Solved

Cisco 2600, Fractional T1 and DHCP

Posted on 2003-11-17
3
632 Views
Last Modified: 2010-04-17
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
0
Comment
Question by:ShinCat
  • 2
3 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 9766163
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
0
 

Author Comment

by:ShinCat
ID: 9767798
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?
0
 
LVL 79

Accepted Solution

by:
lrmoore earned 250 total points
ID: 9767890
Anything you can setup as an internal DNS will help...

You'll need the "T" train of IP PLUS IOS
If you go with 12.3, you'll want 64Mb DRAM and 16M flash on your 2600
Cheap DRAM from http://www.crucial.com
As always, more than the required minimum is better
That'll also give you the option to run the Firewall feature set in the future (although for the money, I prefer a 'real' firewall like the PIX)
With this setup, you'll have no problem for 20 - 50 people..
Although I would highly suggest looking at a PIX firewall as soon as budget allows.
The 506e would be my recommendation. For around $1000 you can't go wrong.
Gives you intrusion detection, stateful packet inspection, application layer packet inspection, and VPN capabilities.
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

I have seen some questions on problems with SSH/telnet access to Cisco routers that may occur despite the fact that from a PC connected to your LAN, Internet connectivity is in place and users can access Internet sites without any issues.  There are…
Getting hacked is no longer a matter or "if you get hacked" — the 2016 cyber threat landscape is now titled "when you get hacked." When it happens — will you be proactive, or reactive?
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now