BIND9架设中碰到问问题以及解决方法

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错误信息：
[root@NS2-DNS log]# tail -f named.log
17-Feb-2011 12:27:25.614 lame-servers: network unreachable resolving 'ns.cdnetworks.co.kr/A/IN': 2001:dc5:a::1#53
17-Feb-2011 12:27:25.614 lame-servers: network unreachable resolving 'ns2.cdnetworks.co.kr/A/IN': 2001:dc5:a::1#53
17-Feb-2011 12:27:25.614 lame-servers: network unreachable resolving 'ns.cdnetworks.co.kr/AAAA/IN': 2001:dc5:a::1#53
17-Feb-2011 12:27:25.614 lame-servers: network unreachable resolving 'ns3.cdnetworks.co.kr/A/IN': 2001:dc5:a::1#53
17-Feb-2011 12:27:25.614 lame-servers: network unreachable resolving 'ns2.cdnetworks.co.kr/AAAA/IN': 2001:dc5:a::1#53
17-Feb-2011 13:16:38.785 lame-servers: network unreachable resolving '40.10.249.218.in-addr.arpa/PTR/IN': 2001:7fe::53#53
17-Feb-2011 13:16:38.785 lame-servers: network unreachable resolving '40.10.249.218.in-addr.arpa/PTR/IN': 2001:500:3::42#53
17-Feb-2011 13:16:39.317 lame-servers: network unreachable resolving 'ns1.apnic.net/A/IN': 2001:dc0:1:0:4777::131#53
17-Feb-2011 13:16:39.317 lame-servers: network unreachable resolving 'ns1.apnic.net/A/IN': 2001:67c:e0::3#53

解决方法：关闭ipv6

第一种：直接编译配置文件/etc/sysconfig/named，去除去IPv6的解析，只解析IPv4（这种方法方便，呵呵）OPTIONS="whatever" 改为  OPTIONS="-4"，注意OPTIONS选项的值可以是：whatever、-4、-6中的一个第二种：禁用IPv6也是可以的（1）编辑配置文件/etc/sysconfig/network，然后将NETWORKING_IPV6=YES改为NETWORKING=no（2）关闭ip6tables这个服务（3）向/etc/modprobe.conf文件中，添加alias ipv6 off alias net-pf-10 off