NAT on 2600?

[zekwueme1]

Folks I am brand new at this.

I have a 2600 (with a T1, 1 Fast ethernet,1 serial interface)connecting to the internet port on my RR modem. First, how do configure NAT and DHCP server on the router. Second, how do I connect 2924 switch on it for my network.

[Anand Narayana]

Hi Zek,

find the DHCP & NAT configuration below for ur Cisco 2600 Router.

ip dhcp pool TEST

network 192.168.1.0 255.255.255.0

dns-server

default-router 192.168.1.1

domain-name abc.com

ip dhcp-server 192.168.1.1

interface Serial0

description "Connected to Internet"

ip address x.x.x.x 255.255.255.252

ip nat outside

!

interface FastEthernet0

description "Connected to LAN"

ip address 192.168.1.1 255.255.255.0

ip nat inside

!

ip nat translation timeout 3600

ip nat pool TEST 1.1.1.10 1.1.1.15 netmask 255.255.255.240

ip nat inside source list 1 pool TEST overload

ip classless

ip route 0.0.0.0 0.0.0.0 Serial0

no ip http server

!

access-list 1 permit 192.168.1.0 0.0.0.255

1.1.1.x is the list of public IP address given by ur ISP.

hope this helps.

rate this post.

[spremkumar]

Hi

From your ISP are u getting any public ip block which you can make use for the NAT pool ?

If not then you need to go on for PAT doing overload onto your serial interface which gets you connected to you SP.

regds

[sourabhagarwal]

you have to connect switch to fast ethernet interface of router and T1 terminated on serial interface.

I'm assuming that you are having public IP from ISP which will be configured on T1 interface of your router and you have a private subnet which will be used for internal LAN. I'm taking 192.168.0.0/24 subnet for your LAN.

NAT config on router will look like this:

interface FastEthernet0

description *** Connected to LAN Switch ****

ip address 192.168.0.1 255.255.255.0

ip nat inside

interface Serial0

description *** Connected to ISP Router ****

ip address x.x.x.x x.x.x.x

ip nat outside

ip route 0.0.0.0 0.0.0.0 s0

access-list 7 192.168.0.0 0.0.0.255

ip nat inside source list 7 interface serial 0 overload

check this URL to get more information on NAT.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml

hope to help ... rate if it does ....

[zekwueme1]

Thank you all.

The T1 int. connects to another T1 int. on another 2600b in a WAN serial simulation. 2600a has only one fast ethernet int., which is connecting to RR modem. Configuring NAT/DHCP server is my first objective, the other one is connecting a 2924 switch off the router. Possible?

[sourabhagarwal]

for connecting switch to this router, you should have atleast one free ethernet/ fast ethernet port on this router which I think you don't have, so I don't think it is possible to connect switch to this router.

you can configure NAT/DHCP on this router as mentioned in previous posts, But I'm not sure where you are going to use these services because I guess you will configure NAT/DHCP for the clients which will be connected to your network through switch.

so, your first objective should be to connect a switch to this router and then configure NAT/DHCP on it.

hope to help ... rate if it does ...