modem isp connect to router : how pass-trought port g0/1 to port g0/0

[andohuerta]

hi 

i want to know if is possible to connect a modem isp dhcp to port g0/1 and connect a end user to g0/0 and receive a dhcp directly from isp modem not from cisco router  (not Nat form router cisco)

thank you for your help 

router: cisco 2951

also :ars1k

this is my config :

interface GigabitEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
no ip route-cache
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address dhcp
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto

!

!
ip nat inside source list 50 interface GigabitEthernet0/1 overload
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 dhcp!
!
!
access-list 50 permit 192.168.1.0 0.0.0.255
!

thank you again for your help

[balaji.bandi]

Are you Looking to bridge the interface to get IP address to user directly from ISP Modm ? so what is the use of router, you can use the switch right?

If you like to use Router in between ISP Model and Lan

ISP Modem -------gig0/1--gig0/0---LAN 

change this to outside interface :

ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1 dhcp

what IP address you get from DHCP on the gig 0/0 from DHCP? (make sure that is not conflict with LAN IP address)

can you post below information :

show IP interface brief

are you able to ping me from 

[andohuerta]

my goal is to put the isp modem in port g0/1 and send it to port g0.0.36
but I wanted to test without vlan to see if it works

Router#sh ip interface brief
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 unassigned YES unset administratively down down
GigabitEthernet0/0 192.168.1.1 YES manual up up
GigabitEthernet0/1 192.168.2.150 YES DHCP up up
GigabitEthernet0/2 unassigned YES unset administratively down down
ucse1/0 unassigned YES unset administratively down down
ucse1/1 unassigned YES unset up up
NVI0 192.168.2.150 YES unset up up
Vlan1 unassigned YES unse 

I also use the router for other inputs, I do this because my isp modem which also carries the iptv signal,
it is too complicated to configure the multicast addresses in the cisco router for the tv to work,
and I carry this signal on the fiber to another location

thank you for your help again

[balaji.bandi · Accepted solution]

You need to bridge the interface, i know new platforms works never tried on 2951

check below guide to help you :

https://www.cisco.com/c/en/us/support/docs/lan-switching/integrated-routing-bridging-irb/17054-741-10.html