URG:Same Hostname for IPV4 & IPV6 address in /etc/hosts entry not working

Vinay L · 10-31-2013, 12:11 PM

Hi,

My /etc/hosts entry is as follows:

172.18.25.33 dns.search.com blrtestdev
::1 dns.search.com blrtestdev

Now I have developed an application which uses getaddrinfo to fetch the IP address using the hostname 'blrtestdev'.
On MAC 10.6 it is working fine. But on MAC 10.8 it is not working. Is adding entry on MAC 10.8 in /etc/hosts is different? Can't the same hostname(blrtestdev) be used for both IPV4 & IPV6 address? If I remove the the entry of fully-qualified domain name(dns.search.com) it works fine.

It would be helpful if the above doubts are clarified.

Thanks & Regards,
Vinay

anon237 · 11-01-2013, 05:11 AM

I'm not sure you can use the same FQDN and/or hostname for both ipv4 and ipv6. If I recall correctly this depends on how getaddrinfo is implemented.

Besides that, you also seem to point the same FQDN/hostname to two different interfaces (ipv4 points to a real interface and the ipv6 entry points to the loopback device).