【AR18宽带路由器NAT+QoS典型应用和配置】分享给互联网从爱好者学习参考。
应用说明
目标：在AR1830上同时启用NAT和QOS，从PC1发送的数据流定义为Gold（优先级为5），至少要保证50％的ADSL带宽；从PC2发送的数据流定义为multimedia(优先级3)，至少要保证20％的ADSL带宽；网管(优先级7)要保证10%带宽，但是在网络不忙的时候，各个数据流都可以超过自己所定义的带宽。
实现：首先是在以太网入口上,对Gold，Multimedia做识别并打IP-precedence,对于网管流量,配置classifier来匹配源地址是Lo0口的数据包,然后在上行口(adsl口)先配置car来打IP-precedence,并同时配置EF队列保证优先转发。对在以太网入口打过IP-precedence的Multimedia和gold流,在上行口上做AF队列来保证带宽。 这里要注重的一点是,在出接口上要么只能配置百分比带宽,要么只能配置指定数字带宽,不能如客户要求的那样配置成既有百分比又有数据带宽（如25%/25%/16K）,所以需要预先知道上行带宽,然后自己计算一下,再确认是配置成百分比还是数字带宽。
另外，ADSL接口的QoS带宽根据国际标准均为640bps。
组网图
注重事项
1、 QoS CBQ只能应用在ATM接口的PVC下，不可以直接用在ATM接口或Dialer口；
具体配置
AR18-30（PPPoE Client）配置：
dis cur
#
sysname Router
#
dialer-rule 1 ip permit
#
traffic classifier gold operator and
if-match ip-precedence 5
traffic classifier snmp operator and
if-match acl 3003
traffic classifier multimedia operator and
if-match ip-precedence 3
#
traffic behavior gold
queue af bandwidth pct 50
traffic behavior snmp
queue af bandwidth pct 10
traffic behavior multimedia
queue af bandwidth pct 20
#
qos policy policy1
classifier multimedia behavior multimedia
classifier gold behavior gold
classifier snmp behavior snmp
#
interface Dialer1
link-protocol ppp
mtu 1450
ip address ppp-negotiate
dialer user test
dialer-group 1
dialer bundle 1
nat outbound 3000
#
interface Ethernet1/0
ip address 202.150.1.31 255.255.255.0
qos car inbound acl 3001 cir 100000000 cbs 100000000 ebs 0 green remark-prec-pa
ss 5 red remark-prec-pass 5
qos car inbound acl 3002 cir 100000000 cbs 100000000 ebs 0 green remark-prec-pa
ss 3 red remark-prec-pass 3
#
interface Atm2/0
pvc 4/33
map bridge Virtual-Ethernet1
qos reserved-bandwidth pct 100
qos apply policy policy1 outbound
qos car outbound acl 3003 cir 16000 cbs 15000 ebs 0 green remark-prec-pass 7 re
d remark-prec-pass 7
#
interface Virtual-Ethernet1
pppoe-client dial-bundle-number 1
#
interface NULL0
#
interface LoopBack0
ip address 202.150.10.1 255.255.255.255
#
acl number 3000
rule 0 permit ip source 202.150.1.0 0.0.0.255
rule 1 deny ip
acl number 3001
rule 0 permit ip source 202.150.1.1 0
acl number 3002
rule 0 permit ip source 202.150.1.2 0
acl number 3003
rule 0 permit ip source 202.150.10.1 0
#
ip route-static 0.0.0.0 0.0.0.0 Dialer 1 preference 60
#
user-interface con 0
idle-timeout 0 0
user-interface vty 0 4
authentication-mode none
user privilege level 3
#
return
AR4640（PPPoE Server）配置：
dis cur
#
sysname AR46-40
#
local-user test passWord simple test
#
ip pool 143 202.143.1.100 202.143.1.200
#
interface Virtual-Template33
ppp authentication-mode pap scheme default
ppp accounting scheme default
ip address 202.143.1.46 255.255.255.0
remote address pool 143
#
interface Aux0
async mode flow
