TD-W9980 static routes not working

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TD-W9980 static routes not working

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TD-W9980 static routes not working
TD-W9980 static routes not working
2015-10-30 19:13:38
Model : TD-W9980

Hardware Version : v1

Firmware Version : 0.6.0 1.12 v0021.0 Build 150507 Rel.40130n

ISP : Sky Broadband

Hi forum.

I'm trying to make use of static routes on my TD-W9980 to route traffic between two private subnets and am having problems.

Here's a crude diagram of my setup:
[CODE] (Internet)
|
|
+-----o----+
| TD-W9980 |
+-----o----+
|.1
|
+-------+--------+----------+--------+ 192.168.128.0/24
| |
|.10 |.20
+-----o----+ +-----o----+
| FBSD g/w | | Web srvr |
+-----o----+ +----------+
|.1
|
+-------+--------+-------------------+ 192.168.255.0/24
|
|.2
+----o----+
| Client |
+---------+[/CODE]

I have configured a static route on the TP-Link router as follows:
- Destination IP Address: 192.168.255.0
- Subnet Mask: 255.255.255.0
- Gateway: 192.168.128.10
- Interface: LAN
- Status: Enabled


The TP-Link router is not properly routing packets destined for 192.168.255.0/24 back through the FreeBSD gateway. For example:

- Client tries to connect to the Web server
- Using tcpdump on the FreeBSD gateway, the SYN packet can be seen passing through and out of the interface onto the 192.168.128.x network.
- tcpdump on the Web server shows the incoming SYN packet and the outgoing SYN/ACK response sent back to 192.168.255.2. The web server has no specific route back to 192.168.255.0/24, so the packet is sent to the default gateway (the TD-W9980)
- The TD-W9980 should route the packet back to the FreeBSD gateway, but...
- The packet is never seen by the FreeBSD gateway

The tcpdumps indicate that the packets are going missing at the TD-W9980.

Anyone else seen a similar issue and figured out what was wrong?
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2 Reply
Re:TD-W9980 static routes not working
2016-02-10 23:02:14
Hi,

I have exactly the same issue on an Archer C7 V2.

Did you find any way to fix this, or do we need to hope for a firmware update by TP-Link?

Might it be working in custom firmwares like dd-wrt?

Thanks
Andi
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Re:TD-W9980 static routes not working
2016-02-19 16:46:46
Just in case someone is interested, here the official statement from TP-Link support:

"This problem is caused by the design of router but not bug. I think the
best solution is to set a static routing on its device but not router."

For me this means: I have to go for a different brand again as I do not concur to this opinion. For me this is a clear bug, my Draytek router does exactly the right thing when putting a static route in. Just not the TP-Link.
A static route which does not work for devices in a network is pretty useless.

So I am very disappointed about the answer, this obvious bug is not a bug but a feature.

Thats how it is, very disappointing.
Andi
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