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New Member

Guest network setup using ASA 5520

Looking into setting up a guest network. We would like to give a certain amount of our internet bandwidth to the guest network and setup DHCP on the ASA for the quest network. The guest network needs to be totally segmented from our corporate network.

24 REPLIES

Re: Guest network setup using ASA 5520

Do you have a proxy server on your network?

You could create a separate zone/interface for the GUEST users giving it a lower security level as the inside. For DHCP have a look at:

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00806c1cd5.shtml

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

We have a microsoft ISA server as our proxy server.

Re: Guest network setup using ASA 5520

"We would like to give a certain amount of our internet bandwidth to the guest network"

I don't think the ASA supports this inherently. There are third party plug-ins for this tough.

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

So you can't throttle a port on the ASA?

Re: Guest network setup using ASA 5520

New Member

Re: Guest network setup using ASA 5520

So the configuration would be like to plug in from a switch port to the ASA port and set up DHCP for the ASA interface on the ASA and use QOS to port throttle the interface?

Re: Guest network setup using ASA 5520

Yup, you could throttle based on the DHCP pool you assign.

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

So the configuration I described looks accurate? Come out of the switch port that is assigned to the guest network vlan into the interface/port on the ASA that will be for the guest network. The ASA interface/port ip address will be the default-gateway for the clients correct?

Re: Guest network setup using ASA 5520

Yes the ASA will be the default gateway.

New Member

Re: Guest network setup using ASA 5520

Looks like a easy configuration then?

Re: Guest network setup using ASA 5520

Seems simple, but then that is a 'relative' thing :)

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

Right...;-)

Thanks

New Member

Re: Guest network setup using ASA 5520

Would we need to configure a vlan on the ASA also to coin side with the vlan on the LAN?

Re: Guest network setup using ASA 5520

You don't need to configure any vlans/sub-interfaces unless you require more zones than the interfaces built-in to your box (5).

You just choose any unused interface and set it up like this:

interface gig 0/2

no shut

nameif GUESTS

security-l 50

ip address

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

For the host to set the interface address as their default-gateway would I need to use "dhcpd option 3 ip 192.168.100.1 interface GUESTS" assuming 192.168.100.1 is the ip address for interface g0/2? And for the host to route out my outside interface (to get to the internet) would I need to set a route?

Re: Guest network setup using ASA 5520

I would assume that is required (setting the default gateway) for a properly designed network.

For the internet you just need a default route on the box:

route outside 0 0

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

From what I have looked through the DNS and WINS for this type of setup are global so the guest network users would be using the same DNS and WINS server as the clients on the corporate network. Are you familiar with this?

Re: Guest network setup using ASA 5520

You can even skip DNS for the guest users. All they do is access the proxy server and the proxy server will resolve DNS for them.

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

So they will proxy off my corporate internal proxy server? Wouldn't you have to touch the vendor PC's to add the proxy info?

Re: Guest network setup using ASA 5520

Can't you ask users to put the proxy?

Anyway this was just a suggestion. You can also give them DNS access.

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

What if I didn't want users on the guest network touching any servers on my nerwork. Could I point them to an external public DNS server? Do you suppose this would work?

Would this point the users on the guest network to the following DNS servers?

dhcpd dns 4.2.2.1 4.2.2.2 interface vendor

Re: Guest network setup using ASA 5520

Yes the public ISP dns is definitely an option. There should be no issues at all.

Regards

Farrukh

New Member

Re: Guest network setup using ASA 5520

As far as nating goes I will need to set that up right? The guest users network will probably nat off the same interface that my corporate network is (the outside) interface. Right?

New Member

Re: Guest network setup using ASA 5520

So you can't throttle a port on the ASA?

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