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What happen in my network architecture?

11 New Member
Hi, I'm MaskerTim.
and I attach a diagram about my network architecture and what problem I have.

Under the premise on my network setting:
  1. All firewall in host I close.
  2. I set some route table. (That describes in picture)
  3. Device A at the LAN side can succeed to ping to Server A at the WAN side, however, Server A didn't ping successfully to Device A. (Also in picture)

I don't know why fault it is?
Jun 25 '20
15 4738
9,065 Recognized Expert Moderator Expert
So the DIR-859 is a standard consumer router providing connections out to a WAN (broadband) as well as wired and wireless connections internally on the same network.

The routes you have set-up in the Wireless router are doing nothing because they concern the WAN port which is not in use. I can tell if you have a separate switch or if you are referring to the switch with-in the router providing the 4 gigabit Ethernet ports but the assumption in a router of this type is what everything is on the same subnet (because that is what is simplest for most consumers).

By giving your server a static IP in a different sub-net you are placing it on a different sub-net to everything else hence it can communicate with nothing.

By setting a static IP on the WAN in the router you have statically set the IP address of the WAN port, but note this is not the Ethernet ports that your wired network is using. Additionally if this was actually connected to a WAN you would almost certainly have broken the link as most networks expect equipment to request an IP address not set one statically.

To make this topology work with this equipment your best option is to switch on DHCP in your server, it will then obtain an IP address from the router putting it on the same subnet as the router and all the wireless devices.

If you want a topology with different sub-nets then there are a number of options but all of them involve buying new network gear.
Jun 26 '20 #11
11 New Member
Don't worry about buying network gear, we have a lot Ethernet switches in our lab. So if I would like to one side using wireless and the other side using wired (Ethernet), I need to put Server under the Switch (Server wired to Switch), then Switch plug into wifi router's LAN and Device use the wifi router's DHCP assigned. Server set static IP to split its sub-net.

If I build what I talk above, is that concept correct?
Jun 26 '20 #12
11 New Member
Just like what I draw.

That is my reconstruct I think.
Jun 26 '20 #13
9,065 Recognized Expert Moderator Expert
If you put the server on anything other than the subnet the router is on then it will not work; what you are battling is the router which is incapable of handling anything other than a single subnet.

If you are in a lab with bits a pieces lying around then what you could do is

Find some PC/Laptop/Box with 2 Ethernet ports (you can always add ports with a USB to Ethernet) Connect 1 port to the Wireless router using DHCP and the other port to your switch.

You now have 2 separate phsyical networks with a computer between them; I would install Linux on this computer (Windows may be able to do this I'm not sure, Linux can). This computer is going to bridge the 2 networks (i.e. connect them together).

On the computer
  • Configure the port connected to the router to use DHCP so that it is part of the routers subnet (you can configure the router to always give it the same address (normally)).
  • Give the port on the wired network a static IP in the same subnet as the router.
  • Set up the routing table to route packets from 1 port to the other

On the server
  • Configure it with a static IP address in the subnet of the wired network
  • Configure the bridge computer as the gateway for the other network using its IP address on the wired network

On your wireless devices connected to the router
  • Configure the bridge computer as the gateway for the wired network using its IP address from the router

Modified picture attached
Jun 26 '20 #14
11 New Member
You give me a clear point, the Bridge. I forget that concept. I would try this architecture in lab when the work days start. The lab is closed during these days (because of the holidays in my country), so I can't entry my lab. That's why I can only image what it would run.

After Two days later, I would try it and then reply the result whether it is success or not.

Thanks Banfa. You give me a big advice. And the diagram you redraw makes me have a way to try.
Jun 26 '20 #15
11 New Member
Okay, I succeed to do it!! Thanks for your help.
Jun 29 '20 #16

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