Connecting multiple LANs

[PCSComputerGuy]

Hey All,

I have a client who has been running two different LANs in two different building. They would now like to connect the two for communication. One side is a 10.x.x.x subnet and the other runs a 192.x.x.x subnet.

I think I might be over complicating this in my head but do I have to run two separate vlans in one switch and configure intervlan routing? Does that require a layer 3 switch or will a layer 2 work? Is there an easier way to do this?

Thanks in advance!

 

[YeOldeStonecat]

Or...depending on the existing router....(since you'll use "routing" to merge them)...you could pull it off with the router at the edge. If it's a home grade one...likely not. Although I've seen a little Linksys befsr sitting in between two large networks to merge them..LOL. They had it in router mode, not gateway mode (99% of users put residential routers in gateway mode).

Remember...a "router" is used to connect networks.
We typically think of "routers" as Linksys or Netgear routers...like we see in homes or small businesses. Those are routers...running in gateway mode..but they're still connecting two networks...the private network, with "the internet"..which is really just another network. But in gateway mode they're doing NAT. In traditional router mode...they can do more....

 

[PCSComputerGuy]

Cisco ASA 5505 is the firewall/router...

 

[PCSComputerGuy]

So i should be able to do a static route in the ASA to merge traffic on the two networks. I'll probably also have to create a DNS lookup on my server, correct?

Thanks for your help. I had a feeling I was making it more complicated than need be.

 

[PCSComputerGuy]

So if i run:

route inside 192.10.10.0 255.255.255.0 10.0.1.1

Where 192.168.10.0 is the current "non internet" subnet, and 10.0.1.1 is my ASA.

 

[Nerm]

Don't forget you will need a route on the other end to route traffic back. 192.168.10.0/24 has to know how to get to 10.0.1.0/24 and 10.0.1.0/24 has to know how to get to 192.168.10.0/24.

 

[PCSComputerGuy]

Just to clarify, then I will need to run that same command in a reverse order?

Thanks

Signed,
Not a CCNA

 

[Nerm]

Actually if they are both directly connected networks you shouldn't need a route statement for either. If you run a "show route" on the ASA does both networks already show up as "directly connected" in the routing table?

 

[PCSComputerGuy]

Thanks Nerm. I don't actually have them hooked up yet so I will test that to see.

 

[PCSComputerGuy]

Just a follow up because I realized I wasn't completely clear. The two buildings will be connected directly. Not a VPN or anything