[radvd-devel-l] radvd to check whether forwarding is enabled

[Pekka Savola]

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Hi,

Triggered by a code snippet by Marko, I took the time to add a feature 
which checks whether forwarding has been enabled before starting radvd.

Note that if the correct sysctl setting is not found (usually caused by 
kernel sysctl interface change), radvd will start, nevertheless.. this is 
of advisory value only anyway..

(personally I dislike putting sysctl branches in pathnames.h but couldn't
figure out a better place..)

I'll wait for possible comments for a few days before committing.

-- 
Pekka Savola                 "Tell me of difficulties surmounted,
Netcore Oy                   not those you stumble over and fall"
Systems. Networks. Security.  -- Robert Jordan: A Crown of Swords


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