This fixes the problem of getent ahosts localhost returning 127.0.0.1 _twice_ on systems that have no ipv6 interfaces up (hence are regarded as ipv4 only by the lookup code), but still have localhost entries for ::1 and 127.0.0.1 in /etc/hosts (like most current systems). Remapping ::1 to 127.0.0.1 is bogus when /etc/hosts is correct. bnc #684534, #606980 http://sources.redhat.com/bugzilla/show_bug.cgi?id=4980 Index: glibc-2.17.90/nss/nss_files/files-hosts.c =================================================================== --- glibc-2.17.90.orig/nss/nss_files/files-hosts.c +++ glibc-2.17.90/nss/nss_files/files-hosts.c @@ -68,11 +68,6 @@ LINE_PARSER { if (IN6_IS_ADDR_V4MAPPED (entdata->host_addr)) memcpy (entdata->host_addr, entdata->host_addr + 12, INADDRSZ); - else if (IN6_IS_ADDR_LOOPBACK (entdata->host_addr)) - { - in_addr_t localhost = htonl (INADDR_LOOPBACK); - memcpy (entdata->host_addr, &localhost, sizeof (localhost)); - } else /* Illegal address: ignore line. */ return 0;