出现的问题是，远程工作站拨号后得到的IP信息是：
地址：172.16.56.245
子网掩码：255.255.255.255
网关：172.16.56.245
网关和IP地址一样，但实际上需要的或者说正确的信息应该是：
地址：172.16.56.245
子网掩码：255.255.255.0
网关：172.16.56.254
无法访问网络中心的服务器172.16.56.2

请大家帮忙看看问题出在哪里？
下面是show running-config的信息：

Router#show run
Building configuration...

Current configuration : 1239 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$A1Uk$L6b8FeFI5yG6P2qxEt9cv1
enable password cisco
!
username cisco password 0 cisco
modem country microcom_hdms china
no aaa new-model
ip subnet-zero
no ip routing
!
!
!
no ftp-server write-enable
!
!
!
!
interface FastEthernet0/0
no ip address
no ip route-cache
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.16.56.253 255.255.255.0
no ip route-cache
speed auto
full-duplex
no cdp enable
no mop enabled
!
interface Group-Async1
ip unnumbered FastEthernet0/1
encapsulation ppp
async default routing
async mode interactive
peer default ip address pool cisco
ppp authentication pap
group-range 33 40
!
ip local pool cisco 172.16.56.245 172.16.56.252
ip default-gateway 172.16.56.254
ip classless
ip http server
!
snmp-server community public RO
snmp-server community handan RW
snmp-server enable traps tty
!
line con 0
line 33 40
script dialer cisco-default
modem InOut
modem autoconfigure discovery
transport input all
autoselect ppp
line aux 0
line vty 0 4
password cisco
login
!
!
!
end