You can do this without VLANs and without supernetting.
Just add the subnet and add a route in the ASA.
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Add Second Subnet to Internal LAN
Hello Experts -
I have a small local network that has numerous IP devices and I need more addresses. Currently, we're using a 192.168.4.x/24 subnet but would like to also use 192.168.5.x/24. All addresses on the new subnet will be static but will need to have access to the internet. All the switches we have are Cisco Catalyst 2950 and outbound traffic goes through a Cisco ASA 5510.
Is this possible without using VLANs? If so, how?
Thanks in advance.
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Answers
Hi,
Maybe you could have two inside interfaces.
e.g.
int e0
ip address 192.168.4.1 255.255.255.0
nameif inside
security-level 100
int e1
ip address 192.168.5.1 255.255.255.0
nameif inside1
security-level 100
same-security-traffic permit inter-interface
you need the same-security-traffic permit for internal communication between subnets.
You'll need additional NAT configuration for the new interface.
Yes, this is possible too and obviously quicker to implement.
The only probem is that this way communication between the two networks would be slower, seeing that all the traffic would pass through 2 fastethernet interfaces instead of using direct links created dinamically from the switches. This setting could also overload your asa wich, from my point of view, should take care of other matters than routing between private networks. Anyway it all depends on the amount of traffic that your devices will generate.
When changing the subnet mask, would I only need to change the devices which I want to be able to communicate between the two subnets? For example, the production servers would not need to communicate with the devices on the 192.168.5.x/23 subnet. Could they continue to have a 255.255.255.0 mask?
Thanks for your fast response.
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by: caste381Posted on 2009-10-04 at 06:30:35ID: 25489132
Hi!
what you need to do is use supernetting or subnet aggregation. In order to make 192.168.4.0/24 and 192.168.5.0/24 as part of the same network all you need to do is change the subnet mask from 255.255.255.o to 255.255.254.0. This way the hosts from 192.168.4.1 to 192.168.5.254 will belong to the same 192.168.4.0./23 network. Don't forget to modify switches and asa as well.
Bye!