Re: Regression in svnserve: IPv6 causes IPv4 not to work [was: Branching for 1.3.]

Greg Hudson wrote:
> On Fri, 2005-09-23 at 21:54 -0400, Michael Sweet wrote:
>
>>>Even if we set IPV6_V6ONLY on the v6 socket?
>>
>>Yes, because on OpenBSD (and perhaps others of the *BSD lineage)
>>the IPV6_V6ONLY socket option is apparently read-only...
>
>
> Yes, but I'm talking about setting it to 1, so that we can create the
> two separate sockets. On OpenBSD it's read-only, but it's always set to
> 1.

OK, gotcha.

>> > (If the OS does not define
>>
>>>IPV6_V6ONLY, then I think we can safely assume that it will allow v4 and
>>>v6 connections on the same socket.)
>>
>>No, actually, I don't think that is the case.
>
>
> Okay. So we create an IPV6 socket, set IPV6_V6ONLY to 1 if possible,
> then create an IPV4 socket. If the second bind call fails with an
> address-in-use error, we assume the V6 socket is handling V4 connections
> and the stack was incapable of turning off v4 mappings.

That strategy should work well.

-- 
______________________________________________________________________
Michael Sweet, Easy Software Products           mike at easysw dot com
Internet Printing and Publishing Software        http://www.easysw.com
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