfw/pf/ipf rule (not yet added) :-)
> pf has ifdef'ed out code to deal with the OpenBSD version of routing 
> tables.  What it does is adding an mbuf_tag which carries the tableid and 
> ip_{{in,out}put,forward} take action accordingly.

EXACTLY what I plan on doing.

>>> More to the bikeshed pov, "universe" seems rather broad.  "netview"
>>> comes to mind.  "rtabselect", though that has a lot of characters,
>>> but then again "setuniverse" is even one char longer ;)

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