路由器怎么设防火墙

Question

我单位购置了一台万元以上的Cisco 2600路由器组成局域网，网内有50多台电脑，由于各室电脑没有杀毒软件和安全措施，导致经常性网络阻塞，只有重新开关路由器来解决，烦不胜烦。请高手指点：
1、如果在路由器上进行设置，网内主要是上网功能，如何设置防阻塞。
2、路由器如何设置，将网内电脑自动获取IP，请详细点
3、有没有必要购置硬件防火墙？
不胜感谢！

Answer 1

对于Cisco的防火墙设置基本上不是那么简单的

解答1，开启CBAC，配置嘛，确实很麻烦，不过确实是很有用。以下是我自己26的全配置，任何包含CBAC和inspect的部分都是有关防火墙的。CBAC定义审查的协议，ACL定义缺省阻塞的数据。具体最好参看Cisco文档。

Current configuration : 3448 bytes
!
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname C26VPDN
!
logging queue-limit 100
enable secret 5 $1$NcbN$W43qLePAdcJtYW/uFbeLr1
!
username ccie secret 5 $1$UH6z$.HRK55iOjXzxJQBnKYU2k/
clock timezone Beijing 8
aaa new-model
!
!
aaa authentication login xvty local
aaa authentication login nouse none
aaa session-id common
ip subnet-zero
no ip source-route
ip cef
!
!
no ip domain lookup
!
ip inspect one-minute high 1200
ip inspect one-minute low 800
ip inspect tcp max-incomplete host 150 block-time 0
ip inspect name CNC tcp
ip inspect name CNC udp
ip inspect name CNC icmp
ip audit notify log
ip audit po max-events 100
vpdn enable
!
vpdn-group CNC
request-dialin
protocol pppoe
!
!
!
!
!
!
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
mta receive maximum-recipients 0
!
!
!
!
interface Ethernet0/0
ip address 192.168.51.26 255.255.255.0
ip nat inside
full-duplex
pppoe enable
pppoe-client dial-pool-number 1
!
interface Serial1/0
no ip address
shutdown
no fair-queue
!
interface Serial1/1
no ip address
shutdown
!
interface Serial1/2
no ip address
shutdown
!
interface Serial1/3
no ip address
shutdown
!
interface Dialer1
mtu 1492
ip address negotiated
ip access-group CBAC in
ip nat outside
ip inspect CNC out
encapsulation ppp
dialer pool 1
dialer-group 1
ppp pap sent-username sy_xxxxx password 0 xxxxx
!
ip nat inside source list vpdn interface Dialer1 overload
ip nat inside source static tcp 192.168.51.101 32323 interface Dialer1 32323
ip nat inside source static udp 192.168.51.101 32323 interface Dialer1 32323
ip nat inside source static tcp 192.168.51.100 11111 interface Dialer1 11111
ip nat inside source static udp 192.168.51.100 11111 interface Dialer1 11111
ip nat inside source static udp 192.168.51.100 3333 interface Dialer1 3333
ip nat inside source static tcp 192.168.51.100 3333 interface Dialer1 3333
ip nat inside source static tcp 192.168.51.100 23232 interface Dialer1 23232
ip nat inside source static udp 192.168.51.100 23232 interface Dialer1 23232
ip nat inside source static udp 192.168.51.101 55555 interface Dialer1 55555
ip nat inside source static tcp 192.168.51.101 55555 interface Dialer1 55555
no ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
!
ip access-list standard vpdn
permit 192.168.51.0 0.0.0.255
ip access-list standard xvtyacl
permit 192.168.51.0 0.0.0.255
!
ip access-list extended CBAC
permit icmp any any echo-reply
permit icmp any any unreachable
permit icmp any any packet-too-big
permit icmp any any ttl-exceeded
permit icmp any any time-exceeded
permit tcp any any eq 55555
permit udp any any eq 55555
permit udp any any eq 32323
permit tcp any any eq 32323
permit tcp any any eq 3333
permit udp any any eq 3333
permit tcp any any eq 11111
permit udp any any eq 11111
permit tcp any any eq 23232
permit udp any any eq 23232
!
dialer-list 1 protocol ip permit
priority-list 1 protocol ip high tcp 3333
priority-list 1 protocol ip high udp 3333
priority-list 1 default low
!
radius-server authorization permit missing Service-Type
call rsvp-sync
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
!
!
line con 0
login authentication nouse
line aux 0
line vty 0 4
access-class xvtyacl in
login authentication xvty
!
ntp clock-period 17208481
ntp server 192.43.244.18
!
end

解答2，cisco的dhcp功能很恶心，推荐别用了。因为需要配置成 client-id对应"mac地址.02"……
解答3，Cisco的路由器就可以做防火墙了，就别卖别的根本没用的东西了。

不知道你是什么地方的人，如果是沈阳的，我可以上门免费帮你调试，别的地方的朋友就没有办法啦～～欢迎联系～

Answer 2

不用设置，一般路由器的内置防火墙在默认 配置下是打开的。不需要你进行特殊的设置，你只需要进行一些URL或者IP的过滤即可。如果没有特殊需要的话这些也不用设置的。