| Cisco 800 Router stops responding after internet goes down Hi,
This has been a problem since day one. IOS version is 15.0 which came with the router.
Ethernet4 interface is configured with a static IP and netmask to our Cable ISP provider. Everything works perfectly until the ISP goes down then comes back. Unfortunately the Cisco router stops working after that.
The cable company says they can see the interface is plugged in but they get no response. No traffic in or out. Only thing that corrects it is a router reboot. The connection does not go down very often so it has not been a serious problem. I'd like to get to the bottom of it though and fix it.
I configured the router using Cisco Configuration Pro since I don't deal with Cisco routers that often and can't be bothered to learn cisco command line configuration. Here is the running config for Ethernet4 with public static IP replaced with xx.
interface FastEthernet4
description $ES_WAN$$ETH-WAN$$FW_OUTSIDE$
ip address xx.xx.xx.xx 255.255.252.0
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip verify unicast reverse-path
ip flow ingress
ip nat outside
ip inspect CCP_LOW out
ip virtual-reassembly
duplex auto
speed auto
! |
|
Reviews:
 ·Nexicom
| A couple things:
1. Post the entire config please.
2. What kind of bandwidth do you have? I've found the limit in the 861 to be ~38Mbit through NAT with a naked config. Just from what I'm seeing, your config has a lot more going on...
3. Do you have SmartNET? They are DIRT CHEAP for an 800-series router, and would allow you to grab the latest IOS image from Cisco's site which will likely resolve your problem. |
|
| We had smartnet and that was the latest firmware up until the time our smartnet expired last year. I sort of doubt a firmware upgrade will fix this anyways.
Here is the entire anonymized (crypt key removed also) config.
version 15.0
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service sequence-numbers
!
hostname router1
!
boot-start-marker
boot-end-marker
!
security authentication failure rate 3 log
security passwords min-length 6
logging buffered 51200 warnings
logging console critical
enable secret 5 $1$oLZp$L3AFtDgVUQrvbreslvvMPNE0
!
no aaa new-model
!
!
!
memory-size iomem 10
clock timezone PCTime -8
clock summer-time PCTime date Apr 6 2003 2:00 Oct 26 2003 2:00
!
crypto pki trustpoint TP-self-signed-211092880
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-211092880
revocation-check none
rsakeypair TP-self-signed-211092880
!
!
crypto pki certificate chain TP-self-signed-211092880
certificate self-signed 01
.
.
.
.
F4BE2A31 BB495172 9A6FDB3A 8A10
quit
no ip source-route
!
!
ip dhcp excluded-address 192.168.10.1 192.168.10.99
ip dhcp excluded-address 192.168.10.201 192.168.10.254
!
ip dhcp pool ccp-pool1
import all
network 192.168.10.0 255.255.255.0
dns-server 192.168.10.20 208.67.222.222
default-router 192.168.10.1
netbios-name-server 192.168.10.20 192.168.10.30
lease 5 2
!
!
ip cef
no ip bootp server
ip domain name somedomain.com
ip name-server 192.168.10.20
ip name-server 192.168.10.30
ip name-server 208.67.222.222
ip name-server 208.67.220.220
ip name-server xx.xx.xx.xx
ip name-server xx.xx.xx.xx
ip inspect name CCP_LOW cuseeme
ip inspect name CCP_LOW dns
ip inspect name CCP_LOW ftp
ip inspect name CCP_LOW h323
ip inspect name CCP_LOW sip
ip inspect name CCP_LOW https
ip inspect name CCP_LOW icmp
ip inspect name CCP_LOW imap
ip inspect name CCP_LOW pop3
ip inspect name CCP_LOW netshow
ip inspect name CCP_LOW rcmd
ip inspect name CCP_LOW realaudio
ip inspect name CCP_LOW rtsp
ip inspect name CCP_LOW esmtp
ip inspect name CCP_LOW sqlnet
ip inspect name CCP_LOW streamworks
ip inspect name CCP_LOW tftp
ip inspect name CCP_LOW tcp
ip inspect name CCP_LOW udp
ip inspect name CCP_LOW vdolive
login block-for 100 attempts 15 within 100
login delay 1
no ipv6 cef
!
!
multilink bundle-name authenticated
license udi pid CISCO881-SEC-K9 sn xxxxxxxx
!
!
username xxxxx privilege 15 secret 5 $1$Ruro$Zd5PdprGKTr5pvTMNzdv6p.
!
!
ip tcp synwait-time 10
ip ssh time-out 60
ip ssh authentication-retries 2
!
!
!
!
!
!
!
interface FastEthernet0
!
!
interface FastEthernet1
!
!
interface FastEthernet2
!
!
interface FastEthernet3
!
!
interface FastEthernet4
description $ES_WAN$$ETH-WAN$$FW_OUTSIDE$
ip address 24.67.xx.xx 255.255.252.0
ip access-group 101 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip verify unicast reverse-path
ip flow ingress
ip nat outside
ip inspect CCP_LOW out
ip virtual-reassembly
duplex auto
speed auto
!
!
interface Vlan1
description $ETH-SW-LAUNCH$$INTF-INFO-HWIC 4ESW$$ES_LAN$$FW_INSIDE$
ip address 192.168.10.1 255.255.255.0
ip access-group 100 in
ip flow ingress
ip flow egress
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1452
!
!
ip forward-protocol nd
ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
ip flow-top-talkers
top 20
sort-by bytes
!
ip nat inside source list 1 interface FastEthernet4 overload
ip nat inside source static tcp 192.168.10.30 1723 interface FastEthernet4 1723
ip nat inside source static tcp 192.168.10.10 6000 interface FastEthernet4 6000
ip nat inside source static udp 192.168.10.10 6000 interface FastEthernet4 6000
ip nat inside source static udp 192.168.10.10 9000 interface FastEthernet4 9000
ip nat inside source static udp 192.168.10.10 9001 interface FastEthernet4 9001
ip nat inside source static tcp 192.168.10.10 30000 interface FastEthernet4 30000
ip nat inside source static tcp 192.168.10.10 30001 interface FastEthernet4 30001
ip nat inside source static tcp 192.168.10.10 5003 interface FastEthernet4 5003
ip nat inside source static udp 192.168.10.10 5003 interface FastEthernet4 5003
ip nat inside source static tcp 192.168.10.10 5090 interface FastEthernet4 5090
ip nat inside source static udp 192.168.10.10 5090 interface FastEthernet4 5090
ip nat inside source static tcp 192.168.10.10 443 interface FastEthernet4 4433
ip nat inside source static tcp 192.168.10.10 6001 interface FastEthernet4 6001
ip nat inside source static udp 192.168.10.10 6001 interface FastEthernet4 6001
ip nat inside source static tcp 192.168.10.10 21 interface FastEthernet4 221
ip nat inside source static tcp 192.168.10.20 443 interface FastEthernet4 443
ip route 0.0.0.0 0.0.0.0 24.67.xx.xx permanent
!
!
access-list 1 remark INSIDE_IF=Vlan1
access-list 1 remark CCP_ACL Category=2
access-list 1 permit 192.168.10.0 0.0.0.255
access-list 100 remark auto generated by CCP firewall configuration
access-list 100 remark CCP_ACL Category=1
access-list 100 deny ip 24.67.xx.xx 0.0.3.255 any
access-list 100 deny ip host 255.255.255.255 any
access-list 100 deny ip 127.0.0.0 0.255.255.255 any
access-list 100 permit ip any any
access-list 101 remark auto generated by CCP firewall configuration
access-list 101 remark CCP_ACL Category=1
access-list 101 permit tcp any host 24.67.xx.xx eq 4433
access-list 101 permit tcp any host 24.67.xx.xx eq 223
access-list 101 permit udp any host 24.67.xx.xx eq 5090
access-list 101 permit tcp any host 24.67.xx.xx eq 5090
access-list 101 permit udp any host 24.67.xx.xx eq 5003
access-list 101 permit tcp any host 24.67.xx.xx eq 5003
access-list 101 permit tcp any host 24.67.xx.xx eq 30001
access-list 101 permit tcp any host 24.67.xx.xx eq 30000
access-list 101 permit udp any host 24.67.xx.xx eq 9001
access-list 101 permit udp any host 24.67.xx.xx eq 9000
access-list 101 permit udp any host 24.67.xx.xx eq 6000
access-list 101 permit tcp any host 24.67.xx.xx eq 6000
access-list 101 permit gre any host 24.67.xx.xx
access-list 101 permit tcp any host 24.67.xx.xx eq 1723
access-list 101 permit tcp any host 24.67.xx.xx eq 3389
access-list 101 permit udp host 64.59.xx.xx eq domain host 24.67.xx.xx
access-list 101 permit udp host 64.59.xx.xx eq domain host 24.67.xx.xx
access-list 101 permit udp host 208.67.220.220 eq domain host 24.67.xx.xx
access-list 101 permit udp host 208.67.222.222 eq domain host 24.67.xx.xx
access-list 101 deny ip 192.168.10.0 0.0.0.255 any
access-list 101 permit icmp any host 24.67.xx.xx echo-reply
access-list 101 permit icmp any host 24.67.xx.xx time-exceeded
access-list 101 permit icmp any host 24.67.xx.xx unreachable
access-list 101 permit tcp any host 24.67.xx.xx eq 443
access-list 101 permit tcp any host 24.67.xx.xx eq www
access-list 101 permit tcp any host 24.67.xx.xx eq 22
access-list 101 permit tcp any host 24.67.xx.xx eq cmd
access-list 101 permit tcp any host 24.67.xx.xx eq 4443
access-list 101 deny ip 10.0.0.0 0.255.255.255 any
access-list 101 deny ip 172.16.0.0 0.15.255.255 any
access-list 101 deny ip 192.168.0.0 0.0.255.255 any
access-list 101 deny ip 127.0.0.0 0.255.255.255 any
access-list 101 deny ip host 255.255.255.255 any
access-list 101 deny ip host 0.0.0.0 any
access-list 101 deny ip any any log
no cdp run
!
!
!
!
!
control-plane
!
!
banner exec ^CC
% Password expiration warning.
-----------------------------------------------------------------------
Cisco Configuration Professional (Cisco CP) is installed on this device
and it provides the default username "cisco" for one-time use. If you have
already used the username "cisco" to login to the router and your IOS image
supports the "one-time" user option, then this username has already expired.
You will not be able to login to the router with this username after you exit
this session.
It is strongly suggested that you create a new username with a privilege level
of 15 using the following command.
username privilege 15 secret 0
Replace and with the username and password you
want to use.
-----------------------------------------------------------------------
^C
banner login ^CCAuthorized access only!
Disconnect IMMEDIATELY if you are not an authorized user!^C
!
line con 0
login local
no modem enable
transport output telnet
line aux 0
login local
transport output telnet
line vty 0 4
privilege level 15
login local
transport input telnet ssh
!
scheduler max-task-time 5000
scheduler allocate 4000 1000
scheduler interval 500
end |
|
|
|
| reply to powerpbx
You'd be surprised.
I had an 867 that would randomly lose the DSL interface after a few weeks. An updated image fixed it.
I don't see anything glaringly wrong with your config.
Can you do an sh ver? |
|
| router1#sh ver
Cisco IOS Software, C880 Software (C880DATA-UNIVERSALK9-M), Version 15.0(1)M4, R
ELEASE SOFTWARE (fc1)
Technical Support: »www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Fri 29-Oct-10 00:02 by prod_rel_team
ROM: System Bootstrap, Version 12.4(22r)YB5, RELEASE SOFTWARE (fc1) |
|
| reply to powerpbx
Yeah, that's pretty old, I'd recommend trying:
c880data-universalk9-mz.151-4.M3.bin
If it doesn't fix it, you can open a TAC case with Cisco, since you'd have SmartNET. |
|
| Ok I guess that is what we will do. Thanks for the help. |
|
jh2010
join:2009-09-03
Brooklyn, NY | reply to powerpbx
15.2(2)T works well on my 881. |
|
| reply to powerpbx
ios 15.0 is heavily buggy... the least version for any IOS 15.x should be 15.1 |
|
Reviews:
·Nexicom
| said by Da Geek Kid:ios 15.0 is heavily buggy... the least version for any IOS 15.x should be 15.1
Agreed.
I think it was nosx who stated that every release has a huge list of bugs. You just choose the one with the least applicable bugs to your application  |
|
| more and more I begin to think that 15.x is a Windows OS... It's pretty much like a swiss cheese. |
|
| reply to powerpbx
I put on c880data-universalk9-mz.151-4.M3.bin last night. I think that fixed my problem. I can unhook the WAN cable for several minutes and it will start working when I put the cable back in now.
One question about firmware updates. Do I need to keep the:
boot system flash
boot system flash c880data-universalk9-mz.151-4.M3.bin
Statement in my running config? Some documentation mentioned adding that and some didn't. Only way I could get the router to boot into the new firmware image was to delete the old image so the boot system flash statement didn't seem to make a difference. |
|
| Unless you're booting multiple images and/or are security conscious of people fiddling with what
IOS boots, then no you don't need it. My humble 00000010bits anyways.
Regards |
|
| reply to powerpbx
We have an 871 that does that. Have to telnet in on the lan side and shut then no shut fa4. May be software or hardware but doesn't matter as they usually only last a year at the location due to heavy lightning. The one before it had no problems but was an older ios. |
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