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 a direction (input or output). When you configure a VACL and apply it to a [...]
After connecting a switch to your network, it will be useful if the network administrator can login remotely into it to do troubleshooting, check logging and so on.
The easiest way to manage your switch remotely over the network is to configure an IP address for the default VLAN.
interface Vlan1
ip address 10.2.6.85 255.255.255.0
ip default-gateway 10.1.1.1
Basically there are 2 ways in resolving hostname to IP address:
1. DNS
2. Host file
The easiest way is to register a hostname in a DNS server. All computers in the network point the DNS server setting to this DNS server.
In this case, you only need to modify this information in the DNS server and the [...]
The default VLAN on all switches is VLAN 1.
By default, all ports in a Cisco switch belong to VLAN 1. With all ports in the same VLAN (in this case VLAN 1), all ports can communicate with each other without going through a router.
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.
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.
This command should be used as a simple cipher to prevent unauthorized users from viewing the passwords [...]
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 when you install Windows 2003 server, by default it is a workgroup computer. Workgroup environment is [...]
Here is a simple howto on adding windows 2003 computer to a Windows Server 2003 domain. This should be valid for other version of windows client computers too.
Before performing the following steps, make sure that your computer can reach the domain controller through the network. You may use ping to test if your computer can [...]
This is a quick fix to vmware network virtualization.
Sometime while using vmware, your guest virtual machine may face the problem with network connectivity. I have this problem with two of my virtual machines the other day. Only one of the virtual machines is able to connect to the network. (By the way, both are created [...]
CamStudio is a software which I use to record all screen activity on my computer for use in software demonstrations and presentations.
Before discovering this freeware, I use Jing most of the time in recording video of what I do. However, one disadvantage with Jing is it only generate Streaming Flash video (SWF) file. As [...]