#CISCO IOS CHECKER SOFTWARE#
#CISCO IOS CHECKER SERIES#
#CISCO IOS CHECKER MAC#

A screen shot of the messages can be seen below:Дetails on the DHCP Offer message sent by the Cisco router can be seen below. Router(config-dhcp)#default-router 172.16.1.1Д«ased on the above configuration let's see the messages exchanged as captured from Ethereal application.A Cisco router is configured to provide DHCP functionality as follows: Now let's use the above commands in a real scenario. Finally the server responds with a DHCP Ack unicast message confirming that the IP address has been leased to the clientД«elow is a list of the most important commands to enable a Cisco router to emulate a DHCP server:.The client responds with a DHCP Request message which is a formal request for the IP address offered by the server - this is again a broadcast message.The DHCP server responds with a DHCP Offer unicast message - this message includes the IP address offered to the client, default gateway address and lease time for the IP address offered it may also include DNS servers, TFTP server, and other information.The client sends a DHCP Discover message to locate a DHCP server - this is a broadcast message.The above diagram presents the DHCP message sequence. The messages exchanged between client and server can be seen in the diagram below: Let's start by investigating the process of IP address assignment when a DHCP client requests an IP address from a DHCP server. In this article I will investigate the operation of Cisco routers under all of the above roles. a DHCP relay agent - when it captures IP requests from clients, adds extra information to the request for user identification purposes, and forwards the request to the DHCP serverД¬isco IOS devices can be configured to act as all of the above and even in combinations of two or three of roles.a DHCP client - when it requests an IP address.

a DHCP server - by providing IP addresses when requested to do so.

The difference between them is that while BootP provides an IP address to a client according to the client's hardware address on the BootP server table, DHCP by default provides an IP address automatically to the client from a pool of IP addresses.Д«esides an IP address, the DHCP server can provide the client a lot of information, such as DNS server IP address, Default gateway IP address, Domain name and much more.ДЄ Cisco IOS device can be configured to act as: Both protocols have been created to provide IP addresses to clients when needed.

#CISCO IOS CHECKER SOFTWARE#

Configuration register is 0xF вЂ“ the configuration register setting that defines which IOS software and configuration file to load.The Dynamic Host Configuration Protocol (DHCP) is considered to be an evolution of the Bootstrap Protocol (BootP).ДHCP is literally build upon BootP, and BootP remains an internal part of DHCP.

24 FastEthernet interfaces, 2 Gigabit Ethernet interfaces вЂ“ physical interfaces on the device.

cisco WS-C2960-24TT-L (PowerPC405) processor вЂ“ CPU type.

System image file is вЂњflash:вЂќ вЂ“ the image file of the running IOS.

whether the device was reloaded using the reload command, powered off and onвЂ¦)

System returned to ROM by power-on вЂ“ the reason for the last reload of the device (e.g.Switch uptime is 39 minutes вЂ“ the uptime of the device.Version 15.0(2)SE4 вЂ“ the IOS version that the device is running.Here is a brief description of the most important information: * 1 26 WS-C2960-24TT-L 15.0(2)SE4 C2960-LANBASEK9-MДЄs you can see from the output above, this command gives us detailed information about the IOS device. Motherboard assembly number : 73-10390-03

#CISCO IOS CHECKER MAC#

The password-recovery mechanism is enabled.Д¦4K bytes of flash-simulated non-volatile configuration memory.Д«ase ethernet MAC Address : 00:17:59:A7:51:80 This product contains cryptographic features and is subject to UnitedД¬isco WS-C2960-24TT-L (PowerPC405) processor (revision B0) with 65536K bytes of memory. ROM: Bootstrap program is C2960 boot loaderД«OOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)FX, RELEASE SOFTWARE (fc4)

#CISCO IOS CHECKER SERIES#

Here is an example output of this command executed on aВ Cisco Catalyst 2960 series switch: SW1#show versionД¬isco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 15.0(2)SE4, RELEASE SOFTWARE (fc1)Д¬opyright (c) 1986-2013 by Cisco Systems, Inc.

amount of memory available on the device.

The exec mode show version command displays information about the device, such as:

Cisco ios checker