As an SMB your trying to control
costs and, at the same time, provide constant connectivity to your site.
Fixed frame-relay circuits and static IP addresses are out of your monthly IT expenditures budget
so you go with a DSL or cable provider. The only problem is if you reboot
the router the IP address may change (as it gets its' IP from a
DHCP server). Is there anyway to make sure your customers can always get to your
site? The answer is DDNS or "DynamicDNS"!
This requires TWO
components...first a DNS service provider that support DDNS and a client component
to update your DNS records. One such service is "DNS Made Easy"
that will (for a nominal annual fee) maintain your DNS nameserver records.
Follow the link for detailed
information on this subject as well as how to get started.
(NOTE: Some ISP's do not
allow you to host e-mail or web sites without Business Class FIXED IPs.
You may want to verify your options prior to signing up with a service
provider offering DynamicDNS)
Information regarding Microsoft
Active Directory. Introduced in Win2000 AD provides the ability to
consolidate resource management and security into one place. With AD
you can manage your infrastructure deployment including devices, users
and servers with extremely granular security and control.
Follow this link to get a
guicorporation.com overview on AD and its capabilities. Whether your
an executive with a "30,000ft view" or a technical administrator looking for
additional information we have it here.
Includes several links for up-to-date tools and utilities for simplifying
your AD environment.
Information regarding the most
commonly referenced Cisco IOS commands. Although not intended as a
complete reference it does provide insight on router configuration
and concepts which can be very useful for both those still pursuing their CCNA
as well as those who just need a quick refresher on a particular command and its
A link to Cisco Documentation
on Introduction to Firewalls. A high-level read on internet security
issues and protecting confidential information.
Also includes information relating
to specific types of attacks including:
- Network packet sniffers
- IP spoofing
- Password attacks
- Denial of Service (DOS)
- Application-Layer attacks
All network techs know the general formulas for conversion of decimals to binary
then calculating available number of networks and hosts BUT...wouldn't it be nice to just punch in an IP
address and subnet mask to get the rest of the information you need?
Well now you can
with this great site provided by SemSim who also provide CCNA certification training
Returns network address, all possible subnets, Class and type of
the IP address, number of hosts available and binary representation of the
Note: This tool does not
provide for VLSM (Variable Length Subnet Masks); an issue most SMB's will
never have to address. If you feel you need assistance here please
The DNS Resource Directory.
Everything you ever wanted to know about the Domain Name System and more!
Includes high-level overviews on
what DNS is, what are domains and what kind of information is stored in the DNS.
The site also includes links for
configuration examples, where to get training and additional links for books on
Amazon for DNS platform-specific implementations on:
- Windows NT
- Windows 2000/2003
Get information from dhcp.org
authors Ralph Droms and Ted Lemon on best practices for DHCP
implementation. Links of interest include: