Question

Configure ASA 5500 and two ISP (DSL)

Asked by: ojgarciah

Hello you guy
I hope you can help me with this issue. I have a new cisco ASA 5505 and I have to ISP, both DSL. my issue is that I need to separate two inside networks to go out through different ISP (thats for bandwith purposes).
I get stuck when i configure two NAT, one for each inside and each outside.
I did this:

global (outside) 1 interface
global (outside2) 2 interface
nat (inside) 1 172.16.1.0 255.255.255.0 dns
nat (inside2) 2 172.16.2.0 255.255.255.0 dns

But only the outside works, the outside2 doesn't. Perhaps I am doing something wrong, but what i need is to be able to allow a network to go through one link, and the other through the second link.

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Asked On
2009-03-17 at 17:45:27ID24240081
Tags

Cisco ASA 5505

Topics

Miscellaneous Networking

,

Cisco PIX Firewall

Participating Experts
3
Points
500
Comments
12

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Answers

 

by: philtpaikPosted on 2009-03-17 at 18:10:21ID: 23914840

Not sure if that is possible with the ASA. I believe two outside interfaces are for failover only.

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00806e880b.shtml

 

by: asavenerPosted on 2009-03-17 at 18:24:27ID: 23914901

You need a route out the Ouside2 interface.  

 

by: ojgarciahPosted on 2009-03-17 at 18:59:33ID: 23915033

Hi
Thanks for the answers, I can configure it for failover or backup, but that is not what i need.

What i really need is a dsl link for internet use and the second for VPN an terminal server connections, i don't want to share the bandwidth using the links.

regards,

 

by: chouckhamPosted on 2009-03-18 at 03:38:21ID: 23917075

Hello,

Assuming ISP 1 is for VPN and ISP 2 is for internet traffic:

hostname(config)# route outside <remote LAN IP network address> <remote LAN Subnet Mask> <dafult gateway of ISP 1>
hostname(config)# route outside2 0.0.0.0 0.0.0.0 <default gateway of ISP 2>

Thanks,
Craig

 

by: chouckhamPosted on 2009-03-18 at 03:40:40ID: 23917089

If i have understood your question wrong and the requirement is for inbound traffic, let me know.

Thanks,
Craig

 

by: asavenerPosted on 2009-03-18 at 05:43:13ID: 23917947

You could do this on a router with policy-based routing, but the ASA does not support it.

 

by: ojgarciahPosted on 2009-03-18 at 05:49:33ID: 23918021

Hi chouckham:

That was the first I thought. My issue comes when I have 2 DSLs and I get the IP address by DHCP. I cannot have the link gateways.

One possible answer is to set a router between the ASA and one DSL, configure a route an set a static route since PBR is not supported.

I wish i had another router, but i don´t.

 

 

by: chouckhamPosted on 2009-03-18 at 06:03:58ID: 23918171

what about doing a trace route to find out the gateway ip? even if it is DHCP it should generally show the same gateway address each time...

 

by: ojgarciahPosted on 2009-03-18 at 06:35:04ID: 23918458

Hi,
That would be a possible solution, but if the IP change after a month for example, I would have to reconfigure my ASA, and I don't want it that way.

 

by: ojgarciahPosted on 2009-03-18 at 13:58:27ID: 23923653

Hello chouckham:

Actually i cannot do what you said
hostname(config)# route outside <remote LAN IP network address> <remote LAN Subnet Mask> <dafult gateway of ISP 1>
hostname(config)# route outside2 0.0.0.0 0.0.0.0 <default gateway of ISP 2>
 
Remember i need to reach internet trough different links. if I configure as you say, i can only reach internet using link outside2.

 

by: chouckhamPosted on 2009-03-19 at 14:39:52ID: 23934555

ah, ok i thought you wanted one specifically for VPN traffic and the other for normal Internet traffic - Apologies.

I dont think the ASA5505 model has enough interfaces for what you are planning. you may need the 5510.

 

by: ojgarciahPosted on 2009-03-31 at 12:10:58ID: 24032444

You were right asavener:

That is not possible using an ASA5005. I gave up.
Thanks

20120131-EE-VQP-002

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