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Forum Discussion
Cannot apply IP filtering with subnet mask on VLAN
Dear all, When I want to configure my Insight managed switch such that devices on certain VLAN's cannot reach certain IP's, a direct declaration of an IP address in the IP filtering section works...
Thanks for the reply, I don't know why it says 'Allow' in the UI but it is in fact in the policy 'Deny', when I edit an entry in the 'Deny' policy it always shows 'Allow' for unknown reasons. Denying access without defining a subnet mask works, only when defining a subnet mask I encounter this problem.
Hello,
See screenshots:
Logging into my Insight account and going to the VLAN > IP Filtering. I do see the deny policy as it is a drop down. After delecting deny, and selecting manual. I can add a deny policy.
Even when you select the deny policy, and select manual, do you see the policy screen for deny or allow?
Yes, 'Deny' is selected. I think the 'Allow' part is just a UI bug that shows after I edit the policy, so please don't pay attention to that. I know in fact that the 'Deny' policy is working because when I block a singular IP address, that IP address is correctly blocked but when I apply a subnet mask it doesn't work anymore.
I've attached a screenshot showing I'm editing the 'Deny' option in the background, with the UI bug on the foreground. So this is not what causes the IP filtering rules to not work specifically when applying a mask.
Just to be clear, the above works, but when applying an IP mask (using the range of devices option), it does not work.
Hello,
Discussing with engineering, try using a reverse IP mask. In the IP mask field try 0.0.0.255 and let me know if that helps.
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