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Cisco 2600, Fractional T1 and DHCP

Hi all.

I would like to know if it's possible to use a fractional T1 512kb with 20 users?
Would I be able to configure the Cisco router to run DHCP?
Using a Cisco 2600

Since we can't afford to have a real network all my users need is access to the internet.

Would anybody be able to point me to an example configuration?

I am sure the router can also be a low grade firewall as well?
I am assuming with the latest IOS

Les Moore

Sure it can.
Assuming that you have enough memory in it to run the "PLUS" feature set, and that you have an integrated WIC T1 DSU module.

Pretty basic config:

!
Interface serial 0/0
no shutdown
description Link to Internet Circuit ID ZZ989L43C <-- descriptive text
ip address 12.34.56.7 255.255.255.252 <-- provided by ISP
encap frame-relay | ppp <-- ISP tells you which
ip nat outside <-- firewall at most basic level - network address translation
!
Interface Ethernet 0/0
no shutdown
ip address 192.168.222.1 255.255.255.0 <-- use private IP addresses
ip nat inside <-- inside private ip addresses are translated to the one public IP
!
ip nat inside source list 1 interface serial0/0 overload
!
access-list 1 permit 192.168.222.0 0.0.0.255
!
! setup the DHCP server piece
! ip dhcp pool {name}
ip dhcp pool dhcppool1
network 192.168.222.0 255.255.255.0
domain name mydomain.biz
dns-server 192.168.222.22 198.6.1.2 <-- local dns server and failsafe public dns server
netbios-name-server 192.168.222.22 <-- local WINS server (if you have one)
default-router 192.168.222.1
!
end

Badabing..... that's about all there is to a basic config.
There are several things you'll want to add to "lock it down" a little more. Best place to start is to look at the securing Cisco edge router guides at http://www.nsa.gov/snac/index.html

ShinCat

ASKER

Funky fresh!

You win the prize!

How much memory would you say for 20 people?

32MB do the trick?

Or like anything else the more memory the merry? :)

hmm the DNS server may be tricky. Since we don't have a real network, just users with machines.
maybe a Linux DNS server would work?

ASKER CERTIFIED SOLUTION

Les Moore

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