Tag Archives: cisco 3640 router

OSPF routing between Cisco,Ubuntu,CentOS and Mikrotik Router!

Scenario:

  • Routers: 1 Ubuntu Linux with 3 nics, 1 Centos Linux with 3 nics, 1 Cisco 3640 Router with 3 FastEthernet interfaces and 1 Mikrotik Router with 2 interfaces.
  • Clients: 3 Windows Xp with 1 nic.
IP Details

All the Routers in this scenario have a default password of “zebra“.

Cisco Router:

  • fe0/0: 10.10.10.1/24
  • fe1/0:10.10.50.1 /24
  • fe2/0: Getting through DHCP

UbuntuRouter:

  • eth0: 10.10.10.2/24
  • eth1: 172.16.10.1/24
  • eth2: 10.10.100.1/24

CentOSRouter:

  • eth0: 172.16.10.2/24
  • eth1: 192.168.10.1/24
  • eth2: 10.10.150.1/24

Mikrotik Router:

  • ether1: 192.168.10.2/24
  • ether2: 10.10.200.1/24

Clients:

  • Ubuntu-Desktop: 10.10.50.50/24
  • WinXP-1: 10.10.100.50/24
  • WinXP-2: 10.10.150.50/24
  • WinXP-3: 10.10.200.50/24

Cisco Router Configuration:

UbuntuRouter Configuration:

Restart the Router!!!

CentOSRouter Configuration:

Restart the Router!!!

Mikrotik Router Configuration:

Neighbor verification from Routers:

Route verification from Routers:

Test from Clients:

Make a simple test from Ubuntu-Desktop.

Make a simple test from WinXP-1.

Make a simple test from WinXP-2.

Make a simple test from WinXP-3.

Configure NAT on Cisco Router:

This is just a bonus section, in which we will configure the NAT on Cisco router and also propagate the default route in OSPF. I connect my Cisco Router to DSL Modem and configure it so that it will take IP address through DHCP, as well as configure the inside and outside interface for NAT.

Lazy man access -list for NAT (This is not the perfect access list):

NAT Overload:

Originate the default route in OSPF:

Verify the last resort information on Cisco Router:

Check default route information on all routers 🙂

Hope this will help you!

Please Remember me in your prayers!

Enjoy 🙂

How to Configure Cisco Router with DSL (PTCL)!

In this tutorial, we will configure the cisco(3640) router as a gateway for our LAN. It takes IP setting from DSL (PTCL) Modem through dhcp, in order to access the Internet. This router also act as the DHCP and DNS Server for LAN!

In first step, we will configure fa0/0 interface to take the ip address from DSL Modem:

interface fa0/0
ip address dhcp
no shut

Next, we configure the ip address on fa1/0 interface:

interface fa1/0
ip address 10.10.10.1 255.255.255.0
no shut

Verify the ip address and interface(s) status:

show ip int brief

Now, we will configure this router as dhcp server in order to serve ip address settings to our LAN, we will use the 10.10.10.0/24 network, in which 10.10.10.1 will be the default gateway and dns:

service dhcp
ip dhcp excluded-address 10.10.10.1 10.10.10.20
ip dhcp pool LAN-Pool
 network 10.10.10.0 255.255.255.0
 default-router 10.10.10.1
 dns-server 10.10.10.1
 domain-name home.lan
 import all

Verify that our dhcp server, serves the ip address to LAN:

show ip dhcp binding

Now, we will configure the DNS setting on our router in order to provide DNS services to our network, and make all clients use it as a DNS server:

ip dns server
ip name-server 192.168.1.1
ip domain-lookup

Next step is to configure the NAT on our router, for this, we need to define  the inside and outside interfaces, fa0/0 is connected to the Internet, so it is outside while fa1/0 is connected to the internal network, so it is  inside!

interface FastEthernet0/0
ip nat outside
interface FastEthernet1/0
ip nat inside

Now,we need to create an ACL that will include local network(10.10.10.0/24)!

Next, we need to enable NAT overload and bind it to the outside interface:

Test from one of the LAN’s client:

Verify the NAT status on our cisco router:
show ip nat translations 

Hope this will help you!

Please Remember me in your prayers!

RIP routing between Cisco,Ubuntu and CentOS Router!

Scenario:

  • Routers: 1 Ubuntu Linux with 2 nics, 1 Centos Linux with 2 nics and 1 Cisco 3640 Router with 3 FastEthernet interfaces.
  • Clients: 3 Windows Xp with 1 nic.
IP Details

All the Routers in this scenario have a default password of “zebra.

3640Router:

  • fe0/0: 192.168.10.1/24
  • fe1/0:172.16.10.1 /24
  • fe2/0: 10.10.10.1/24

UbuntuRouter:

  • eth0: 192.168.10.2/24
  • eth1: 10.10.20.1/24

CentOSRouter:

  • eth0: 172.16.10.2/24
  • eth1: 10.10.30.1/24

Clients:

  • WinXP-1: 10.10.20.10/24
  • WinXP-2: 10.10.10.10/24
  • WinXP-3: 10.10.30.10/24
3640Router Configuration:

UbuntuRouter Configuration:

Restart the Router!!!

CentOSRouter Configuration:

Restart the Router!!!

Verification from Routers :-)

Test from Clients :-)

Make a simple test from WinXP-1.

Make a simple test from WinXP-2.

Make a simple test from WinXP-3.

Hope this will help you!

Please Remember me in your prayers!

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