Add router between 2 switches or create vlan?

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Tags:
Cabling
Hardware
Hubs
Routers
Switches
Say you have Internet > router (DHCP/NAT) > switch1 > switch2 > computers (switch1 also has computers connected to it) What steps need to be taken to put a router between the 2 switches so the computers on each switch are on their own LAN and invisible to each other? Also, would enabling a VLAN on switch2 be a good alternative to adding a router (assuming that adding a router, for whatever reason, [cost, space, etc.] was not possible)?
ASKED: September 11, 2005  12:49 AM
UPDATED: September 12, 2005  10:32 AM

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Your given info is too generic. It depends on the type of router and type of switches you have. I would use layer 3 switch and VLAN for subnet isolation. Much faster. Routers arer relativally slow even LAN to LAN. How big is your site? How many users? Is expansion capability been thought out?

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  • Bobkberg
    I agree with HatcherBob - and I'll go one step further. You haven't clearly described why (other than invisible) you want to do this - or more to the point, what your overall end objective is. If I had to guess, I'd say that you're trying to have two different LANs sharing a common Internet connection, but with no communication between them. Your best bet would be to use a higher end router/firewall which will accept more than one IP address/network on the inside interface. Or you can buy an older cisco 2500 series, 3Com NetBuilder, HP, Nortel/Bay Network/Other brand which will take the multiple IP interfaces. On the newer side, check out some of the higher end appliances offered by Cisco, NetGear, D-Link, Linksys, Nortel, etc. But since I'm just guessing at what you're trying to accomplish, you'll have to fill in more of the blanks. Bob
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  • Connectme
    Sorry all, first time poster...I'll try and be more clearer next time :) Yes, the goal is to have the computers connected to one switch on one LAN and the other switch on their own LAN and share the same internet connection. This particualar situation applies to an office building...right now a company in one suite can basically browse all shared resources of a company in another suite. I am trying to find out what router they have the T1 line connected to, but I do know that the switches inside are all HP procurve 4000m's. I was hoping that instead of having to upgrade and configure the main router (and add more routers inside), maybe I would just configure the switches so each suite was it's own VLAN, but I'm not sure if this is a better solution security-wise or better to invest in a higher end router. Hopefully this explains the situation better. Please let me know if you need any other information. Thanks for your help.
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  • Bobkberg
    Ok, what I'd suggest then is a couple of cheap Linksys, D-Link, Netgeat, etc. routers between each company's switch and a small switch in front of the T-1. For this class of device, you're talking about $40 each. Then they'll both be protected from each other. Bob
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  • Hittarget
    Dear friend, Connect the router in single switch, connected the two switches thru cross cable. now you provided communication bet two switches, now logged in router settings , in LAN settings give the allaise ip address , now you given two ip address in your router, each ip address are depends your two types of notworks. you can simply access the router from both the network when you gave the router ip as gateway in systems...
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