[sr-dev] dns_try_ipv6

[Juha Heinanen]

Andrei Pelinescu-Onciul writes:

 > dst_blacklist_init=off if you want it disabled without the possibility
 > to enable it later ar runtime.
 > use_dst_blacklist=off, if you want to start with it disabled, but with
 > the possibility to enable it later at runtime via rpcs
 > (e.g. $ sercmd cfg.set_int_now core use_dst_blacklist 1 ).
 > 
 > Note however that the blacklist in sr is ip based and not dns based
 > (I don't know how the blacklist worked in k).

i think i was mixing things up again.  sr variables are dst, not dns. 
perhaps they are not same thing at all.  in k,

disable_dns_blacklist

The DNS resolver, when configured with failover, can automatically store
in a temporary blacklist the failed destinations. This will prevent (for
a limited period of time) openser to send requests to destination known
as failed. So, the blacklist can be used as a memory for the DNS
resolver.  

The temporary blacklist created by DNS resolver is named ??dns?? and it
is by default selected for usage (no need use the use_blacklist())
function. The rules from this list have a life time of 4 minutes - you
can change it at compile time, from blacklists.h .  

Can be 'yes' or 'no'. By default the blacklist is disabled (Default
value is 'yes').

if sip-router does not include dns blacklisting, then i can just delete
the line, because i was turning dns black listing off in k config.

-- juha