Some colleagues complained to me slow online recently,they said that they nearly couldn't tolerate when they open a webside need to refresh many times.So i response for solving the problem.Generally speaking,The fist step is PING the Operators gateway, that's no evidence to find some problem, then I ping baidu and sina,it is much dely time.and the tracert method also prove it.

    So i call the Oprators and ask for check the network.After one hour they relpy me their network is OK,So I guess the prolem maybe happen in the intranet.then i check the DNS,I find the DNS response timeout through nslookup,and the second DNS 8.8.8.8 also isn't available,So i change a DNS to liantong in localhost,so the delay time obvious get down.

103821594.png

   Due to find the problem,I can solve the problem, first,I login into DNS server ,reboot services of DNS server.and through test it is OK,and modify the switch,change the DHCP strategy,and all is compelete.


#dis cur
dhcp server ip-pool vlan1
 network 192.168.1.0 mask 255.255.255.0
 gateway-list 192.168.1.1
 dns-list 192.168.1.5 202.106.0.20
 expired day 0 hour 4