Configuring inside interface with different IP/Subnet

Posted on 2007-10-10
Medium Priority
Last Modified: 2012-05-05

I have an ASA 5505 that I'm setting up. I need to give the inside interface a different subnet ( I've been using the console port to make changes (db9/COM1) from the factory defaults. The problem is when I change the subnet I get locked out from using the ASDM via a LAN port and CAT5, and the DHCP server stops working though I configured it with the new subnet. I can access the firewall just fine via LAN port when it's at factory default, and DHCP works fine as well.

What should I do? thanks!

Question by:Trevor Local
  • 3
LVL 57

Accepted Solution

Pete Long earned 2000 total points
ID: 20055247
COnnect viar COnsole cable like you have been doing

Enter config terminal mode

conf t

Allow the new subnet ASDM access

http 255.255.25 inside

then change the inside IP address

int vlan1
ip address

save your work

write mem

noy you can access the firewall with an IP on the new subnet :)

LVL 57

Expert Comment

by:Pete Long
ID: 20055254
Basically you need to add the new subnet (or IP) to allow ASDM access before you change the inside IP address :)

Author Comment

by:Trevor Local
ID: 20058972
thanks Pete! that was it.
I had to disable DHCP first, before I changed the interface subnet.

Let the games begin!! I'm sure you'll see more questions from me....
LVL 57

Expert Comment

by:Pete Long
ID: 20059979
>>I had to disable DHCP first, before I changed the interface subnet.

Ah that old chestnut :)

Glad you got there - ThanQ

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