/var/log/message 錯誤error (network unreachable)
如果在/var/log/message日誌裡出現一下內容
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
解決方法：
可以在直接編譯配置檔案/etc/sysconfig/named，去除去IPv6的解析，只解析IPv4，OPTIONS="whatever" 改為 OPTIONS="-4"，注意OPTIONS選項的值可以是：whatever、-4、-6中的一個
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
解決方法：
可以在直接編譯配置檔案/etc/sysconfig/named，去除去IPv6的解析，只解析IPv4，OPTIONS="whatever" 改為 OPTIONS="-4"，注意OPTIONS選項的值可以是：whatever、-4、-6中的一個
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/30345407/viewspace-2121311/，如需轉載，請註明出處，否則將追究法律責任。
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