多个路由器相连后，设置了静态路由，两台PC能通，但ping中间IP出现 Destination host unreachable.，为什

R1路由器show run：
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.2.1 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.4.0 255.255.255.0 192.168.2.2

R2路由器show run：
interface FastEthernet0/0
ip address 192.168.3.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.2.2 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.4.0 255.255.255.0 192.168.3.2
ip route 192.168.1.0 255.255.255.0 192.168.2.1
!
R3路由器show run：
interface FastEthernet0/0
ip address 192.168.3.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.4.1 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 192.168.1.0 255.255.255.0 192.168.3.1

PC1能ping通PC2，但ping 3.1 3.2时提示：
PC>ping 192.168.3.2

Pinging 192.168.3.2 with 32 bytes of data:

Reply from 192.168.1.1: Destination host unreachable.

PC2 ping PC1能通 只是ping 2.2 2.1 时跟上面的提示一样 Destination host unreachable.

是什么原因？应该所以地址都能ping通的啊

静态路由设置错了啊，R1没设置192.168.3.0/24的路由肯定不通的，其他路由器静态路由都要相应改变
R1静态路由：
ip route 192.168.4.0 255.255.255.0 192.168.2.2
ip route 192.168.3.0 255.255.255.0 192.168.2.2
R2静态路由：
ip route 192.168.1.0 255.255.255.0 192.168.2.1
ip route 192.168.4.0 255.255.255.0 192.168.3.2
R3静态路由：
ip route 192.168.2.0 255.255.255.0 192.168.3.1
ip route 192.168.1.0 255.255.255.0 192.168.3.1

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