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Best way to do two networks behind a single IP?

post #1 of 16
Thread Starter 
I currently have Mediacom cable and I'm using my own Motorola sb6121 and a WRT54gs v1 with DD-WRT mega on it for my home network. My main rig is wired and everything else is on wireless.

Recently I brought home some gear to start working on a "closet lab" to study/train for certs I'd like to get. Now I'm pretty much starting off from scratch with networking. My knowledge is slightly above basic home networking. I run a gaming community and this means my lab server, a Dell PowerEdge 860 running ESXi v5.5, may see some use when our actual game server boxes are down. This isn't a problem but having those public servers on the same network as the rest of my stuff doesn't seem very ideal or safe.

What would be the best way to put my "closet lab" on a separate network from my home network with only one IP from Mediacom *AND* have connectivity to that network from my main rig so I can administrate my ESXi VMs over lan? Some items I have at my disposal...

-A Motorola sb6121
-A WRT54gs v1 running DD-WRT mega
-A WRT54g v6 running DD-WRT micro(would prefer to use this as a WDS/AP for my home network, but not super necessary)
-A Cisco 1711(I have NO idea how to use this, and it's EOL so finding documentation and software for it is pretty hard. I also have no experience with iOS CLI.)
-A WatchGuard Firebox x5 Edge(EOL, but can get documentation)
-A Dell SonicWall TZ-150 wireless(EOL, have documentation, can access config)
-My Dell PE860 server.
-I can also get netgear basic or smart switches through work.

Some ideas I've had so far...

-Put second NIC in main rig, connect closet lab network to second nic, enable ICS on first nic, use main rig as gateway for closet lab network.
-Put switch behind modem, use router for each network. I believe I'm limited here due to only one IP.
-Put smart switch behind modem, set up VLAN for lab network.
Edited by johnny.dot.exe - 10/25/13 at 4:58am
 
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post #2 of 16
I have a setup like this, ideally it's just VLANs. You can use DD-WRT to add routes back into your networks and allow them all to be behind the PAT of the single WAN IP.

The limitation at the moment would be inter-VLAN routing. If you simply used a DD-WRT device it would probably choke pretty hard for transfers between networks. You could probably use one of the servers you have and set up pfsense/monowall/vyatta or similar and have that facilitate routing between VLANs.

If you wanted to major in rig-o-nomics you could lump your internal hosts behind another DD-WRT router and have double NAT. Requests would not be able to originate from your 'DMZ' or first network in this case, but you could originate connections from the inner most network outward and the second router would handle the port translations.
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post #3 of 16
Thread Starter 
The problem with VLAN is my wrt54g v6 is limited by having DD-WRT micro on it, and my wrt54gs v1 is limited by actual hardware(v1.1+ had the better switch chip installed). If I went the VLAN route I'd probably try to order a netgear 108t through work.
 
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post #4 of 16
If you just want basic network isolation, use the Sonicwall.

Interface 0 - LAN - 172.16.0.1/24
Interface 1 - WAN - (to cable modem or whatever)
Interface 2 - LAN - 172.16.1.1/24

Put your WAP behind interface 0 in access point mode, DHCP coming from the Sonicwall.

Put your lab's switch or WAP or both behind interface 2, DHCP coming from the Sonicwall.

They'll be nice and separated, and if you ever want to let the two networks talk to each other, even conditionally, you can do that all on the Sonicwall with great granularity.

Also, if you have one 24 port switch that does VLANs, for instance, you could do the following with VLANs:
Ports 1 - 12 (VLAN 1)
Ports 13 - 24 (VLAN 2)

Go from Sonicwall Int0 -> Port 1, and Int2 -> Port 13.

Simple. Scalable. Manageable. Done.

P.S - I essentially do this at home, but with a newer Sonicwall (I think TZ190). Let me know if you have any questions about how to set it up or if you want to do certain things with isolating the two networks more or making them talk to each other, but right off the bat with that config they should not be able to talk to each other unless you add a route on the Sonicwall.
post #5 of 16
Thread Starter 
Whipped up an OOdraw to see if I got this down correctly. Yellow bolts are home network and grey bolts are lab network.



So I'm basically using the sonicwall as a switch? If so, won't I only get internet on one network since I'm only allowed one IP from my ISP/modem? I'm pretty sure that's why I couldn't just put a switch between my modem and my two networks.

Also the only connectivity I want between networks would be my rig. Integrated NIC = home network/internet, PCIE NIC = lab network for administrating my server VMs over lan. I *think* I could allow my rig connectivity to the lab network through the sonicwall, via port forwarding or something, but I'll attempt to cross that bridge when I get to it.

ETA: My OOdraw shows a switch on the lab network but I do not have a switch yet. I'll just be connecting my server directly to the sonicwall in the above diagram.
Edited by johnny.dot.exe - 10/26/13 at 9:03am
 
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post #6 of 16
Your drawing is pretty much accurate.

The Sonicwall is not just a firewall, but a router. Being a router, it is NAT'ing (NAT = Network Address Translation). While you do probably have only one IP from your ISP, it's the Sonicwall that hands out IP addresses internally, thereby translating all requests from one external IP to many internal IPs, and from many internal IPs to one external IP. This is why you'll always see while at a friend's house or almost anywhere that 192.168.0.x is your device's IP (just for example), because their router is NAT'ing their one external IP into many internals, but that your external IP (viewable at whatismyip.com) is the same no matter which device you are checking from.

The key here is to not DOUBLE NAT. If you have a typical router/wireless access point, like a Linksys home router type thing, you should have an "Internet" or "WAN" port, and probably 4 network ports. When you are setting up that device behind the Sonicwall (say for your home network), you want the network cable from the Sonicwall to go into one of those 4 network ports, not the WAN port. Between that and configuring the AP so that it gets its own IP via DHCP, but has DHCP turned OFF (so it isn't handing out IP addresses, since the Sonicwall is already doing this, and it is getting its IP from the Sonicwall's DHCP scope), the router/AP will act as an ACCESS POINT, not ROUTER.

The alternative is that you are double NAT'ing, which is not good, though it'll technically "work". Basically anything "below" that wireless AP will be on an internal network within an internal network (dream within a dream? two levels deep.. things get unstable). While it can still find its way back out to the internet, devices on that double NAT'd network cannot talk to devices on the first network behind the Sonicwall.

I'm probably explaining poorly, but I think you get the idea. Your drawing is spot on, NAT is just how it all comes together, and that's usually behind the scenes to you.
post #7 of 16
Thread Starter 
With DD-WRT on my router I can forward or disable DHCP so I can try forwarding DHCP requests to the sonicwall and see if that works. That would be ideal because I have a laptop, a desktop, some android devices, and a wifi bluray on wireless and my main rig on wired...and I sure wouldn't enjoy manually configuring all those.

Setting up the router is the easy part. The hard part, at least for me, is configuring stuff on the sonicwall end in order to have the two networks and have them completely separate from each other. The settings I'm seeing in there are a bit beyond what I know.
 
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post #8 of 16
You don't want DHCP forwarding. You just want it to be off. Make sure it's in Access Point mode and you should be good on that front.

For the Sonicwall, what does the UI look like? Is it old and blue looking or like this pic? -- LINK

I can walk you through it pretty easily, but hopefully your Sonicwall firmware looks mostly like what it does in that screenshot. The older firmware sucks.
post #9 of 16
Thread Starter 
Mine looks like this...



...but there are more options on the left nav menu than what you see there. It should be laid out about the same as yours but not as refined-looking.

ETA: The only access point mode I can find is for wireless. Here are my two main drop-down menu choices in the router that I think would be relevant here...

Setup > Basic Setup > WAN Connection Type > Disabled / Static IP / Auto Config DHCP / PPPoE / PPTP / L2TP / HeartBeat Signal

Setup > Advanced Routing > Operating Mode > Gateway / BGP / RIP2 Router / OSPF Router / vtysh OSPF BGP RIP Router / OLSR Router / Router

I figured I would have to set those to Static IP + Router. A friend confirmed Static IP but said to leave the second option set to Gateway. He said set the sonicwall to 192.168.1.1, WAN IP of router to 192.168.1.2, LAN IP of router to 192.168.1.3.
Edited by johnny.dot.exe - 10/26/13 at 8:55am
 
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post #10 of 16
Thread Starter 
Sonicwall is not pulling an IP from my cable modem. I tried refreshing/renewing, rebooting sonicwall, rebooting modem. No dice.

This modem is mine, not Mediacom's, so in situations like this I have to reboot the modem with it connected to the new device(router) in order for it to renew all DHCP leases. Had to do this when I upgraded from my wrt54g v6 to my wrt54gs v1. Just won't work with the sonicwall for some reason. Tried searching around on google and had no luck so far.

ETA: My SW firmware is 3.1.0.15-95s. I managed to find 3.1.1.50 so I'm going to try that and see if it works. The only other option I have is manually configuring those DHCP settings which I don't want to do because any time my modem reboots or I have a power outage I'll have to either call my ISP or use my linksys to fetch that info so I can input it back in to the SW. If auto DHCP won't work between the modem and SW then it's back to the drawing board unless I can find a fix.
Edited by johnny.dot.exe - 10/26/13 at 10:50am
 
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