/var/log/message 错误error (network unreachable)
如果在/var/log/message日志里出现一下内容
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns1.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'nsc.nic.uk/A/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'nsc.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns2.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns3.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'nsa.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving './NS/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns6.nic.uk/AAAA/IN': 2001:500:2f::f#53
原因是try to use IPv6 transport even if the server host does not have IPv6 connectivity
解决方法：
可以在直接编译配置文件/etc/sysconfig/named，去除去IPv6的解析，只解析IPv4，OPTIONS="whatever" 改为 OPTIONS="-4"，注意OPTIONS选项的值可以是：whatever、-4、-6中的一个
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns1.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'nsc.nic.uk/A/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'nsc.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns2.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns3.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'nsa.nic.uk/AAAA/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving './NS/IN': 2001:500:2f::f#53
Jul 8 13:36:34 master named-sdb[6324]: error (network unreachable) resolving 'ns6.nic.uk/AAAA/IN': 2001:500:2f::f#53
原因是try to use IPv6 transport even if the server host does not have IPv6 connectivity
解决方法：
可以在直接编译配置文件/etc/sysconfig/named，去除去IPv6的解析，只解析IPv4，OPTIONS="whatever" 改为 OPTIONS="-4"，注意OPTIONS选项的值可以是：whatever、-4、-6中的一个
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/30345407/viewspace-2121311/ ，如需转载，请注明出处，否则将追究法律责任。
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