A user PC is connected to a metropolitan area network (MAN) through a switch and a NE40 router. The Network Address Translation (NAT) service is running on a NAT board of the NE40. The user PC sometimes fails to open web pages.
1. Check the bandwidth of the user PC. The user PC uses a Gigabit Ethernet uplink. Its download speed is very fast.
2. Log in to a web site that the user previously failed to access from another test site. The web page is opened quickly.
3. Check on the NE40. The service class is set to 2 when NAT (in PAT mode) is performed; the allowed maximum number of links (MaxLinks) is 100 and all the links are occupied. This is why the user PC opens web pages very slowly or cannot open web pages at all. Change the service class to 8. The allowed maximum number of links is changed to 65535. Then, the user PC can access web sites normally.
dis nat users
Connections count of nat board 1:
PoolIndex Vpn-instance SrcIP CurrentLinks MaxLinks
0 * 10.19.116.4 95 100
0 * 10.19.123.35 100 100
1. The bandwidth allocated to the user PC is insufficient.
2. The web sites the user try to access are experiencing technical problems, or the domain name server (DNS) is faulty.
3. The NAT service configuration is incorrect.