Cisco ASA 5505 Vlan1 IP change

Unanswered Question
Dec 28th, 2009
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In default mode the ASA 5505 is setup with two Vlan's, one inside and one outside. Vlan1 is the default inside VLan, with IP I would like to change the subnet of Vlan1 tot, but when I do, no Ethernet port is assigned to Vlan1 anymore (was 0/1 - 0/7). What I have done is;

#config t

(config)#interface vlan 1

(config)#ip address

But after that, no Ethernet port is within Vlan1, so I tried the following to assign one (port 0/1);

#config t

(config)#interface 0/1

(config)#switchport access vlan 1

(config)#no shut

But nothing happends when monitoring (#show run) interface 0/1 (no Vlan assigned)

Please help!

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Overall Rating: 5 (2 ratings)
Tim Roelands Tue, 12/29/2009 - 09:48
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Well, I did not solve it....The problem is when the Inside (vlan1) IP has been modified I'm no longer able to connect to the ASA using ASDM. I found on the internet that is has something to do with an DHCP Pool assigned to Vlan1, but Im unable to remove this pool, I guess as a result of leak of knowledge....

Maybe someone can help why changing the default IP of the default Vlan causes this much trouble...Thanks in advance.

Tim Roelands Tue, 12/29/2009 - 13:11
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Well, solved it myself!

It's kind a drastic solution, but it worked. To configure an other default IP for Vlan 1, simply restore the ASA to it factory defaults with the following parameters;

Let's say we like to set Vlan1 to subnet 192.168.10.x instead of (the default) 192.168.1.x

(config)#configure factory-default

Jobs done, happy new year...

todd-nash Mon, 02/01/2010 - 14:51
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Excellent job stendec75 , I was searching for the same issue. I used ASDM to change my Vlan1 IP, but then, after the change, I lost all access to it through ASDM. By posting your own found solution to your problem, you helped me out a ton.

Thank you.

shine pothen Thu, 02/23/2012 - 06:08
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The reason why u lost ASDM connection is once you change the inside ip you have to allow the same ip for

http server enable

http 192.168.x.x inside

If u do not do this the first ip will only be allowed and with the new ip which u given will not have access.

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