WAN routed port to another router

[Kik4u]

Hi,

I would like to setup the ASUS RT-AC68U with Merlin firmware behind my ISP router but in a different subnet.

Internet --- ISP Router (192.168.1.1)---(192.168.1.2) (Wan port)ASUS (Lan)(192.168.0.1) --- Devices

As reference, it is a similar setup than this one:
https://github.com/RMerl/asuswrt-merlin/wiki/Access-modem-Web-UI-on-WAN-port-(no-script)

I have setup the WAN port with static IP 192.168.1.2/24 and DG=192.168.1.1. And LAN with 192.168.0.1/24

I have also added an static route on my ISP router: route 192.168.0.0/24 via 192.168.1.2. Checking the routing table on the ASUS I cannot find a Default route. I have also problems identifying the WAN interface when accessing with SSH.

I cannot make it work does somebody knows how can I get it fixed?

Thanks!

 

[ColinTaylor]

What are you trying to achieve here. If you just want your Asus connected behind your ISP router and on a different subnet then it will work out-of-the-box without any configuration other than changing the LAN to 192.168.0.1/24. A static route would only be required if you have devices connected to the ISP router that are trying to initiate connections to devices attached to the Asus' LAN.

 

[jpclarke]

Hi, you can set this up by using a sub interface. Search on my username in this forum and you will see how I made this work

 

[CaptainSTX]

Hi,

I would like to setup the ASUS RT-AC68U with Merlin firmware behind my ISP router but in a different subnet.

Internet --- ISP Router (192.168.1.1)---(192.168.1.2) (Wan port)ASUS (Lan)(192.168.0.1) --- Devices

As reference, it is a similar setup than this one:
https://github.com/RMerl/asuswrt-merlin/wiki/Access-modem-Web-UI-on-WAN-port-(no-script)

I have setup the WAN port with static IP 192.168.1.2/24 and DG=192.168.1.1. And LAN with 192.168.0.1/24

I have also added an static route on my ISP router: route 192.168.0.0/24 via 192.168.1.2. Checking the routing table on the ASUS I cannot find a Default route. I have also problems identifying the WAN interface when accessing with SSH.

I cannot make it work does somebody knows how can I get it fixed?

Thanks!

1. On your ISP router assign a static IP the MAC address of the WAN port on your ASUS. (This is an optional step.)

2. On your ASUS for the WAN set it for DHCP automatic. It will get an IP from the the ISP router.

3. On your ASUS set up the LAN subnet to any subnet besides that of the ISP router. 192.168.0.1 /24 will work.

4. Run a cable from any LAN port on the ISP router to the WAN port of the ASUS.

5. Reboot both routers starting with the ISP router then the ASUS.

You are done.

 

[jpclarke]

Hi, link to how I access my modem interface from internal network.
https://www.snbforums.com/threads/draytek-vigor-130-vdsl-wan-stats-via-router.28044/#post-223660

Change the ip addresses etc. To match your environment and you will need to put the sub interface command into a start up script to keep it persistent after reboot.

Thanks

 

[ColinTaylor]

@jpclarke I think you might be overthinking this. The OP hasn't said that he wants to access a cable modem, only that he wants to put his router behind another router. Hence me asking him to clarify what he is trying to achieve.

@Kik4u You say that you have no default route on the Asus. Are you sure the Asus is in "router" mode and not AP mode?

 

[jpclarke]

Good point, I recommend this anyway as it will allow access to the isp router management.

 

[ColinTaylor]

Good point, I recommend this anyway as it will allow access to the isp router management.

It shouldn't be necessary if the upstream device is just another router. The problem seems to be with certain cable modems used in the US that won't allow access from a non-local subnet. Personally I've never found that to be a problem with devices here in the UK.

 

[jpclarke]

Yeah, you are correct. I had to do it this way as my modem is in bridged mode.

I swapped out my sky fibre router for a modem and ac-3200 router instead.

 

[Kik4u]

Got it working the way @jpclarke and @CaptainSTX said. I had tried before that way but not working, so what I did is to do a Factory Reset a worked directly.

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.1     0.0.0.0         255.255.255.255 UH        0 0          0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0 br0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 eth0

NAT should be enabled on the ASUS, so I guess that in case I don't want to do natting on the ASUS is the case where I need the static route in my ISP's router.

In my case I was something weird on my WAN interface that was fixed Reseting to Factory

Thanks all for the help!