1. Firewall InstallationBy
Colton Podvorec

2. To Start Off
A firewalls function is to screen a Networks Communication
Preventing unauthorized access to or from a networked computer

3. What is a Firewall Maybe a single computer or a series of computers
All communication passes through the firewall
The firewall permits only traffic that is authorized by the administrator
The firewall can withstand attacks upon itself

4. How it works Four categories Packet Filters
Application layer gateways(proxy firewalls)
Circuit level gateways
Stateful packet inspection engines
Packet filtering - Packets (small chunks of data) are analyzed against a set of filters.
Packets that make it through the filters are sent to the requesting system and all others
are discarded. l
Proxy service - Information from the Internet is retrieved by the firewall and then sent to
the requesting system and vice versa.
Stateful inspection - A newer method that doesn't examine the contents of each packet
but instead compares certain key parts of the packet to a database of trusted
information. Information traveling from inside the firewall to the outside is monitored for
specific defining characteristics, then incoming information is compared to these
characteristics. If the comparison yields a reasonable match, the information is allowed
through. Otherwise it is discarded

5. Microsoft ISA server 2000 enterprise
Requirements
.5 GHz processor
512 MB RAM
20 GB HHD
2 NIC

6. Start of Install Running a server with Microsoft server 2005/2008
Insert and run the CD
Enter credentials
Select ISA-firewall mode

7. Install Three options Choose Dedicated Template Dedicated template
Limited Service
Secure template
Choose Dedicated Template
Fully customizable
Continue to fully install

8. Creating clients sets
Creating client groups helps organize user groups such as department
Select “create a client set” icon in results pane
Name the group and use a description if the group is not a logical grouping like a department or lab name
Enter machine addresses either individually or in IP ranges

9. Creating Client Sets Protocols
Select the protocols which you intend to have rules on
Such as HTTP, HTTPS, FTP
And also select time frames for rules to be applied
Default is full time unblocked access

10. Site and Content Rules
Enables you to block specific IP addresses which may contain certain content
Purpose of these rules is to specify different rules for web content, depending on a few factors
Source IP address
User
Destination
Content type

11. Setting Site & Content Rules
Select Create a Site and Content Rule option from the Configure Site and Content Rules Option
Create a name which easily identifies what the rule will do
Next window is where you enter the site which is going to be blocked and check the deny option
Optional to put a redirect site
Ex.
This lists the blocked sites and the reasoning behind blocking them

12. Site & Content Rules cont.
Next window then sets who you are blocking from this site, from the Client Group Sets which you established previously
Ex. Accounting dept., or Computer lab A

13. This is a fast and easy way to start the firewall setup
More complex rules should be created in order for the system to work up to its potential