A company use USG2205BSR as gateway to connect the network external. PC of Internal network connect the internet by fix IP address. Configure manually the DNS which supplied by the Network Market Makers, found out that PC of Internal network visit the www.zaobao.com is very slow, but visit the others sites normally. The network topo is as follows:
1 Open the DNS in USG2205BSR, Address of DNS should be the same with the Internal network PC’s.
2 In another network environment, ping www.zaobao.com， TTL=50
3 Ping www.baidu，www.sina.com,delay less than 60ms, ping www.zaobao.com， TTL=300
4 So, the problem is related to the DNS, the problem has been solved after the replacing of the DNS.
Induced by the DNS resolution, change the DNS.