[asterisk-dev] IPv4 and IPv6 preference

[Mark Michelson]

On 07/16/2010 08:45 AM, Olle E. Johansson wrote:
> 16 jul 2010 kl. 15.33 skrev Simon Perreault:
>
>    
>> On 2010-07-16 09:23, Olle E. Johansson wrote:
>>      
>>> I've been trying to understand some of the DNS support for IPv6 and can't find traces here. It seems a bit random.
>>>        
>> By default, on most OSes, getaddrinfo() will return IPv6 results first.
>>
>> We make no attempt to change the default order. However, we don't want
>> to connect to IPv6 addresses if we are bound only to IPv4, and
>> vice-versa. So we implemented the following heuristic:
>>
>> - If bindaddr is the IPv6 wildcard address (i.e. ::), we do not filter
>> results.
>> - If bindaddr is an IPv4 address, we only use IPv4 results.
>> - Otherwise, we only use IPv6 results.
>>      
> Hmm. I need to revisit the code, because I saw nothing doing this in dnsmgr or acl.c. Must have put my brain in weekend-mode early...
>    
While the mention of dnsmgr.c has merit, acl.c doesn't need such a 
distinction because users are required to use IP addresses. Host names 
are not allowed in ACLs so DNS will not come into the picture.

Mark Michelson