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VLAN Security
Hi. I have 8 GS728TP ProSafe switches (and a couple of GS752TP's) in the company network which I have setup using VLAN 1 for the data network, PC's, Laptops etc and VLAN 2 for the telephone system pl...
Hi again,
The ACLs you are looking for are called extended ACLs. They are numbered 100-199 and can be created by going to: "Security" --> "ACL" --> "Advanced" --> "IP ACL" --> In the "IP ACL ID" type 100 and click "Add".
This will create rule table 100. Now, you can add rules to the table as you wish. Go to "IP Extended Rules" and you can see your table here. You can start adding rules.
Once you have the rules you need, then you can bind the rules to ports via the menu "IP Binding Table".
A few notes about ACLs.
1. They use wildcard masks instead of subnet masks.
2. ACLs are read from top --> bottom. This means specific rules on top, general rules at the bottom.
3. Remember that the default (hidden) rule on an ACL is "Deny All". What you want is block some stuff and allow the rest. This means that your last rule should be Permit All.
4. The ACL direction is Inbound on these switches. That matters for how you create the ACL :)
5. Only bind the ACL on the relevant ports. If you bind it to all ports and you make a mistake, you might block access to the switch itself, which you in turn can't recover from (as the ACL is applied on all ports and there is no console port on these models).
Here is a Netgear KB about it: https://kb.netgear.com/21714/How-do-I-set-up-an-IP-Access-Control-List-ACL-with-two-rules-using-the-web-interface-on-my-managed-switch
Cheers!
Hi John,
Thanks for the response but what you're telling me doesn't seem to make sense?
If I use the switch IP address on the VLAN as the gateway IP for the devices on that VLAN (the switch itself has a separate gateway which is a firewall/router) then devices on both VLAN's can communicate with the other as the switch is obviously aware of both IP address ranges. Any requests for resources that aren't on either VLAN are then passed to the Firewall/Router and out onto the internet etc. which is how I need it to work and it does.
The problem I have is that I only want specific devices on each of the VLANs to be able to communicate with devices on the other. Would this be as easy as makng sure that the gateway IP's on the specfic devices take them to the switch whereas all other devices have a gateway IP that takes them directly to the firewall/router?
Regards,
Tom Burbury
It would not work with this setup as these are 2 different networks. The switch's IP is different from the devices connected to it. We cannot let specific devices to communicate to other subnet unless routing is enabled on your network. Even if you change the default gateway on each device, it would still not work as it doesn't have a route towards the other network.
Regards,
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