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Category Archives: Security
The Fewer Services Your System Runs, The Better
It is only a matter of time before an unsecured system becomes contaminated and losing valuable data. In addition, poorly secured system that is compromised can be used for a number of illegal activities. It was reported that several major … Continue reading
Disable unnecessary network services for security
Whether it is a Windows PC, router, switches, Linux machine or network enable device, it is recommended to stop unnecessary services that are run by default. Every running, but unused, service on your system is an unnecessary security vulnerability. Users … Continue reading
Posted in Networking, Security
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Study of ARP using Wireshark
Wireshark is a very useful tool for the study of network protocol! In my previous post on ARP, we have learned some basic about the ARP protocol. Let’s look more detail into the ARP request packet in this post. When … Continue reading
How to setup access list for a Cisco VLAN
We can use VLAN ACL (also called VLAN map) to provide packet filtering for all types of traffic that are bridged within a VLAN or routed into or out of the VLAN. Unlike Router ACL, VACL is not defined by … Continue reading
Posted in Networking, Security
Tagged ACL, Cisco, Cisco Access list, packet filtering, router, traffic filtering, VLAN
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How to limit access from network host to a Cisco device
Sometime you may like to limit only certain IP address to access your Cisco router / switch by using telnet. You may implement it by configuring the access list and apply it to the line vty 0 4 line.
Posted in Networking, Security
Tagged Cisco, Cisco Access list, IP, IP address, network, router, switch, telnet
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How to encrypt Cisco Password
One of the way to secure a Cisco router / switch is to encrypt password in it. In order to encrypt passwords that are saved in the Cisco devices configuration file, you may use the “service password-encryption” global configuration command. … Continue reading
Workgroup vs. Domain in Windows 2003 environment
There are two modes of operation in Windows 2003 environment. Basically a computer can work as workgroup computer or domain computer. Most home and small business environments will be Workgroup, and most enterprise businesses will run in domain mode. Basically … Continue reading
Posted in Networking, PC, Security
Tagged computer, domain, network, Password, server, windows, windows2003, workgroup
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Do not enable unnecessary services on your PC or server
Whether it is a Windows PC, Cisco router, switches, Linux machine or network enable device, it is recommended to stop unnecessary services that are run by default. Every running, but unused, service on your system maybe a possible means of … Continue reading
Posted in Networking, PC, Security
Tagged Cisco, firewall, network service, port, security risk
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How to test if a port is open on a server or PC – Part II
In my previous post on testing of open port in a server, we have learned that telnet command can be used in confirming if a port is open in a server. However, even though a port is already opens in … Continue reading