Network

Howto upgrade IOS on a 3750 switch stack

Network 4 Responses »

Jun 182008

If you want to upgrade IOS on a 3750 switch stack follow this procedure

There are some new IOS commands to automate upgrading of a stack, but I use the familiar manual method.

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Ddclient – Update IP addresses at dynamic DNS service

Network 3 Responses »

May 282008

If you are using zoneedit.com or dyndns.org for your DNS service so that you can access your server using a URL, then you might have to update your DNS record at the service periodically whenever the IP address of your computer changes.Now here is simple solution for this ddclient.

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Upgrade Cisco IOS in a Router or a Switch

Network 9 Responses »

Feb 092008

upgrading IOS on Cisco routers and switches is hightly recommendable because of the following reasons

Patch critical vulnerabilities: Just like any other network device or application, Cisco routers and switches are also prone to security holes. And because routers and switches are critical to network infrastructure, you should plug these security holes as soon as possible.

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Setting Port Security on a Cisco Catalyst Switch

Network No Responses »

Jan 292008

If you want to ensure that only a certain device—for example, a server—is plugged into a particular switch port, you can configure the MAC address of the server as a static entry associated with the switch port.

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Access Network When Everything Else is Blocked Using ptunnel

Network, Security 4 Responses »

Jan 162008

Ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies. At first glance, this might seem like a rather useless thing to do, but it can actually come in handy in some cases. The following example illustrates the main motivation in creating ptunnel:

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Howto Setup Cisco Router Auxiliary,Console and Telnet Passwords

Network 19 Responses »

Dec 182007

There are five passwords used to secure your Cisco routers: console, auxiliary, telnet (VTY),enable password, and enable secret. Just as you learned earlier in the chapter, the first two passwords are used to set your enable password that’s used to secure privileged mode. This will prompt a user for a password when the enable command is used. The other three are used to configure a password when user mode is accessed either through the console port, through the auxiliary port, or via Telnet.

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