Solved

Firewall configuration - problem with subnets

Posted on 2014-10-15
2
196 Views
Last Modified: 2014-10-15
I am trying to replace and old firewall with a new version (4 years younger software).

The old firewall had the LAN subnet set to 192.168.1.254/24

whereas the new firewall (that is not working correctly) is using

a LAN subnet of 192.168.1.0/24

What is the difference between the two subnets - I thought these were both the same ?
0
Comment
Question by:tigger44
2 Comments
 
LVL 25

Accepted Solution

by:
Ken Boone earned 500 total points
ID: 40382930
There is no difference.  In the old firewall it was actually using a host address with the subnet mask combo to identify the network.  It does this internally by performing and AND operation with the host address and the subnet mask which will result in 192.168.1.0.  

In the new firewall it is referred to in its most common format of using the network address / subnet.

Same subnet however, the syntax for putting it in might now require the actuall network address which is the normal way to do things...  Doing it the way it was done in the old firewall tends to confuse people.
0
 

Author Closing Comment

by:tigger44
ID: 40382939
Many thanks - it certainly confused me !
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
SonicWALL SIP Transformation Problem 4 113
Shoretel SIP Trunks failing to work after migrating internet/firewall 10 89
Allow IP range in sonicwall 1 25
Sonicwall SHA issue 4 40
Article by: rfc1180
The Maximum Segment size (MSS) is an important consideration when troubleshooting connectivity via the Internet/Intranet. As the packets are routed via the Internet/Intranet, the packets must traverse through multiple routers in the path between two…
Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question