Skip to main content

Configuring DHCP Server

Image
By User

What is DHCP?

The DHCP (Dynamic Host Configuration Protocol) is an Internet protocol responsible for automating the configuration of computers which use TCP/IP. DHCP can be used to assign IP addresses to computers by delivering TCP/IP configuration addresses such as IP address, subnet masks, default routers and DNS addresses. It can also be used to provide information for a number of other services such as printers, time, news and TFTP servers.

Config

A Cisco router can be configured as a DHCP server to assign IP addresses. The range of IP addresses which can be given out is called a 'pool'. From this pool clients are leased addresses for a given time, after which the lease expires and the client needs to request a new IP address lease.
The following config lines show how to setup a DHCP pool of addresses in the 192.168.0.0 IP range:

no ip dhcp conflict logging
ip dhcp excluded-address 192.168.0.1 192.168.0.50
!
ip dhcp pool 1 
  network 192.168.0.0 255.255.255.0
  default-router 192.168.0.100
  domain-name jlsnet.co.uk
  dns-server 192.168.0.1 19 194.168.8.100
  next-server 192.168.0.1

The config above also shows how to set the Default Gateway and DNS Servers which are assigned to clients.
The Ethernet address of the switch is "00:07:eb:94:73:c0" and I wanted to assign a manual IP address 192.168.0.100 to it. So I declared:

ip dhcp pool switch
  host 192.168.0.99
  hardware-address 0007.eb94.73c0
  client-name switch
  default-router 192.168.0.100
  dns-server 192.168.0.1 194.168.8.100 194.168.4.100
  next-server 192.168.0.1

Afterwards, as I did a "show ip dhcp binding" on the router, I get the following results:
 
router1#sh ip dhcp binding

IP address       Client-ID/              Lease expiration        Type
                 Hardware address
192.168.0.51     0100.02b3.91f7.34       Apr 05 2003 06:14 AM    Automatic
192.168.0.53     0100.0423.468b.31       Apr 05 2003 08:42 AM    Automatic
192.168.0.69     0100.0423.4682.ab       Apr 05 2003 07:15 AM    Automatic
192.168.0.99     0007.eb94.73c0          Infinite                Manual
Labels:

Comments

Post a Comment

Popular posts from this blog

[韓日関係] 首相含む大幅な内閣改造の可能性…早ければ来月１０日ごろ＝韓国

By Unknown
Post a Comment
Read more

div not scrolling properly with slimScroll plugin

By User
I am using the slimScroll plugin for jQuery by Piotr Rochala Which is a great plugin for nice scrollbars on most browsers but I am stuck because I am using it for a chat box and whenever the user appends new text to the boxit does scroll using the .scrollTop() method however the plugin's scrollbar doesnt scroll with it and when the user wants to look though the chat history it will start scrolling from near the top. I have made a quick demo of my situation http://jsfiddle.net/DY9CT/2/ Does anyone know how to solve this problem?
1 comment
Read more

Why does this javascript based printing cause Safari to refresh the page?

By User
The page I am working on has a javascript function executed to print parts of the page. For some reason, printing in Safari, causes the window to somehow update. I say somehow, because it does not really refresh as in reload the page, but rather it starts the "rendering" of the page from start, i.e. scroll to top, flash animations start from 0, and so forth. The effect is reproduced by this fiddle: http://jsfiddle.net/fYmnB/ Clicking the print button and finishing or cancelling a print in Safari causes the screen to "go white" for a sec, which in my real website manifests itself as something "like" a reload. While running print button with, let's say, Firefox, just opens and closes the print dialogue without affecting the fiddle page in any way. Is there something with my way of calling the browsers print method that causes this, or how can it be explained - and preferably, avoided? P.S.: On my real site the same occurs with Chrome. In the ex
5 comments
Read more