当我查看 /var/log/messages 时，它显示以下日志：
Jun 1 16:33:51 dns13 named[1796]: client @0x7feac0084200 172.22.81.149#51759 (imap.mail.gxu.cn): query failed (SERVFAIL) for imap.mail.gxu.cn/IN/A at ../../../bin/named/query.c:8580
Jun 1 16:33:51 dns13 named[1796]: client @0x7fead40c59d0 172.22.81.149#50899 (imap.mail.gxu.cn): query failed (SERVFAIL) for imap.mail.gxu.cn/IN/A at ../../../bin/named/query.c:8580
Jun 1 16:33:51 dns13 named[1796]: client @0x7fead40c9af0 172.22.81.149#63975 (imap.mail.gxu.cn): query failed (SERVFAIL) for imap.mail.gxu.cn/IN/A at ../../../bin/named/query.c:8580
Jun 1 16:33:51 dns13 named[1796]: client @0x7feab40aaf30 172.22.81.149#50232 (imap.mail.gxu.cn): query failed (SERVFAIL) for imap.mail.gxu.cn/IN/A at ../../../bin/named/query.c:8580
Jun 1 16:33:51 dns13 named[1796]: client @0x7feadc0b15e0 172.22.81.149#49862 (imap.mail.gxu.cn): query failed (SERVFAIL) for imap.mail.gxu.cn/IN/A at ../../../bin/named/query.c:8580
为什么？我该如何解决我的问题？
我的named.conf是：
//
// named.conf for Red Hat caching-nameserver
//
acl "campusnet" {
127.0.0.1/32;
172.16.0.0/12;
};
options {
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
/*
* If there is a firewall between you and nameservers you want
* to talk to, you might need to uncomment the query-source
* directive below. Previous versions of BIND always asked
* questions using port 53, but BIND 8.1 uses an unprivileged
* port by default.
*/
// query-source address * port 53;
auth-nxdomain no;
//allow-query {any;};
allow-query {campusnet;127.0.0.1;};
allow-query-cache {campusnet;127.0.0.1;};
allow-recursion {campusnet;127.0.0.1;};
recursive-clients 1000000;
forward first;
forwarders {221.6.4.66;58.240.57.33;};
listen-on-v6 {
any;
};
//dnssec-enable yes;
//dnssec-validation yes;
//dnssec-lookaside auto;
};
//
// a caching only nameserver config //
controls {
inet 127.0.0.1 allow { localhost; } keys { rndckey; };
};
include "/etc/rndc.key";
//
zone "." IN {
type hint;
file "named.ca";
};
zone "16.28.210.in-addr.arpa" IN {
type master;
file "db.16.28.210";
};
//
zone "139.com" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
};
//
zone "10086.cn" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
};
//
zone "sina.com" IN {
type forward;
forward first;
// forwarders {221.228.255.1;218.2.135.1;};
forwarders {114.114.114.114;8.8.8.8;};
};
//
zone "sina.com.cn" IN {
type forward;
forward first;
// forwarders {221.228.255.1;218.2.135.1;};
forwarders {114.114.114.114;8.8.8.8;};
};
//
zone "126.com" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
};
//
// zone "163.com" IN {
// type forward;
// forward first;
// forwarders {221.228.255.1;218.2.135.1;};
// };
//
// zone "163.com" IN {
// type forward;
// forward first;
// forwarders {202.195.144.6;202.195.144.8;};
// };
//
zone "jsrcsb.cn" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
};
//
zone "taobao.com" IN {
type forward;
forward first;
// forwarders {221.228.255.1;218.2.135.1;};
forwarders {114.114.114.114;8.8.8.8;};
};
//
zone "tmall.com" IN {
type forward;
forward first;
// forwarders {221.228.255.1;218.2.135.1;};
forwarders {114.114.114.114;8.8.8.8;};
};
//
// zone "youku.com" IN {
// type forward;
// forward first;
// forwarders {202.195.144.6;202.195.144.8;};
// };
//
zone "youku.com" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
// forwarders {221.131.143.69;112.4.0.55;};
};
//
zone "ykimg.com" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
// forwarders {221.131.143.69;112.4.0.55;};
};
//
zone "soku.com" IN {
type forward;
forward first;
forwarders {114.114.114.114;8.8.8.8;};
// forwarders {221.131.143.69;112.4.0.55;};
};
// LOGGING
logging {
channel default_log {
file "/var/log/named.log" versions 10 size 1000m;
severity info;
print-time yes;
print-category yes;
};
category queries { default_log; };
category lame-servers { null; };
};
我的DNS服务器对于用户是递归的，当用户数少的时候，没有错误日志，但是当用户数多的时候就会产生错误。