InetAddress.getLocalHost() returns APIPA/link-local address in a Windows 2008 SP2 or later version Windows OS with multiple-NICs.

[Charles Lee]

On 11/28/2011 05:41 PM, Alan Bateman wrote:
> On 28/11/2011 06:52, Charles Lee wrote:
>> Hi guys,
>>
>> When we call InetAddress.getLocalHost(), we usually return the first 
>> entry of inet address array. The array keeps the same order as 
>> getaddrinfo gets (duplication has been removed).
>>
>> In Windows 2008 sp2 or later version Windows OS with multiple NICs, 
>> getaddrinfo() sorts the Addresses and linklocal/APIPA address appears 
>> first now. So user will get a APIPA address even if a more useful 
>> address is available.
> I'm curious about this behavior. Are you saying that the host's name 
> resolves to addresses on all interfaces?
Yes.
> Also I thought that the default was to sort the addresses so that IPv4 
> addresses appear before IPv6 addresses (unless 
> java.net.preferIPv6Addresses is set to true).
>
> -Alan
You are right. The ipv4 will appear in front of ipv6, but the order of 
ipv4 or ipv6 (separately) will not be sorted.


-- 
Yours Charles

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