IPS mode vlan inline and VLAN 1
I am installing a 4255 IPS in pair mode for the vlan inline, but I encountered a problem.
The thing is that we have a network with multiple VLANs. Some of the servers as well as some users are connected to VLAN 1. The servers are connected to a separate switch.
I would like to isolate the servers behind the IP addresses.
I created a new vlan 90, paired with the VLAN 1 on the IPS and placed the server in the new VLAN 90. But this doesn't seem to work.
I have tryied to put the trunk of the IPS on the main switch on the switch where the servers are located, but in both cases, it did not work.
I noticed that this configuration seems to work with VLAN different VLAN 1 but I can't make it work with the VLAN 1.
Does anyone have an idea what could be the problem?
Thank you.
VLAN 1 is by default the Vlan for the trunk port native.
Traffic vlan native out of the port trunk will not have a header vlan.
So when the sensor receives the traffic it cannot change the header VLANs for vlan 90.
The sensor will not add a header vlan for packets that do not contain not one.
If you have two options.
Either use a vlan different from 1.
Or the easier method is to change your switch configuration so that a vlan different is defined as the Vlan for the trunk port native.
Each switch may be different in order to designate the vlan for the trunk port native.
For the Cat 6K running IOS is "switchport trunk vlan native.
Tags: Cisco Security
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