关于OpenWRT的DNS解析服务异常（缓慢或者超时无响应）的问题反馈 · Issue #9630 · coolsnowwolf/lede · GitHub

Q：是否搜索了issue (使用 "x" 选择)

A：内置的DNS解析服务偶尔会出现dns解析问题，反映在电脑或者手机上即浏览器提示DNS解析服务无响应或者网页加载异常（无图片和网站样式等）或者刷视频时视频或者评论等无法正常显示。目前测试会在P2P下载或者短时间内反复nslookup（1分钟内执行10-20次）时会出现上述情况，即短时较大量dns解析请求会触发dns拒绝服务。未开启TurboACC的DNS缓存时会出现上述状况，开启后出现上述状况的概率会小幅增加。尝试过去除TurboACC组件编译，上述状况依然会出现。已排除宽带问题。 自从1年半前开始接触openwrt，在此期间一直存在内置dns解析服务异常的问题，自用的两台d2550都会出现上述状况。

A：路由器型号：x86-64 实达 D2550 双千兆 固件版本：OpenWrt R22.6.16 / LuCI Master (git-22.168.62806-d59f9ce) 编译时config: 去掉很多自己用不到的luci-app-application，除必选外只选择了turboacc，samba，upnp，kms插件 也尝试过使用默认选项编译，但是依旧出现上述dns解析异常的问题

A：内核日志和系统日志在出现上述问题时并无相应的日志，不过有时出现dns解析异常时会有uhttpd的debug： Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: Plugin pppoe.so loaded. Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: PPPoE plugin from pppd 2.4.9 Wed Jun 22 06:00:00 2022 daemon.notice pppd[23462]: pppd 2.4.9 started by root, uid 0 Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: PPP session is 4126 Wed Jun 22 06:00:00 2022 daemon.warn pppd[23462]: Connected to 70:44:00:4f:ff:04 via interface eth1 Wed Jun 22 06:00:00 2022 kern.info kernel: [117031.749649] pppoe-wan: renamed from ppp0 Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: Renamed interface ppp0 to pppoe-wan Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: Using interface pppoe-wan Wed Jun 22 06:00:00 2022 daemon.notice pppd[23462]: Connect: pppoe-wan eth1 Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: syncppp not active Wed Jun 22 06:00:00 2022 daemon.info pppd[23462]: Remote message: Authentication Successful,Welcome! Wed Jun 22 06:00:00 2022 daemon.notice pppd[23462]: PAP authentication succeeded Wed Jun 22 06:00:00 2022 daemon.notice pppd[23462]: peer from calling number 70:44:00:4F:FF:04 authorized Wed Jun 22 06:00:01 2022 daemon.notice pppd[23462]: local IP address 100.106.80.241 Wed Jun 22 06:00:01 2022 daemon.notice pppd[23462]: remote IP address 100.106.0.1 Wed Jun 22 06:00:01 2022 daemon.notice pppd[23462]: primary DNS address 211.138.156.66 Wed Jun 22 06:00:01 2022 daemon.notice pppd[23462]: secondary DNS address 211.138.151.161 Wed Jun 22 06:00:01 2022 daemon.info avahi-daemon[1858]: Joining mDNS multicast group on interface pppoe-wan.IPv4 with address 100.106.80.241. Wed Jun 22 06:00:01 2022 daemon.info avahi-daemon[1858]: New relevant interface pppoe-wan.IPv4 for mDNS. Wed Jun 22 06:00:01 2022 daemon.info avahi-daemon[1858]: Registering new address record for 100.106.80.241 on pppoe-wan.IPv4. Wed Jun 22 06:00:01 2022 daemon.notice netifd: Network device 'pppoe-wan' link is up Wed Jun 22 06:00:01 2022 daemon.notice netifd: Interface 'wan' is now up Wed Jun 22 06:00:01 2022 user.notice firewall: Reloading firewall due to ifup of wan (pppoe-wan) Wed Jun 22 10:32:29 2022 daemon.err uhttpd[1734]: cat: can't open '/etc/bench.log': No such file or directory Wed Jun 22 10:32:29 2022 daemon.err uhttpd[1734]: cat: can't open '/etc/bench.log': No such file or directory Wed Jun 22 10:46:41 2022 daemon.err uhttpd[1734]: cat: can't open '/etc/bench.log': No such file or directory Wed Jun 22 10:47:24 2022 daemon.err uhttpd[1734]: cat: can't open '/etc/bench.log': No such file or directory Wed Jun 22 10:48:11 2022 authpriv.info dropbear[4453]: Child connection from 192.168.1.244:7003 Wed Jun 22 10:48:13 2022 authpriv.warn dropbear[4453]: Bad password attempt for 'root' from 192.168.1.244:7003 Wed Jun 22 10:48:16 2022 authpriv.notice dropbear[4453]: Password auth succeeded for 'root' from 192.168.1.244:7003 Wed Jun 22 10:48:49 2022 authpriv.info dropbear[4453]: Exit (root) from : Disconnect received