Change LAN IP from Luci do not apply

[quirino1977]

I have an old TP-Link TL-WR741N/ND v4 already running OperWRT OpenWrt 18.06.8 r7989-82fbd85747 / LuCI openwrt-18.06 branch (git-20.029.49294-41e2258).

Now i got a TP-Link Archer C50 and installed OpenWrt 19.07.2 r10947-65030d81f3 / LuCI openwrt-19.07 branch git-20.057.55219-13dd17f. But i cannot change LAN IP through Luci. After click on apply, it says no comunication and rollsback. And never finish the roll back, so, i don't get the options "apply unchecked", but if you try the old IP after some time, is works. So i changed the IP via SSH directly at /etc/config/network

Looks like this post, but i didn't got a fix.

Changing the LAN IP results in Luci never done loading (solved)

Got this weird issue on my Fritzbox 4040. To reproduce simply do a clean install and after first boot login to the website interface or ssh and change the LAN IP from 192.168.1.1 to some other range like 10.0.0.1, reboot and try to login. You will be able to login but Luci will be forever loading the interface. If I change the IP back and reboot Luci loads again. A real head scratcher. I've tried it several times with snapshots, trunk and the .2 release. They all exhibit the same behaviour. Re…

I tried it also by plugging the cabe just between PC and the router. Same problem.

This is not a big issue since it's rare to chenge the LAN IP, but it's still a issue. Or am i doing wrong?

LAN and WAN are not on the same subnet (WAN is PPPoE).
After i apply new LAN IP, even if i set the new subnet at PC, it still do not ping new LAN IP even once.

Had checked some threads but the only solution is to edit /etc/config/network.

Auto rollback - No "Apply Unchecked" box

Yes, I did try changing IP address on PC to be on new subnet to see if I could see the hub on new LAN IP address, but it made no difference, as hub was not visible on new IP address. As far as I'm aware, I think the 'Apply Unchecked' dialogue box should appear 'before' the LAN IP address is forcibly changed on the hub, when it has worked. No luck yet in finding a way to disable auto-roll back after searching github. Looks like it cannot be disabled, but I could be wrong. Update (2 Oct 2018)…

[Solved] How to correctly change router LAN's IP address?

I agree it works on YOUR equipment. It doesn't work for me or the OP as stated. Just a simple change to the router subnet to not conflict with the At&t modem/router. My experience 10+ years Cable Dog; 9 years Enterprise Network Engineer if that helps resolve some silent questions.

[Hegabo]

The default LAN IP of OpenWrt is 192.168.1.1.

If a user changes that IP in LuCI, this is deliberately designed to ensure that the new IP is accessible by the device after the user applies the change.

If you are confident that the new IP is correct, you have a few options around that. Please refer to page https://openwrt.org/faq/change_lan_ip

[quirino1977]

Thankyou. Got it.

In fact, i'm changing subnet. The problem is that the dialog box "Apply Unchecked" do not show. When/where should it appears?

I had tried already having 2 IPs. On by cable (old subnet) and one by Wifi (new subnet). But i still couldn't reach the new LAN IP. I made the change pinging both old and new IP but new one never respond. I´ll try again just do be sure. (By the way it's already working). Next i will install Open WRT on my Xiaomi MiWifi. Maybe it would be wiser to use the default open WRT subnet.

[psherman]

Can you describe what you want to achieve? You mentioned that you want to create a second subnet... what will that subnet be used for (for example, some people just like to have wifi on a separate subnet vs wired, other people are looking to create a guest or IoT network or something).

If you're looking to put wifi devices on a separate network relative to wired, this can be done, but it can at times make certain things more complicated (such as file sharing, printing, streaming media from one device to another, etc.).

[quirino1977]

Sure. I don't want 2 subnets. It's just my main router (and another dumb AP, and also this one before flashing OpenWRT) is on another subnet. So it's easier to change just one. But i will end up putting all in the OpenWRT default. I will now try to get some time to flash the Xiaomi router.

[vuhuy]

Lot of text, do you just want to change the LAN IP on your OpenWRT box and the changes doesn't apply and keeps rolling back? Just change the LAN IP using SSH. Use SSH to login to your OpenWRT.

Edit the configuration directly

vi /etc/config/network

Adjust the line (press i to enter INSERT mode to write)

[..]
config interface 'lan'
        option ipaddr '192.168.200.1'
[..]

Press esc to leave INSERT mode and write :wq to save and quit VIM. Restart the network interface.

/etc/init.d/network restart

Alternatively, use the UCI interface

uci set network.lan.ipaddr='192.168.200.1'
uci commit 
/etc/init.d/network restart

I can't really grasp what you want to achieve. Yes - it's a bug. The rollback option should check the new set IP if the LAN address changes. It doesn't, and therefore the changes are reverted. No, you can't use the same subnets on your OpenWRT router and the upstream router. It's not how IP networking works, especially if the downstream router needs to communicate with the upstream router.

If you want to avoid two subnets, take a look if it's possible to run your upstream router in some kind of bridge mode so it's running like a modem. Or just disable DHCP on the upstream router and let your OpenWRT handle the DHCP. In that case, run your upstream router on 192.168.1.1/24 and OpenWRT on 192.168.1.2, and just connect your OpenWRT router to your upstream router via a normal ethernet port and not the WAN port.

But there's really no problem to run the upstream router on 192.168.1.1/24 and the downstream router on 192.168.2.1/24 and two subnets.

[quirino1977]

@vuhuy

Lot of text

If i don't write details, some complain about a lack of info. Sorry if i texted too much.

@vuhuy

Just change the LAN IP using SSH

That's what i did. It's in my first post.

@vuhuy

No, you can't use the same subnets on your OpenWRT router and the upstream router. It's not how IP networking works, especially if the downstream router needs to communicate with the upstream router.

I don't need or want 2 subnets and don't need or want a upstream/downstream router. I just have one main router and 2 dumb APs.

[vuhuy]

Wait, so your OpenWRT router is directly connected to a modem with the WAN side configured as PPoE? Post a screenshot of the status page in LuCI.

[quirino1977]

I don't have a modem. My internet is a network cable that provides a PPPoE connection. It's on WAN port of my main AP (Xiaomi - 192.168.0.254). I have 2 others APs (dumbs 192.168.0.253 and 192.168.0.252) connected by cable to main AP, all using LAN port. That all. The only problem was that, after i flashed Open WRT to one of this dumb AP, it became 192.168.1.1 and, when i try to change to 192.168.0.253 using Luci, i got no success. I already did it using SSH and it's working as i want now.

Internet provider ----- PPPoE ------- Xiaomi WAN port ---- Xiaomi LAN port ------- Dumb AP 1 LAN port and Dumb AP2 LAN port.

[vuhuy]

Yeah that's a the correct way to set up an PPPoE connection. No need for double subnets indeed. Sorry I was confused.

So to understand it correcly, you only came here to tell us that LuCI has this weird behavior when changing IPs, and you already have solved the problem by using SSH ?

[Hegabo]

@quirino1977

I had tried already having 2 IPs

How about just using dynamic IP (cable or WiFi like normal), but as soon as you apply the change you disconnect and reconnect to get a new IP, and then you edit the browser address to the new IP.

[quirino1977]

@vuhuy

you only came here to tell us that LuCI has this weird behavior when changing IPs

Sort of. Maybe i was doing something wrong. Anyway i'm not getting the message box "apply unchecked". It's because the previous version (on my older dumb AP) do not have this behavior and i got confused.

@Hegabo

How about just using dynamic IP (cable or WiFi like normal), but as soon as you apply the change you disconnect and reconnect to get a new IP, and then you edit the browser address to the new IP.

I had tried to access by new IP but even ping was working on new IP. It was like "dead" and i had to wait some time (much more than 90 seconds) before old IP started to answer. I will make some tests this weekend and let you know.

[Hegabo]

@quirino1977

i had to wait some time (much more than 90 seconds) before old IP started to answer.

I think this means that there is something wrong beyond any issue with the GUI.

[quirino1977]

I just installed Oper WRT on my Xiaomi Mini. So, as i told, now all my 3 APs are Open WRT and i decided to use the default subnet (192.168.1.x). But i want the last IP to the main router (192.168.1.254). I changed it (from 192.168.1.1 to 192.168.1.254) and other things like SSID, security, WAN and apply. It had the same behavior (reverted ALL the config) . No message box "apply unchecked". So i changed all but LAN IP before and tried again (maybe i'm to used to 192.168.0.254 and inserted it by the habit). This time i was sure to insert 192.168.1.254. IP final 254 respond while final 1 stopped. After some time, same error but this time at least i got the "apply unchecked" box and it worked. I got that this is to avoid inserting an IP that i could not have access (which could be a big problem if i'm remote). But looks like it's not working at all, even with IPs in the same subnet.

I will now change the TP-Link subnet to 192.168.1.x and check the behavior.

Ps. no game for me. Same problem. Even to set LAN to DHCP client do not work using Luci. What's the deal? Do Luci have to receive a connection on new IP in order not to roll back?

[Hegabo]

@quirino1977

Do Luci have to receive a connection on new IP in order not to roll back?

What happens if you edit the IP address in the broker address bar to the new address (before the 30 seconds end)?

[quirino1977]

@Hegabo

What happens if you edit the IP address in the broker address bar to the new address (before the 30 seconds end)?

It work's fine. And changes remains.

[allengorden]

I have the same problem as you. using the latest Openwrt.