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258
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30
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7
Replies

ISR4331 can't even ping itself

simon connell
Beginner
Beginner

Hi, I have a lot of experience with 2800s and 2900s, but as these are obsolete recently bought an ISR4331.  I can't get the new router to do anything!  I've configured Gi0/0/0 and Gi0/0/1 with IPs, and the router won't even ping its own IP addresses.  Snooping on these ports with a laptop shows one gratuitous ARP when the cable is connected, but nothing after that, and of course they don't respond in any way.  The ARP table never shows anything other than its own two interfaces.

Am I doing something fundamentally wrong?

I'm completely stumped and the fans on this thing are driving me insane!!

Interface config:

interface GigabitEthernet0/0/0
description Process-Engineering DMZ
ip address 10.0.10.2 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
negotiation auto
!
interface GigabitEthernet0/0/1
description Process Network
ip address 172.20.254.254 255.255.0.0
no ip redirects
no ip unreachables
no ip proxy-arp
negotiation auto

 

sh int gi0/0/0

 

GigabitEthernet0/0/0 is up, line protocol is up
Hardware is ISR4331-3x1GE, address is 806a.006b.a6c0 (bia 806a.006b.a6c0)
Description: Process-Engineering DMZ
Internet address is 10.0.10.2/24
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is auto, media type is RJ45
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:01:19, output 00:00:20, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (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
226 packets input, 28524 bytes, 0 no buffer
Received 107 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 119 multicast, 0 pause input
3 packets output, 491 bytes, 0 underruns
Output 2 broadcasts (0 IP multicasts)
0 output errors, 0 collisions, 1 interface resets
93 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

I'm very grateful for any help or advice!

1 Accepted Solution

Accepted Solutions

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

post the full running configuration

(sh run) 

of the router. Maybe 'ip routing' is disabled for some reason (I am not sure if it actually can be disabled, but in any case, try 'ip routing' in global config mode)...

View solution in original post

7 Replies 7

hard to answer, 


show ip route 

are you see the IP interface in table ?

balaji.bandi
VIP Community Legend VIP Community Legend
VIP Community Legend

is this new Router or used one ? can you post - 

show version and show ip route

can you connect console and reload and post complete boot process

have you tried default the interface to factory

 

default  interface GigabitEthernet0/0/0
!
interface GigabitEthernet0/0/0
ip address 10.0.10.2 255.255.255.0

no shutdown

!

and test ? ( i am sure you may have done this, just checking with basic troubleshoot before we look something else)

Are you running any routing protocol like ospf  ?

 

 

BB

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Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

post the full running configuration

(sh run) 

of the router. Maybe 'ip routing' is disabled for some reason (I am not sure if it actually can be disabled, but in any case, try 'ip routing' in global config mode)...

simon connell
Beginner
Beginner

Thanks for all the responses!  I believe it is sorted now!!  For the benefit of anyone with similar problems:

It's a new router, although it was bought a few months ago I've only just got around to powering it up.  The config is very minimal beyond the default.

sh ip route:

 

Default gateway is not set

Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty

After putting 'ip routing' in the config as Georg suggested the interfaces are now shown in the routing table and ping works!

Thanks everyone, you've saved much banging of my head against the desk!

always try solve any routing issue with 


show ip route 

 

sure that was my suspect that is the reason asked

show ip route 

---any way good to know you able to resolve the issue.

most time this should come as default in latest code - other reason asked

show version 

too

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Just for reference,

show version:
Cisco IOS XE Software, Version 17.05.01a
Cisco IOS Software [Bengaluru], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 17.5.1a, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2021 by Cisco Systems, Inc.
Compiled Sun 11-Apr-21 17:15 by mcpre
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