Solved

Cisco 2960 Telnet Issue

Posted on 2009-06-29
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2,235 Views
Last Modified: 2012-05-07
I recently installed (4) cisco 2960 switches at a remote site sitting behind a checkpoint firewall...I am able to telnet to my 3  LAN switches, but am unable to telnet to the core switch below?  I get connection failed.  Traffic is passing through all of the network.  Do you see any issue with the below config that would not allow telnet?

Current configuration : 2759 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname RootSwitch
!
enable secret
enable password
!
no aaa new-model
system mtu routing 1500
ip subnet-zero
!
!
!
!
no file verify auto
!
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree vlan 1 priority 24576
!
vlan internal allocation policy ascending
!
interface GigabitEthernet0/1
 switchport access vlan 2
!
interface GigabitEthernet0/2
 switchport access vlan 2
!
interface GigabitEthernet0/3
 switchport access vlan 2
!
interface GigabitEthernet0/4
 switchport access vlan 2
!
interface GigabitEthernet0/5
 switchport access vlan 2
!
interface GigabitEthernet0/6
!
interface GigabitEthernet0/7
!
interface GigabitEthernet0/8
!
interface GigabitEthernet0/9
!
interface GigabitEthernet0/10
!
interface GigabitEthernet0/11
 switchport access vlan 3
!
interface GigabitEthernet0/12
 switchport access vlan 3
!
interface GigabitEthernet0/13
 switchport access vlan 4
!
interface GigabitEthernet0/14
 switchport access vlan 4
!
interface GigabitEthernet0/15
 switchport access vlan 5
!
interface GigabitEthernet0/16
 switchport access vlan 5
!
interface GigabitEthernet0/17
 switchport access vlan 6
!
interface GigabitEthernet0/18
 switchport access vlan 6
!
interface GigabitEthernet0/19
 switchport access vlan 7
!
interface GigabitEthernet0/20
 switchport access vlan 7
!
interface GigabitEthernet0/21
 switchport access vlan 8
!
interface GigabitEthernet0/22
 switchport access vlan 8
!
interface GigabitEthernet0/23
!
interface GigabitEthernet0/24
!
interface GigabitEthernet0/25
!
interface GigabitEthernet0/26
!
interface GigabitEthernet0/27
!
interface GigabitEthernet0/28
!
interface GigabitEthernet0/29
!
interface GigabitEthernet0/30
!
interface GigabitEthernet0/31
!
interface GigabitEthernet0/32
!
interface GigabitEthernet0/33
!
interface GigabitEthernet0/34
!
interface GigabitEthernet0/35
!
interface GigabitEthernet0/36
!
interface GigabitEthernet0/37
!
interface GigabitEthernet0/38
!
interface GigabitEthernet0/39
!
interface GigabitEthernet0/40
!
interface GigabitEthernet0/41
!
interface GigabitEthernet0/42
!
interface GigabitEthernet0/43
!
interface GigabitEthernet0/44
!
interface GigabitEthernet0/45
!
interface GigabitEthernet0/46
!
interface GigabitEthernet0/47
!
interface GigabitEthernet0/48
!
interface Vlan1
 description Management
 ip address 192.168.110.10 255.255.255.0
 no ip route-cache
!
ip default-gateway 192.168.110.254
ip http server
snmp-server community RootSwitch RO
!
control-plane
!
!
line con 0
line vty 0 4
 password
 login
line vty 5 15
 password
 login
!
end
0
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Question by:bbresslin
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11 Comments
 
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Expert Comment

by:Jan Springer
Comment Utility
How do the other 3 switches connect to this switch?

Can you ping 192.168.110.10?  If so, do you see any interesting information when you do a "show log" on that switch from console?
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Author Comment

by:bbresslin
Comment Utility
I can ping 192.168.110.10 from the other switches....I just can't telnet to it....I can't open console session...its 7 hours away...
0
 
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Expert Comment

by:Don Johnston
Comment Utility
Once again, how are the other 3 switches connected to this switch? Are they all in the same location? What are the IP addresses of the other switches?

I could be a rule on the firewall that is blocking access to this one switch.
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Author Comment

by:bbresslin
Comment Utility
The other 3 switches come off ports on the main switch...direct connect..

192.168.110.10 is the root.....    .11 .12 and .13 are the other 3 switches...
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Expert Comment

by:Don Johnston
Comment Utility
Then if you can't telnet to the .10 switch from outside, but you can telnet to 11, 12 and 13 and you can ping .10, it's the firewall.

You can test this by telnetting to the .11 switch and then try to telnet to the .10 switch. If that works, it's the firewall.

BTW, you DO have a vty password defined, right? Your posted config doesn't show one.
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Author Comment

by:bbresslin
Comment Utility
I do have one defined....I removed it from the config...I telnetted from the firewall to the .11 switch then tried to telnet to the .10..

Password:
switch1>en
Password:
switch1#telnet 192.168.110.10
Trying 192.168.110.10 ...
% Connection refused by remote host
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Expert Comment

by:Don Johnston
Comment Utility
Do you have a vty password defined on the .10 switch?

Do you have a privileged mode password on the .10 switch? Either one of these will prevent you from telnetting to the switch.
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Author Comment

by:bbresslin
Comment Utility
!
hostname RootSwitch
enable secret 5 $1$.f.Z$4RRZBmWLOK8BcIIl0ZW6Z1
enable password 7 110D13001A1F595D06

line vty 0 4
 password 7 104A031C081A405A4F
 login
line vty 5 15
 password 7 104A031C081A405A4F
 login
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Accepted Solution

by:
Don Johnston earned 500 total points
Comment Utility
So you have these defined before?

If so, then there's only three things that would cause this behavior.

1) There's a VLAN Access-List on a switch that the telnet packets are traveling through which are blocking telnet traffic.

2) The switch that you're telnetting from has an ACL outbound for the vty lines.

3) If you've changed any IP addresses recently, it could be that you have another device with a .10 address. The ARP cache has an incorrect (outdated) entry for this .10 address. The result being that your packets are being delivered to the wrong destination.
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Author Comment

by:bbresslin
Comment Utility
I would almost bet it's number 3....I was given these IP addresses to use from a client....from an active subnet on their LAN...I will follow up to see if it is or has been previously used...
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Author Closing Comment

by:bbresslin
Comment Utility
it was number 3....IP address was changed...
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