? ? ?

r6#sh running-config interface fastEthernet 0/0
Building configuration...

Current configuration : 98 bytes
!
interface FastEthernet0/0
ip address 150.100.113.6 255.255.252.0
duplex auto
speed auto
end

略

r6#sh ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 150.100.113.6 YES NVRAM up up
Multilink1 150.100.12.6 YES NVRAM up up

ICMP packet debugging is on
r6#
*Mar 1 01:19:11.047: ICMP: echo reply sent， src 150.100.113.6， dst 150.100.12.9
*Mar 1 01:19:11.067: ICMP: echo reply sent， src 150.100.113.6， dst 150.100.12.9
*Mar 1 01:19:11.091: ICMP: echo reply sent， src 150.100.113.6， dst 150.100.12.9
*Mar 1 01:19:11.111: ICMP: echo reply sent， src 150.100.113.6， dst 150.100.12.9
*Mar 1 01:19:11.135: ICMP: echo reply sent， src 150.100.113.6， dst 150.100.12.9
r6#

---------------------------------------------------------------------

r9#sh ip route
Codes: C - connected， S - static， R - RIP， M - mobile， B - BGP
D - EIGRP， EX - EIGRP external， O - OSPF， IA - OSPF inter area
N1 - OSPF NSSA external type 1， N2 - OSPF NSSA external type 2
E1 - OSPF external type 1， E2 - OSPF external type 2
i - IS-IS， su - IS-IS summary， L1 - IS-IS level-1， L2 - IS-IS level-2
ia - IS-IS inter area， * - candidate default， U - per-user static route
o - ODR， P - periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/24 is subnetted， 1 subnets
C 10.10.9.0 is directly connected， Loopback0
150.100.0.0/16 is variably subnetted， 4 subnets， 3 masks
R 150.100.112.0/22 [120/1] via 150.100.12.6， 00:00:09， Multilink1
C 150.100.1.0/24 is directly connected， Ethernet0/0
C 150.100.12.6/32 is directly connected， Multilink1
C 150.100.12.0/24 is directly connected， Multilink1
r9#ping 150.100.113.6

Type escape sequence to abort.
Sending 5， 100-byte ICMP Echos to 150.100.113.6， timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5)， round-trip min/avg/max = 20/20/20 ms

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150.100.113.0/22 が　150.100.112.0/22　になってる。