Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?

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Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?
Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?
2019-12-10 14:25:39 - last edited 2021-08-21 06:04:01
Model: TL-ER5120
Hardware Version: V4
Firmware Version: Latest

We were truing to setup a large WiFi Access network in our apartment with EAP models and a Load Balancing Router (from UTT brand) and faced issues. The discussion is here:

https://community.tp-link.com/en/business/forum/topic/178760

 

Per feedback and analysis, it seems the problem is with our VLAN Configuration and VLAN-unaware Wifi Router, due to which clients on SSIDs in our system (totally around 8) each mapped to its own VLAN are unable to get DHCP addresses from the Router, beacuse the EAPs won't support Asymmetric VLANs (two Untagged VLANs per SSID).

 

So we plan to alter the design as below:

 

 

As per this architrecture, we may not need Asymmeteric VLAN support from our Dlink switches, but our Load balancing router needs to be 

 

(1) VLAN aware on its LAN interface. We use a 4xWAN, 1xLAN setup of the UTT router. 

(2) A seperate subnet and DHCP pool for each Wifi VLAN on the router

 

From The user Guide of V8 of this router, we can see that it has support of multiple VLANs with egress tagging of 802.1q VLAN-IDs. But we could not see support for Multiple DHCP server pools, each getting tied to one VLAN interface. 

 

(A) If we replace the UTT router with TL-ER5120 can it handle the above networking scenario ?
(B) Are seperate DHCP servers for each VLAN really required ? Or ER5120 v4 can handle the above case with only 1 DHCP server pool and internally handle the routing of DHCP response back to requesting client based on the VLAN tag the request carried (mapped to an interbala virtual interface probably) ?

(C) Also can the DHCP pools be larger than 256 IP addresses (like 10.0.0.0/16) ? We had a problem before with TL-R480T+ V8, where the pool was limited to 256 IP addreses (like 10.0.0.0.0/24 only)
 

It will be nice if someone can review the entire setup and give feedback.

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Re:Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?-Solution
2019-12-11 02:31:43 - last edited 2021-08-21 06:04:01

@APRC-P3-Tel 

 

As you know, ER5120 V4 support VLAN but cannot provide multiple DHCP server pool. 

ER5120 V4 support up to 1024 IP addresses for DHCP pool. But please note that it's recommended to carry less then 100 clients. So you need to consider your client number as well.

 

In your topology, you can use only one DHCP pool. Just not convenient to distinguish the clients in different WiFi. And different wifi cannot access each other because they are in different VLAN but in the same subnet. They are able to access the Internet.

 

 

 

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Re:Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?-Solution
2019-12-11 07:25:55 - last edited 2021-08-21 06:04:01

@APRC-P3-Tel 

 

1) If the IP address between start address and end address is more than 1024 IP addresses, it should popup saying the max limit is 1024 addresses.

2) Actually ER5120 V4 doesn't limit the clients number. 100 clients is the suggestion from TP-Link. I think it needs to consider NAT sessions and CPU and memory. If your client number is more than 100. It doesn't mean that the router must not work. If your network traffic is small. They still can work. If you has hgih network traffic, and use the advanced function like VPN, the router may even not able to carry 100 clients.

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Re:Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?-Solution
2019-12-11 02:31:43 - last edited 2021-08-21 06:04:01

@APRC-P3-Tel 

 

As you know, ER5120 V4 support VLAN but cannot provide multiple DHCP server pool. 

ER5120 V4 support up to 1024 IP addresses for DHCP pool. But please note that it's recommended to carry less then 100 clients. So you need to consider your client number as well.

 

In your topology, you can use only one DHCP pool. Just not convenient to distinguish the clients in different WiFi. And different wifi cannot access each other because they are in different VLAN but in the same subnet. They are able to access the Internet.

 

 

 

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Re:Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?
2019-12-11 06:56:19 - last edited 2021-08-21 06:04:01

@Andone :  Thanks for your input. We will likely try out this router.  I understand that 1024 theoretical limit and 100 practical  limit  is good enough for any small enterprise, where this product may be targetted at. However , a couple of  further probes questions:

(1) 1024 is a good enough pool for us for now and quite some time in future. If I understand what you are saying. the moment I set the DHCP server pool  (LAN Gateway address is 10.0.0.1 and subnet mask 255.0.0.0) as

 

       start address = 10.0.2.1 

       end address = 10.0.6.254

 

the TL-ER5120 V4 would not accept this and flag an error msg/popup saying the max limit is 1024 address. Same way as the TL-R480T+ V8 did on going beyond a pool size of 256.  Just won't allow a range bigger than 1024 to be configured in the first place Right ?

 

(2) Also what is the limiting factor for 100 clients ? We presently  understand that this may be the number of *simultaneous clients using the Router for Internet service,  and not the actual number of addresses allocated by pool  at any given point of time (dependant on lease period of DHCP). Is it  limit coming because the routing is CPU bound or memory bound ? I  observed that the V4 version of ER-5120 has bumped up the RAM from 512 MB DDR3 to 2 GB DDR3, so is it the CPU now ?

 

To some testing before deployment, yesterday night we built a pfSense Firewall Router  with a quad core J1900 Asrock Mobo, 8 GB RAM, 13  Gigabit NIC interfaces (3 quad-port Realtek cards, 1 onboard Realtek) using some salvaged old parts and initial testing indicates that it maybe able to handle LAN-WAN throughput of  800 mbps -1 Gbps max. But that machine is happy to let me configure a pool size way bigger than 1024 and I have no idea if it will crib if the number of simulatenous users goes beyond 100 or higher/lower number. We will not be using this in a deploymednt environment, beacuse of the learning curve for the system integrator handling our project. 

 

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Re:Can the TL-ER5120 V4 load balancing router support EAP SSID to VLAN mapping ?-Solution
2019-12-11 07:25:55 - last edited 2021-08-21 06:04:01

@APRC-P3-Tel 

 

1) If the IP address between start address and end address is more than 1024 IP addresses, it should popup saying the max limit is 1024 addresses.

2) Actually ER5120 V4 doesn't limit the clients number. 100 clients is the suggestion from TP-Link. I think it needs to consider NAT sessions and CPU and memory. If your client number is more than 100. It doesn't mean that the router must not work. If your network traffic is small. They still can work. If you has hgih network traffic, and use the advanced function like VPN, the router may even not able to carry 100 clients.

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