Physical Interface not present in show ip route connected

Hi,
Thanks for reading my post.
I have a reccurent issue with a CISCO881-K9.
My WAN interface is regularly unsuable even if it's UP/UP. I can't even ping the interface from the router itself.
A reboot solves the issue. But now I have time and I'd like to get a proper understanding of what's going on.
The route doesn't appear in "show ip route connected".
Router#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0              unassigned      YES unset up                    up
FastEthernet1              unassigned      YES unset down                  down
FastEthernet2              unassigned      YES unset down                  down
FastEthernet3              unassigned      YES unset down                  down
FastEthernet4              X.Y.Z.82    YES NVRAM up                    up
Loopback0                  10.31.129.5     YES NVRAM up                    up
NVI0                       X.Y.Z.82    YES unset up                    up
Tunnel0                    10.32.129.1     YES NVRAM up                    down
Vlan1                      172.22.129.102 YES NVRAM up                    up
Router#ping X.Y.Z.82
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to X.Y.Z.82, timeout is 2 seconds:
Success rate is 0 percent (0/5)
Router#
Router#show ip route
Gateway of last resort is X.Y.Z.81 to network 0.0.0.0
S*    0.0.0.0/0 [1/0] via X.Y.Z.81
      10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
R        10.30.129.0/24 [120/1] via 172.22.129.101, 00:00:08, Vlan1
R        10.31.129.1/32 [120/1] via 172.22.129.101, 00:00:08, Vlan1
C        10.31.129.5/32 is directly connected, Loopback0
      172.22.0.0/16 is variably subnetted, 3 subnets, 2 masks
S        172.22.128.0/24 [1/0] via 172.28.28.254
C        172.22.129.0/24 is directly connected, Vlan1
L        172.22.129.102/32 is directly connected, Vlan1
      172.27.0.0/24 is subnetted, 1 subnets
S        172.27.0.0 [1/0] via 172.28.28.254
      172.28.0.0/24 is subnetted, 1 subnets
R        172.28.28.0 [120/2] via 172.22.129.101, 00:00:08, Vlan1
      172.30.0.0/24 is subnetted, 1 subnets
S        172.30.1.0 [1/0] via 172.28.28.254
      172.31.0.0/24 is subnetted, 1 subnets
S        172.31.0.0 [1/0] via 172.28.28.254
S     192.0.0.0/16 [1/0] via 172.28.28.254
      192.168.48.0/32 is subnetted, 1 subnets
S        192.168.48.247 [1/0] via 172.28.28.254
      192.168.84.0/32 is subnetted, 1 subnets
S        192.168.84.247 [1/0] via 172.28.28.254
S     192.168.101.0/24 [1/0] via 172.28.28.254
R     192.168.104.0/24 [120/2] via 172.22.129.101, 00:00:08, Vlan1
Router#show ip route connected
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override
Gateway of last resort is X.Y.Z.81 to network 0.0.0.0
      10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C        10.31.129.5/32 is directly connected, Loopback0
      172.22.0.0/16 is variably subnetted, 3 subnets, 2 masks
C        172.22.129.0/24 is directly connected, Vlan1
L        172.22.129.102/32 is directly connected, Vlan1
interface FastEthernet4
description WAN
ip address X.Y.Z.82 255.255.255.252
no ip proxy-arp
ip flow ingress
ip nat outside
ip virtual-reassembly in
ip tcp adjust-mss 1300
duplex full
speed 100
keepalive 3
crypto map MYSTREAM-MAP
hold-queue 224 in
end
Router#show interfaces fastEthernet 4
FastEthernet4 is up, line protocol is up
Hardware is PQII_PRO_UEC, address is 4403.a738.3c02 (bia 4403.a738.3c02)
Description: WAN
Internet address is X.Y.Z.82/30
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (3 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:06, output 00:00:35, output hang never
Last clearing of "show interface" counters never
Input queue: 0/224/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     26675 packets input, 1826301 bytes
     Received 12230 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     44029 packets output, 8969818 bytes, 0 underruns
     0 output errors, 0 collisions, 4 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     3 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Could you help on this? Or lead me to Tshoot that problem.
By the way the interface 4 is connected to an ISP Modem (TWC in US).
Thanks,
William

Hi,
Thanks for your answer. I've checked the release notes and there is no bug about that.
I think I must use the WAN interface which is fastethernet 4. I'm not able to change the patch cable for now.
What could be the cause?
show version
Cisco IOS Software, C880 Software (C880DATA-UNIVERSALK9-M), Version 15.1(4)M4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Wed 21-Mar-12 00:27 by prod_rel_team
ROM: System Bootstrap, Version 12.4(22r)YB5, RELEASE SOFTWARE (fc1)
Router uptime is 1 week, 3 hours, 6 minutes
System returned to ROM by reload at 08:12:54 UTC Fri Oct 3 2014
System restarted at 08:14:30 UTC Fri Oct 3 2014
System image file is "flash:c880data-universalk9-mz.151-4.M4.bin"
Last reload type: Normal Reload
Last reload reason: Reload Command
If you require further assistance please contact us by sending email to
[email protected]
Cisco 881 (MPC8300) processor (revision 1.0) with 236544K/25600K bytes of memory.
Processor board ID FGL1652265J
5 FastEthernet interfaces
1 Virtual Private Network (VPN) Module
256K bytes of non-volatile configuration memory.
125440K bytes of ATA CompactFlash (Read/Write)
License Info:
License UDI:
Device#   PID                   SN
*0        CISCO881-K9           FGL1652265J
License Information for 'c880-data'
    License Level: advsecurity   Type: Permanent
    Next reboot license Level: advsecurity
Configuration register is 0x2102

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