• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 352
  • Last Modified:

Cisco PIX 501: Ouside/Inside on same subnet?

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
0
jbisordi
Asked:
jbisordi
  • 4
1 Solution
 
Pete LongTechnical ConsultantCommented:
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

0
 
Pete LongTechnical ConsultantCommented:
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
0
 
Pete LongTechnical ConsultantCommented:
^^^^^^^^formatting screwed up but you get the picture
0
 
jbisordiAuthor Commented:
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?
0
 
Pete LongTechnical ConsultantCommented:
Thats correct yes  
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Worried about phishing attacks?

90% of attacks start with a phish. It’s critical that IT admins and MSSPs have the right security in place to protect their end users from these phishing attacks. Check out our latest feature brief for tips and tricks to keep your employees off a hackers line!

  • 4
Tackle projects and never again get stuck behind a technical roadblock.
Join Now