Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member


Hi Experts,

I need your assist to sort it out V-Lans issue which we have just placed on Cisco ASA 5505 FW and doing testing but not able to find out the root cause:

Current Scenario:

1) V-lan 100 NOC

2) V-Lan 200 DEV

Prior to setup V-Lans we setup only one NOC V-lan and all client machine are located on the same V-Lan. Now I have created a new V-Lan (DEV) and opened all necessary ports to start communication between both V-Lans and everything is working fine except the following issue:

Issue: Microsoft Active Directory Server is located on NOC V-lan and assigned IP is and when I connect my laptop on NOC V-Lan and setup a static IP which is then I can rejoin the domain without facing any issue but other than when I connect with DEV V-lan and setup a static IP then laptop doesn't join the domain. Now I have opened IP protocol between both V-lans and nothing is blocked and DNS is also being resolved and when I try to resolve the DNS then the logs are being created on FW. While i press enter to join the domain from client machine and the logs must be created instantly which are not being created. Could it be a inspection issue?

Request you to provide your inputs to get it resolved ASAP.


New Member

Re: V-Lans

Can anyone respond???

We need urgent support.

New Member

Re: V-Lans

What do you have your MTUs set up to be? Also, I assume that you are trunking these VLANs? What is at the other end of the trunk? A partial config would help, too.

I never had to do anything special with inspection to get this to work, btw.