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Cisco PIX 501: Ouside/Inside on same subnet?

Posted on 2006-11-08
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Last Modified: 2013-11-16
All,

Is it possible to have an outside IP of 192.168.1.100/24 and an inside IP of 192.168.1.101/24?

I am securing a network segment and I want to do this so that all PCs outside the firewall have 192.168.1.2-99/24 and all PC's on the inside have 192.168.1.102-199/24 and I can restrict the traffic between the two segments.

All IP's on my network are static and I will not be using the PIX's DHCP feature on the inside.

Thanks!

Mike
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Question by:jbisordi
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Pete Long earned 1000 total points
ID: 17901239
No but you can use

192.168.1.0 / 25 (thats 255.255.255.128)

then subnet 1 would b

192.168.1.1 to 126

and subnet 2 would be

192.168.1.129 to 254

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by:Pete Long
ID: 17901326
Network address        Subnet                      Subnet Size             Usable IPs                                   Broadcast address
192.168.1.0      255.255.255.128      126                    192.168.1.1  to  192.168.1.126      192.168.1.127
192.168.1.128      255.255.255.128      126                    192.168.1.129  to  192.168.1.254      192.168.1.255
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by:Pete Long
ID: 17901331
^^^^^^^^formatting screwed up but you get the picture
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by:jbisordi
ID: 17901393
Thanks for the info Pete.

So just to be clear: it is not possible to place my 501 between two networks that use the same subnet, even if the IP's on the interfaces and the clients on each site are all unique...is that correct?
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by:Pete Long
ID: 17901701
Thats correct yes  
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