Buy or Renew
Buy or Renew
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
cancel
Create a new article
1643
Views
0
Helpful
1
Comments

ASA - Expanding Interface Subnet by changing the Netmask

Cody Ridge
Level 1
Level 1

‎08-21-2012 11:37 AM - edited ‎03-08-2019 06:46 PM

Hello,

I am using an ASA 5510 ver 8.4.1

One of the interfaces is configured with a IP address of 192.168.1.1 255.255.248.0 (/21)

We are looking to expand this subnet to make more hosts available. What would be the implications of changing the interface subnet mask from 255.255.248.0 to 255.255.240.0?

How will the related ACLs and other config entries be impacted by making this type of netmask change on the interface?

Will related entries be deleted?  Or, will I have to just modify related object-groups, ACLs, etc after the change on the interface?

Any assistance would be appreciated.

Labels:
0 Helpful
Comments
jroy777
Level 1
Level 1
‎03-04-2020 12:21 PM

This is crazy that you have over 600 views with no replies. I would expect that there would not be any issues since you are going larger. If you were going smaller, there could be problems. ACL's might be an issue if not modified. I would like to know this as well:)

 

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Customers Also Viewed These Support Documents