09-19-2007 06:24 AM - edited 03-05-2019 06:34 PM
I have the following dilema. I have two private networks with the same subnet e.g. 192.168.0.X.
In each LAN I have several devices with IP addresses 192.168.0.1, 192.168.0.2, 192.168.0.3 and so forth. Currently there is no connection between both LANs.
I need to address devices from both LANs from one station, but changing their IP addresses is not an option.
I need to know what type of equipment do we need to make this happen, if it is a router, a bridge or something else.
Any help would be deeply appreciated.
09-19-2007 06:34 AM
HI,
If my understanding is not wrong on your Question.
You wanted to make the 2 different identical VLANS to communicate each other.
You need a L3 Capability Equipment to Route the Traffic between the different VLANS in different Subnets.
Since inside LAN, you can go for a L3 Featured CISCO Switch else if the LANS are located in different Branch Office better go for a CISCO Router.
PLS RATE if HELPS
Best Regards,
Guru Prasad R
09-19-2007 06:43 AM
You will need routers - two of them. You will need to use NAT to translate the addresses so they look different - make net1 look like 192.168.1.0/24 and net2 look like 192.168.2.0/24 for example, so that within the network they use their local addresses, but outside communication makes them look like something else.
09-19-2007 07:10 AM
Hi,
You need a router doing NAT.
The simple reason is: for your host connecting to f.e. 192.168.0.1 in LAN1 and 192.168.0.1 in LAN2 both stations must have unique IP addresses. So the NAT requirement is: 192.168.0.0/24 in LAN1 may be unchanged, but 192.168.0.0/24 in LAN2 has to be translated in a free/unused IP subnet.
There are some documents describing the configuration details, like in "Translating Overlapping Address: Example"
You will find more documents searching for "overlapping address nat" in Cisco search.
Hope this helps! Please rate all posts.
Regards, Martin
09-19-2007 02:30 PM
Martin,
Thank you for the prompt reply. I'll follow your sugestion and hopefully solve my problem.
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