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Configuring aASA5505 for two separate networks using ASDM

Posted on 2015-02-10
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Last Modified: 2015-02-11
Hi I am a not very confident with Cisco ASA 5505 and have managed to get 4 sites connecting to our main site with site to site VPN’s
The network in the main site is on 192.168.0.1 the remote sites are 192.168.8.1, 192.168.6.1, 192.168.10.1 and 192.168.2.1 all works well without problem
We have 7 external addresses with our ISDN and are using two of them one for exchange and one for everything else.
A company is renting some office space from us and would like their own separate network of 192.168.12.1 internally and wants to use one of our spare external IP addresses.
My question is:
Is this possible on a ASA 5505 and would it configurable using the ASDM ?

Thank you in advance.
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Question by:dances1960
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Daniel Sheppard earned 2000 total points
ID: 40601288
The ASA 5505 cannot handle multiple routed networks.  You can create a DMZ, however that is not the best way to go about it if you can help it.

The DMZ isn't 100% bad, it will only mean that the two networks can't exchange traffic.  Not a big deal I suppose.

If you want to try using the ASA 5505 for this, you will need to:

- Configure a second interface with the other companies subnet (or a /30 and add a static route to their subnet through that /30)
- Set the security level
- Create a NAT policy for their systems
- Create a IP Access List to prevent traffic flowing between the two subnets (not strictly required however still recommended for portability)

So to answer, yes it is the possible.  Yes it is configurable through ASDM.
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Author Closing Comment

by:dances1960
ID: 40602597
Wonderful, many thanks Daniel
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