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Routing between 2 subnets using a Cisco ASA 5510

Posted on 2009-05-20
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Last Modified: 2012-05-07
I have just entered into a contract with a small hospital and they have static IP addresses for everything. I am almost out of IPs. No money in budget for router.
I would like to route traffic between 2 subnets. 10.20.20.0 and 10.20.30.0
Currently everything is assigned a 10.20.20.0 address. I want to use 10.20.30.0 255.255.255.0 for the DHCP. I need to move the workstations, using DHCP, to 10.20.30.0.
The AD, DNS, Accounting, File, etc. servers will remain on the 10.20.20.0 subnet.
Can I route using a Cisco ASA 5510? I am a beginner with the ASA 5510.
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Question by:vincejpgn
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by:giltjr
ID: 24435333
Although you can, I would not.  Do you have any other L3 capable devices, a L3 switch that supports VLAN's and routing?

How about an inexpensive/spare PC running Linux?
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by:vincejpgn
ID: 24435377
I can setup a PC running Ubuntu linux. How would I set it up on it?

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giltjr earned 500 total points
ID: 24435436
It depends on the type of switch and how much network traffic you have.

If you can, I would create two VLANs on your switches, say VLAN20 and VLAN30.  VLAN20 will be will be for all devices in the 10.20.20.0/24 subnet and VLAN30 for 10.20.30.0/24.  Then assign switch ports to the approprate VLAN as needed.  This way broadcast traffic from one subnet does not get sent to comptuers/devices in the other subnet.

Then get a PC with two NIC's.  Each NIC will have a single address in the different subnets: NIC 1 in 10.20.20.0/24  and NIC2 in 10.20.30.0/24.  Enable IP forwarding.

Then you will need to alter routing tables someplace and somehow.  What I would suggest is that for the new subnet you setup the Linux box to be the default router, then on whatever the current default router is for 10.20.20.0/24 subnet, you add a route for the 10.20.30.0/24 subnet that points to the Linux box.

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