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Router blocks Traffic to the internet if the IP-Adress is not from his own subnet

Router blocks Traffic to the internet if the IP-Adress is not from his own subnet

Router blocks Traffic to the internet if the IP-Adress is not from his own subnet
Router blocks Traffic to the internet if the IP-Adress is not from his own subnet
2025-08-28 18:56:14 - last edited 3 weeks ago

I have a TP-Link Archer BE800 (BE19000) with the network address 192.168.0.0 to which a TP-Link SG3210X-M2 is connected. This managed switch forms its own subnet (192.168.10.x). Computers in this subnet can ping the switch and the BE800. I also have access to the computers from the 192.168.0.0 network.

 

Problem: The BE800 apparently blocks all Internet traffic that does not come from its own subnet 192.168.0.0. I have checked this several times with pings and DNS queries. As soon as I assign an address from the 192.168.0.0 network to a computer from the 192.168.10.0 network, it can access the Internet. Otherwise, it cannot.

 

I haven't found any settings on the BE800 (the firewall section is a joke for such an expensive WLAN router!) where I could disable this behavior or create a rule.

 

Does anyone else have this problem, and if so, how did they solve it?

 

2 old 4 this sh** ;)
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#1
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Re:Router blocks Traffic to the internet if the IP-Adress is not from his own subnet
3 weeks ago

  @Threadripper 

You should set up a routing entry on the switch.

 

DST 

0.0.0.0/0 

 

Next hop

192.168.0.X, your switch IP in the 192.168.0.0/24. 

 

And, if this does not work, you may face a problem with the NAT on your router side. 

Some guides explaining this:

https://www.tp-link.com/en/support/faq/887/

https://community.tp-link.com/en/business/forum/topic/656144

I specifically pointed out this in the guide I wrote, in the note area. 

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#2
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Re:Router blocks Traffic to the internet if the IP-Adress is not from his own subnet
2 weeks ago

The Problem was deeper. The BE800 doesn't support Multinet. So i have to buy a Gateway-Router, which i did, and this solved my problem.

2 old 4 this sh** ;)
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#3
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