configuring cisco2901

[theboywhocriedwolf]

hello all,

i am about to configure cico 2901 with this set-up (attached file)..

how am i going to start with this? what do i need to know? if example i have the leased ip 125.212.33.x/30 what will i as management for the router? will i used NAT for this?

thanks

[paul driver]

Hello

Will need more details than you have already supplied.

Details from you isp regards public IP addressing ( static or dynamically assigned)

If this ISP supplied router/modem in a  bridge or router mode?

Why type of connection is this - ASDL VDSL etc..

This all will have a bearing on how we can assist you.

res

Paul

Please don't forget to rate any posts that have been helpful.

Thanks.

[theboywhocriedwolf]

hi paul,

is the type of connection really relevant before we can push through the setup? what is ASDL VSDL?? does the isp modem type of connection also has impact for the setup of the router?

as for the leased line here are some details, cite for example i have

wan id: 125.212.x.x/30

isp side: 125.212.x.x

client side: 125.212.x.x

subnet: 255.255.255.252

thanks

[mfurnival]

Well yes it is relevant - we can't advise you on how this should be setup until you provide more detail.

As a guess I would say that your modem presents an ethernet interface to your 2901 and the modem will have a 125.212.x.x/30 address on it. You would then configure your 2901 WAN interface with the other 125.212.x.x/30 address and configure a default route pointing at your modem.

You would then configure NAT to overload on the 2901 WAN interface and configure private addressing on the LAN side.

But all this is guesswork - you might be doing something completely different.

[paul driver]

Hello

Just by going on what you have supplied,

A rough guess of the setup could be something like this.

interface FastEthernet0/0

description Link to ISP Modem

ip address 125.212.12.2 255.255.255.252

ip nat enable

interface FastEthernet0/1

description Link to LAN facing Subnet

ip address 172.16.1.1 255.255.255.0

ip nat enable

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0 125.212.12.1

access-list 1 permit 172.16.1.0 0.0.0.255

ip nat source list 1 interface FastEthernet0/0 overload

res

Paul

Please don't forget to rate any posts that have been helpful.

Thanks.

[theboywhocriedwolf]

hi paul

so you mean to imply that intfa0/0 is for the ISP modem and intfa0/1 is for the client network?

do we need to put default gateway on the router?

thanks

[paul driver]

Hello

The config I posted is ONLY a sample - you will need to choose your own WAN/LAN Facing interfaces.

Also the router doesn't require a default-gateway - it has a default route, However If you attach a switch to your router then the switch will have a default -gateway pointing to the routers LAN interface IP.



res
Paul

Please don't forget to rate any posts that have been helpful.

Thanks.


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[theboywhocriedwolf]

hi sir,

do i need to configure routing protocol on this? or i only need to do NAT?

thanks

[paul driver]

Hello

Usually routing protocol isnt required, - applying a static route would be applicable to the isp lan facing (your wan facing) interface ip

Applying nat all depends on if your isp modem is doing this for you ( routed setup) if not then nat is required

Res
Paul

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[theboywhocriedwolf]

hi paul,

from the diagram above

the modem is from isp so i will not touch anything about the modem. im only concerned in the router portion..

will i put ip route on the router?

[paul driver]

Hello
That sounds good can test connectuon and then post your config
Res
Paul

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[theboywhocriedwolf]

im confuse where will i get my ip for the two interface or my router? (interface for the modem and for the switch going to the user)

[paul driver]

Hello

Use the ip address ( client ip ) supplied by your ISP and assign this to the interface which is going to connect to the ISP modem.
Then add a static route pointing to the ISP modem (wan id)

wan id: 125.212.x.x/30
isp side: 125.212.x.x
client side: 125.212.x.x
subnet: 255.255.255

Look at the example I posted earlier. - if this isn't clear please let us know


Res
Paul



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[theboywhocriedwolf]

hi paul,

thanks.. so i will use the 125.21.x.x for my interface connecting to the modem...

how about the interface connecting to ithe inside network? what ip will i use? is it the gateway of the user?

[theboywhocriedwolf]

hello all,

pls help... the 2900 routers interface status will not up even if i already configure it :

Router1(config)#int gigabitEthernet 0/1
Router1(config-if)#ip add 192.168.20.1 255.255.255.0
Router1(config-if)#no shut
Router1(config-if)#end

Router1#show ip int br
Interface                  IP-Address      OK? Method Status                Protocol
Embedded-Service-Engine0/0 unassigned      YES NVRAM  administratively down down   
GigabitEthernet0/0         125.212.33.34   YES manual down                  down   
GigabitEthernet0/1         192.168.20.1    YES manual down                  down

why is this??

thanks