Multiple gateways on a single router?

February 28, 2011 at 11:26:45
Specs: Windows XP
We are in the process of installing time clocks at some of our sites around the USA. Our security department has asked that the time clocks be completely isolated from the rest of the network. The time clocks will be administered by ADP via a centralized firewall utilizing NAT. We have multiple subnets available at each site. Let me give an example to calrify what I would like to do.

Example: Site A has /24 user subnet and is configured for VLAN1 using on the router as the default gateway. I would like to use subnet /24 for the time clocks, configure it for VLAN2 and use as the router gateway address for VLAN2. This should allow me to NAT one of our additional public IP addresses to the gateway address thus completely isolating the time clocks from the remainder of the network.

Problem is I have not done this before so I'm a little confused about how to configure it in the Cisco 3750 switches. Can any-one give me some guidance ???

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February 28, 2011 at 15:11:19

You do have a dual port Router that has more than one WAN port correct.

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March 1, 2011 at 05:49:50
Yes the router has more than one WAN port.

The most important issue is to keep VLAN2 completely isolated from VLAN1 to satisfy Security concerns. I do not want VLAN1 and VLAN2 to ba able to route to each other.

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March 1, 2011 at 07:11:57
VLAN's are by definition, separate from each other.

If your VLAN's have separate subnets and you do not create static routes between those subnets (VLAN's) then they can't cross communicate.

From the sounds of it, you don't really understand VLAN's and VLAN tagging and I highly recommend you spend a little time doing some reading/research on VLAN's before you begin.

I'm a little confused about how to configure it in the Cisco 3750 switches. Can any-one give me some guidance ???

Again, it's better to know what you're doing before starting out to do something than it is to try and figure it out on the fly. My recommendation for you is to hire a qualified professional to help you get everything setup.

Left to your own devices, and taking into consideration your level of knowledge, you're more likely to make a mess of things than you are to successfully set it up.

I'm not saying this to put you down or disrespect you, I'm simply pointing out a fact and attempting to give you some good advice which should save you time and therefore, money.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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March 1, 2011 at 13:05:43
On that note, remember to backup your running configs before you start.

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March 1, 2011 at 17:49:22
You don't need multiple wan ports. Most business class routes support subinterfaces on the same port.

Most time displays use NTP to set their time. They just need internet access.

Nothing fancy to setup time clocks.

Answers are only as good as the information you provide.
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March 4, 2011 at 04:10:17
thanks for information..

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