BDCOM2621配置有何问题？

云中飘

首先说问题吧，打开路由器上网正常，但一分钟过后，局域网正常，但无法上互联网！重启故障依旧，好不了一分钟。详细配置如下：
szpt#show run
Building configuration...

Current configuration:
!
!version 1.3.1N
service timestamps log date
service timestamps debug date
no service password-encryption
!
hostname szp
!
!
!
username szzx password 0 szp
!
aaa authentication login default local enable
enable password 0 szp
!
!
!
interface FastEthernet0/0
ip address 19.13.24.2 255.255.255.0
no ip directed-broadcast
ip nat outside
!
interface FastEthernet0/1
ip address 10.0.0.2 255.255.255.0
no ip directed-broadcast
ip access-group firewall in
ip nat inside
!
interface Serial0/2
no ip address
no ip directed-broadcast
!
interface Serial0/3
no ip address
no ip directed-broadcast
!
interface Async0/0
no ip address
no ip directed-broadcast
!
!
ip route default 19.13.24.1
!
!
!
!
!
!
gateway-cfg
shutdown
!
!
ip access-list standard NAT
permit 10.0.0.0 255.255.255.0
!
ip access-list extended firewall
deny   tcp any any eq 135
deny   tcp any any eq 139
deny   tcp any any eq 445
deny   tcp any any eq 3333
deny   tcp any any eq 593
deny   udp any any eq 135
deny   udp any any eq tftp
deny   udp any any eq 4444
deny   udp any any eq 137
deny   udp any any eq 138
permit ip any any
!
!
ivr-cfg
!
!
!
ip dhcpd pool sz1
network 10.0.0.0 255.255.255.0
range 10.0.0.3 10.0.0.100
domain-name sz
default-router 10.0.0.2
dns-server 202.103.44.5
lease 1 0 0
!
ip dhcpd enable
!
!
!
ip nat translation max-links all 200
ip nat inside source list NAT interface FastEthernet0/0
!
!
!
szpt#





还请高手们分析一二，是否网内流量过大还是内网中有病毒？跪谢！

ssffzz1

1、收集故障时的路由器CPU和MEMORY信息，还有接口流量信息。还有ARP表。
2、故障时内网和路由器是否可以通讯，内网PC的ARP表是否正确。