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Clear Access Control List (ACL) Counters in Cisco IOS

When troubleshooting a problem with Access Control lists, one of the things you would want to do is to clear the counters on the ACL matches.

In Cisco IOS, you can clear the ACL Matches counters as follows:

Clear Counters on All ACLs

ciscorouter# clear access-list counters

This clears the matches on all the ACLs on the cisco router or switch.

Clear Counters on Specific ACLs

Categories: General.

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How to capture text, backup configuration (Cisco,Juniper or anything)with Putty

I dont think we need an introduction to the most widely used Remote console utility, PUTTY. Putty support SSH, Telnet, RLogin & RAW connections.

If you telnet or SSH to your Cisco IOS routers or switches or Juniper Firewalls and ofcourse anything that support CLI and SSH or Telnet then one of the things you would prefer to do is to take a backup of the config (Running or Startup) or even capture session text including logs tech information etc. We discussed here about using Hypereterminal to capture text and hence backup and restore config on Cisco IOS Routers and Switches.

Categories: General.

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Allow user view Running/Startup-Config (red-only) in Cisco IOS

If you want to allow a low-priviledged user on a Cisco router or a Switch to view the Startup Config then this can be done in Routers and Switches running Cisco IOS.

This infact is a simple 2 step procedure as follows:

Set Privileges to view Startup Config

From the Global configuration mode, set the permissions for the privilege level 3. This should allow the users set with privilege level 3 to view the startup config.

Categories: General.

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Enable/Configure DHCP Snooping in Cisco Catalyst Switches (IOS)

DHCP snooping is a DHCP security feature that provides security by filtering untrusted DHCP messages and by building and maintaining a DHCP snooping binding table. An untrusted DHCP message is a message that is received from outside the network or firewall causing denial of service attacks.

Categories: General.

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Configure MD5 encrypted passwords for users on Cisco IOS

The enhanced password security in Cisco IOS introduced in 12.0(18)S allows an admin to configure MD5 encryption for passwords. Prior to this feature the encryption level on Type 7 passwords used a week encryption and can be cracked easily and the clear text password (type 0) as anyone would know is completely insecure. Anyone who can gain access to the privilege mode can view/decrypt these passwords.

Categories: General.

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Import WyseTerm Host List from one user to another in Windows

Back from the holidays only to find my Windows Profile gone missing at work. One of the annoying things was to add all my remote hosts back onto WyseTerm. While the bad news is that there is no single file (which one would expect) that maintains this list, the good news comes in the form of Windows Registry. Yes, the WyseTerm host information is stored in Windows Registry and can be exported from the registry on to a new profile or other users profile.

Categories: General.

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High CPU usage when SNMP is enabled in Cisco Routers

Cisco Routers and Switches with L3 routing functions are seen to have problems with High CPU usage when SNMP is enabled. This can range anything from 15% to 40%. According to Cisco, these are low priority processes and other priority processes requiring CPU cycles are given priority over these processes and this level of CPU utilisation can be is normal. However, it is always better to be safe than sorry and get the CPU utilisation caused by SNMP to bare minimum so as to ensure the Routers function smoothly.

Categories: General.

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How to create VLAN Interfaces for InterVLAN Routing in Cisco IOS

VLAN Interfaces are required in network scenarios where you have different VLANs and need Inter-VLAN switching on Layer3 (Routing capable) switches. Every VLAN that needs to be routed should have a VLAN interface.

Let's say we have VLAN 10 which hosts the subnet 192.168.10.0 subnet, VLAN hosts 192.168.20.0 subnet and VLAN 30 hosts 192.168.30.0 subnet. For Inter-VLAN routing to work, we need to have a VLAN interface setup for each of these VLANs and configured with an IP address from the same subnet which will be the default Gateway for that subnet. Lets say, 192.168.10.254,192.168.20.254.192.168.30.254 are the IP addresses for VLAN Interfaces of VLAn 10,20,30 respectively.

Categories: General.

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Unable to delete Stale/Obsolete statc routes in Cisco IOS


Today, I had to troubleshoot a very peculiar problem on my Cisco Catalyst 3750 switches in two different sites. To cut a long story short, both the sites originally had IPSec VPNs over ADSL internet andtherefore static routes added to pass through their VPN firewalls. However, with a recent WAN migration with leased lines, all traffic moved to the WAN routers.

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FileZilla FTP Client configuration through BlueCoat proxy


If you are attached to a corporate or an enterprise network and connect to internet from behind a BlueCoat proxy which proxies FTP connections then FileZilla FTP client needs needs to be configured accordingly to get it work properly. There is an FTP proxy configuration and a Generic Proxy configuration that can be set in FileZilla client.

Using a Generic Proxy forces it to use Passive Mode connections.However, if you need to use Active mode FTP connections then FTP Proxy should be configured.

Categories: General.

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