H3C MSR20-20 路由器自动获取的部分IP地址访问互联网受限，不能上网

单位的电脑都连接到一台交换机上，交换机连接到路由器上，路由器 通过网通宽带连接到因特网。路由器开启DHCP功能，电脑能获取IP地址，但是大多数获取的IP都不能上网，极少数能上外网，不能上外网的提示上网受限，显示感叹号，手动指定IP地址，不见得换到哪个就能上外网。受限的电脑能ping到路由器或登陆路由器，网络是通的，就是不让访问外网。不知什么原因。下面是路由器的配置，请指点。

 # version 5.20, Release 2207P02, Basic # sysname H3C # nat address-group 1 42.53.137.50 42.53.137.51 # domain default enable system # dar p2p signature-file cfa0:/p2p_default.mtd # port-security enable # acl number 3000 rule 0 permit ip # vlan 1 # domain system access-limit disable state active idle-cut disable self-service-url disable # dhcp server ip-pool 1 network 192.168.1.0 mask 255.255.255.0 gateway-list 192.168.1.1 dns-list 202.96.69.38 # user-group system group-attribute allow-guest # local-user admin password cipher .]@USE=B,53Q=^Q`MAF4<1!! authorization-attribute level 3 service-type telnet service-type web # interface Aux0 async mode flow link-protocol ppp # interface Cellular0/0 async mode protocol link-protocol ppp # interface Ethernet0/0 port link-mode route ip address 192.168.1.1 255.255.255.0 # interface Ethernet0/1 port link-mode route nat outbound 3000 address-group 1 nat server 2 protocol udp global current-interface 23458 inside 192.168.1.200 23458 nat server 3 protocol tcp global current-interface 8099 inside 192.168.1.200 8080 nat server 1 protocol tcp global current-interface 8098 inside 192.168.1.190 8000 ip address 42.53.137.50 255.255.255.252 # interface Serial1/0 link-protocol ppp # interface NULL0 # ip route-static 0.0.0.0 0.0.0.0 42.53.137.49 # dhcp enable # load xml-configuration # user-interface con 0 user-interface tty 13 user-interface aux 0 user-interface vty 0 4 authentication-mode scheme # return