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

Charles Lee littlee at linux.vnet.ibm.com
Mon Nov 28 18:11:10 PST 2011

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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