NAT Traslation in vlan interface

[tdanetsco]

Hello,

I have a cisco router 3845 with Etherswitch modules and one Vlan configured "172.16.6/24", many switch ports are assigned to this vlan. i would like to translate one IP address 172.16.6.200 to a new one "172.25.42.10" but need to keep the other IPs from "172.16.6/24" without changes. below is the configuration of vlan interface and switch port, could someone help.

Best Regards,

Mustapha Bensalah.

interface Vlan100
description L3 Vlan interface for core_vlan
ip address 172.16.6.2 255.255.255.0
no ip redirects
no ip route-cache cef
no ip route-cache
standby 1 ip 172.16.6.1
standby 1 priority 250
standby 1 preempt
standby 1 authentication md5 key-string 7 052A32226E03012D3A2B1F01191C
end

interface FastEthernet4/35
description to RSG
switchport access vlan 100
no cdp enable
spanning-tree portfast
end

[Thotsaphon Lueangwattanaphong]

Hello,

    Where is 172.25.42.10?  Please give us a bit more about your question.

Toshi

[Latchum Naidu]

Hi Mustapha,

If you are sure that the network "172.25.42.10" (172.25.42.0/24) is reachable and have a route then you can do a NAT like below.

ip nat inside source static 172.16.6.200 172.25.42.10 extendable

As said above make sure that the network 172.25.42.0/24 is reachable.

Please rate the helpfull posts.
Regards,
Naidu.

[tdanetsco]

Hi,

i would like to translate the source IP 172.16.6.200 to 172.25.42.10 only when i have to reach some specific IPs otherwise i don't want to translate the source IP, i want to keep it as it is. something like :

if destination IP is X.X.X.X then translate 172.16.6.200 to 172.25.42.10

else "do not make translation"

Best Regards,

Mustapha.

[Latchum Naidu]

Hi Hi Mustapha,

Try like below and see...

ip nat inside source static 172.16.6.200 172.25.42.10 extendable

Please rate the helpfull posts.
Regards,
Naidu.

[Thotsaphon Lueangwattanaphong]

Hello,

       You can try this for testing.

!

access-list 101 permit ip host 172.16.6.200 host x.x.x.x

!

ip nat pool MYPOOL 172.25.42.10 172.25.42.10 mask 255.255.255.0

!

ip nat inside source list 101 pool MYPOOL

!

HTH,

Toshi

[tdanetsco]

Hello,

and what should be configured on ingoing and outgoing interfaces ?

BR,

mustapha.

De : thotsaphon

À : tdanetsco

Envoyé le : Mardi 22 Novembre 2011 9h27

Objet : - Re: NAT Traslation in vlan interface

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Re: NAT Traslation in vlan interface created by thotsaphon in LAN, Switching and Routing - View the full discussion

Hello,

       You can try this for testing.

!

access-list 101 permit ip host 172.16.6.200 host x.x.x.x

!

ip nat pool MYPOOL 172.25.42.10 172.25.42.10 mask 255.255.255.0

!

ip nat inside source list 101 pool MYPOOL

!

HTH,

Toshi

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[Latchum Naidu]

Hi,

and what should be configured on ingoing and outgoing interfaces ?

On the incoming interface configure like below.
interface inside (fa0/1)
ip nat inside

On the outgoing interface configure like below.
interface outside (fa0/0)
ip nat outside

Please rate the helpfull posts.
Regards,
Naidu.

[Thotsaphon Lueangwattanaphong]

Hi,

   Please provide a brief diagram. You need to route 172.25.42.10 back to that router.

Toshi