[reSIProcate] (another) blacklist issue on resip 1.1

[Byron Campen]

	I had meant to get around to making this blacklist duration  
configurable, but I never had the time. There is some code in a  
branch (branches/b-DNS_greylist) that should make this problem go  
away entirely. You can do this by checking out the resiprocate-1.1  
tag from svn, and invoking "svn merge -r 6982:HEAD http:// 
svn.resiprocate.org/rep/resiprocate/branches/b-DNS_greylist ." within  
your checkout of resiprocate-1.1. Note that this code hasn't been  
used a whole lot lately. Your other option is to just comment out the  
lines in TransactionState.cxx where the 32s blacklisting calls are made.

Best regards,
Byron Campen

> Hi,
> We upgraded our application to use resiprocate 1.1 and some of our
> automated tests started failing. These were Session Timer tests that
> simulated a network failure by shutting down a SIP server in the  
> middle
> of a call. The test failures occurred because after it was  
> restarted the
> server was unavailable for 32s due to blacklisting (after a 408  
> with no
> response). The error logged is this:
>
> 9171 | 3013118896 | DnsResult.cxx:384 | Numeric result, but this  
> result
> is currently blacklisted: [ V4 192.168.20.88:25062 UDP target
> domain=192.168.20.88 connectionId=0 ]
>
>> From looking at the code and other posts related to blacklisting we
> (hopefully) understand why this is happening, and the tests can be  
> fixed
> by adding a 32 second delay in a few places, but we're wondering if
> there are other side-effects. For instance, our application is a  
> cluster
> of SIP servers (all based on resiprocate) that constantly exchange  
> their
> state using multicast, so there may be cases where a
> failed-and-then-restarted server reports that it's available but is
> actually unreachable for up to 32 seconds. On the other hand, our
> application also talks to external servers whose status is unknown to
> us, so blacklisting might be useful in those cases.
>
> While we consider the pros and cons of this, I was wondering if there
> were any other options available in release 1.1, or any advice from
> someone that's more familiar with what's going on here.
>   Regards,
>    Tom Joyner
>
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> _______________________________________________
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