一个CISCO2611拨号的问题

west-mail

一个酒厂，下边分厂通过拨号定时向总部传送数据．总部ＣＩＳＣＯ２６１１配置如下：
PiJiuChang#sh run
Building configuration...

Current configuration : 1472 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname PiJiuChang
!
enable secret 5 $1$gWPd$53PY8yNhMhCbMjDalik5q0
!
username 111 password 0 111
username xpcw password 0 xpcw
ip subnet-zero
!
!
!
!
!
!
interface Loopback0
ip address 192.168.1.254 255.255.255.255
!
interface FastEthernet0/0
description connect to banchs
ip address 192.168.160.254 255.255.255.0
duplex auto
speed auto
no cdp enable
!
interface FastEthernet0/1
description connect to xjgd
no ip address
speed 10
full-duplex
no cdp enable
!
interface Async65
ip unnumbered Loopback0
encapsulation ppp
ip tcp header-compression passive
no ip mroute-cache
async mode dedicated
peer default ip address pool pool
ppp authentication pap
!
interface Group-Async1
ip unnumbered Loopback0
encapsulation ppp
no ip mroute-cache
async mode dedicated
peer default ip address pool pool
ppp authentication pap
group-range 33 40
!
ip local pool pool 192.168.16.180 192.168.16.250
ip classless
no ip http server
no ip pim bidir-enable
!
!
access-list 1 permit 192.168.160.0 0.0.0.255
no cdp run
!
line con 0
exec-timeout 0 0
logging synchronous
line 33 40
modem InOut
modem autoconfigure discovery
transport input all
stopbits 1
flowcontrol hardware
line aux 0
modem InOut
modem autoconfigure discovery
transport input all
stopbits 1
speed 38400
flowcontrol hardware
line vty 0 4
password hengsy
login
!
!
end


现在如果下边拨号用户自动获取的ＩＰ为１９２．１６８．１６．１８０，则在路由器上或是内部服务器上都能ＰＩＮＧ到该用户．但如果用户自动获取的ＩＰ为１９２．１６８．１６．１８１，则只能是该用户能ＰＩＮＧ通路由器和内部服务器，而在路由器上或是内部服务器上均无法ＰＩＮＧ到该用户．但ＳＨＯＷ　ＩＰ　ＲＯＵＴＥ均能看到一条新增路由．
哪位大侠给予指点迷津，小弟先谢了！