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can IP address be given to CISCO Router CISCO Firewall and Mail server from the same IP address pool

Posted on 2016-09-01
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Last Modified: 2016-09-21
I am asking this question because the vendor supporting our CISCO Router & CISCO Firewall (ASA) is telling me that this can not be done and we should have one more IP pool
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Question by:Ramesh Satija
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Expert Comment

by:Dr. Klahn
ID: 41779588
Are you asking about the outward-facing IP or the inward-facing (LAN) IP?
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rauenpc earned 500 total points (awarded by participants)
ID: 41780183
As a general rule, you can't have the same ip pool, specifically a subnet, assigned to two different interfaces on the same device. So an ASA can't have the inside and outside interfaces configured with 10.0.0.0x/24 because they overlap.
So if you have Internet-ASA-Router-LAN, every spot between devices needs to be a different subnet or it will cause either a routing issue or it plainly won't be allowed on a device.
Now to go off of what Dr. Klahn was getting at, if you want to use a single Public IP address pool, and assign individual IP's to go to other devices behind the firewall, that is a simple matter of configuring NAT.
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Author Comment

by:Ramesh Satija
ID: 41781101
Thaks both of you for further comments / info. To answer Dr Klahn' query on my question, I am talking about outward Ip as well as inward -facing (LAN) IP, because all our ISP has given us one public IP Pool of 16 IP addresses, and no additional public ip for outward or WAN IP.

However after reading the detailed comments / suggestions of Mr rauenpc, I will discuss with my CISCO support vendor and then give further comment

Thanks to both of you for help
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Expert Comment

by:Dr. Klahn
ID: 41808385
System requested close
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