Problem solve
Get help with specific problems with your technologies, process and projects.
Problem solve
Get help with specific problems with your technologies, process and projects.
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MTU and GRE
How GRE can mess you up, and how to use MTU to solve the problem. Continue Reading
Protecting your border routers
This first article in our Weakest Link series tells what should be included in the config file for your Cisco border routers. Continue Reading
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Router Expert: Automating configurations and backups with Expect
This month, Michael Martin looks at automating router configuration changes and configuration backups. Continue Reading
Gateways vs. routers/bridges?
Ethernet packet collision over fiber optic?
Use RELOAD to fix Cisco router errors
Barrie SosinskyContinue Reading
Using Sniffer Pro Dashboard for proactive management
This tip discusses proactive network performance baselining with the Sniffer Pro protocol and network analysis tool.Continue Reading
Configuring a Windows VPN and WWW/FTP server
Problems you might encounter and how to get around them.Continue Reading
Traffic policing and shaping
Once you understand traffic flows and queuing, you can move on to managing quality of service with more advanced practices.Continue Reading
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CCNA expiration date?
Explaining concurrent tunnels
Network Design and Case Studies
This book excerpt provides an introduction to designing campus networks, WANs, and remote connections.Continue Reading
Top-Down Network Design
Learn about the first step of network design: analyzing your customer or company's business goals.Continue Reading
MOM: Network management, Microsoft style
Looking to proactively monitor your network but aren't ready for a full-blown NMS? Try Microsoft Operations Manager 2000.Continue Reading
Router Expert: Using Cisco IOS logging, part 2
Our router expert configures a syslog server to accept IOS logging messages and report on potential vulnerability scans.Continue Reading
Alternative encryption algorithms
Advantages and disadvantages of algorithms other than DES.Continue Reading
Multiplexing in OSI model?
Propagating static routes
How to go about it, with code snippetsHow to go about it, with code snippets.Continue Reading
ATM vs. leased line?
LAN design process?
Layer 2 switch saturation?
Voice over frame relay vs VoIP?
Router Expert: Using Cisco IOS logging, part 1
This tip examines system message logging, Unix syslog, and Cisco's IOS logging implementation and configuration.Continue Reading
VPN termination
Where should you terminate your VPN?Continue Reading
Protocols vs. network layers?
Firewall security risks
Blocking certain MAC addresses
Network management: Why we need it
Find out about the major fundamentals and players in the field of network management systems.Continue Reading
Router Expert: Building a secure TACACS+ environment
This article details the creation of a Linux-based system auditing and accounting server for Cisco TACACS networks.Continue Reading
Personalizing your enterprise: a one-to-one approach to customer interaction
Personalization technologies can help enterprises cultivate customer loyalty.Continue Reading
Phone numbers and IP addresses
Which came first: TCP/IP or OSI?
Securing the FTP service on HP-UX: Intro to the ftpaccess file
Today, HP-UX supports additional security methods.Continue Reading
Can two VPN clients coexist?
Advantages of 1800MHz GSM
Know your split-tunnel "gotchas"
The good and the bad of turning on split tunnels for your VPN.Continue Reading
Disabling open ports a good idea?
Workgroup vs. domain
Using H.323 with NAT
VPN RRI with HSRP
Improve efficiency and resiliency in your VPN.Continue Reading
Setting up an Internet cafe
RSVP problems
Don't rely on Reservation protocol (RSVP) to handle connection admission control. It can't all the time.Continue Reading
MCSE vs. CCNP
Advantages of DHCP and NAT
Why is ARP necessary?
NetBIOS name resolution problems
Output Netstat to text file
In an addendum to a previous tip, one of our users points out the ability to send Netstat output to a file.Continue Reading
Windows 2000 port forwarding
This tip discusses how you can put servers inside your firewall and still access them from the Internet in Windows 2000.Continue Reading
Mobile computing vs. wireless
Max distance for multimode fiber
Fiber vs. T1/T3 connections
Cisco switch code questions
The VoDSL and VoIP difference
Managing network traffic during backups
If you can't perform backups after hours, one solution might be to do incremental backups.Continue Reading
The purpose of honeypots
Honeypots are primarily deployed to distract would-be attackers from the real servers. Using a honeypot may give you the opportunity to detect and respond to an attack (on the bogus system) before the attackers are able to do any real harm.Continue Reading
Blocking NT NetBios name queries
Using private IP addresses to evade detection
This tip has got an IP security trick.Continue Reading
Accessing the Windows partition from Linux
Try this easy way for an administrator working in a Linux partition of a system to access another partition running Windows.Continue Reading
Disabling UDP checksums
Tom Lancaster takes a look at an often overlooked way to soup up your network.Continue Reading
Wireless LAN requirements
Thinking of going wireless? Find out what you need to consider in planning for a wireless network.Continue Reading
Internet standards bodies
How many is too many collisions?
Protecting the LAN from lightning strikes
Successful telework hinges on infrastructure
Telework is gaining ground as companies offer their employees more flexible working environments. To have a productive telework program, IT managers must be aware of the challenges and provide the necessary changes in infrastructure and support.Continue Reading
Using the router to find TCP/UDP ports
Here's a quick tip to help you figure out which TCP/UDP ports are being used by an application.Continue Reading
The V35 interface and its alternatives
A Bluetooth network topology with class
IP source routing and security issues
Selecting a routing protocol
How do you pick the protocols you want to use for routing? This tip discusses selection criteria.Continue Reading
Use MRTG to monitor your managed network
The Multi-Router Traffic Grapher can help you to monitor your entire managed network.Continue Reading
Checking the interface with netstat
Troubleshooting with the arp command
How can you find out if where your network problems originate? One way is to use the ARP command.Continue Reading
Advantages of dynamic routing
Learn how dynamic routing cab help you achieve better scalability and adaptability.Continue Reading
Troubleshooting with the ifconfig command
Sometimes you just can't connect, and nothing you do seems to work. How can you find out what's wrong? Check out this tip.Continue Reading
Advantages of static routing
This tip explains why you might want to choose static routing over dynamic routing.Continue Reading
Benefits and costs of multi-protocol routing
The networking world is inevitably converging on Internet Protocol, but there are some other protocols to consider.Continue Reading
The ping command
Redundant links
What is Softswitch?
Scavenging stale records
Optimizing network administration processes
Performing intrusion analysis
This tip discusses how you would go about analyzing intrusion-detector reports.Continue Reading
Understanding a tribal flood attack
The importance of the subnet mask
AC or DC?
Using ifconfig to change interface configuration