Asuswrt_Merlin: double IP for 1 MAC

[george13]

Hi,

I have a few issues since installing the latest version.
First of all, all devices on my LAN have a static IP, 192.161.1.2 ... 192.168.1.99, and the dynamic IP go from 100 to 200.
I have 2 connections, where the device gets the static IP, and, what I don't understand, the devices get in addition a dynamic IP address. How the heck is this possible?

And then, am still stuck with a serious bittorrrent download issue. The problem started after "down grading" from win 8 to win 8.1, and I was convinced that it was a win 8.1 issue, but I also installed the latest asuswrt-merlin after the change to win 8.1.
Before win 8.1 and latest merlin, I had download speeds up to 1.2 Mbps, and now I don't get above 15 kbps. I have checked all of my settings, and they are unchanged from before the change. Is this issue maybe related to the double IP issue? I'm lost, and I would appreciate any help I can get.

 

[RMerlin]

Hi,

I have a few issues since installing the latest version.
First of all, all devices on my LAN have a static IP, 192.161.1.2 ... 192.168.1.99, and the dynamic IP go from 100 to 200.
I have 2 connections, where the device gets the static IP, and, what I don't understand, the devices get in addition a dynamic IP address. How the heck is this possible?

How are you determining that your devices have two IPs?

 

[george13]

That's what the GUI's Client Status shows me. For example, My laptop (wireless) has the static IP 192.168.1.6 and it is given the second IP 192.168.1.106, which is in the dynamic range. And my TV decoder (wired) has the static IP 192.168.1.98 and gets the additional IP 192.168.1.189, which is again the dynamic range.

 

[RMerlin]

That's what the GUI's Client Status shows me. For example, My laptop (wireless) has the static IP 192.168.1.6 and it is given the second IP 192.168.1.106, which is in the dynamic range. And my TV decoder (wired) has the static IP 192.168.1.98 and gets the additional IP 192.168.1.189, which is again the dynamic range.

If your clients are getting allocated IPs, then it means they are set to DHCP, not static. Unless you are mixing up static IPs and DHCP reservations, which are two totally different things.

 

[RogerSC]

Could be getting double DHCP somehow, like something other than your main router is allocating DHCP addresses to clients that already have reserved static addresses in your main router. Other than that, doesn't sound possible, since your client static addresses are reserved via MAC addresses in your main router. And your main router would not give the client with that MAC address a DHCP address as well as the reserved static address it already has.

 

[george13]

Thank you for the replies. I'm a bit confused about static vs DHCP reservation. The way I have it set up is that under the LAN - DHCP server tab, I enable manual assignment, followed by the list of MACs and corresponding IPs. So, are we then talking about DHCP reservations, or are they static?

 

[RogerSC]

Thank you for the replies. I'm a bit confused about static vs DHCP reservation. The way I have it set up is that under the LAN - DHCP server tab, I enable manual assignment, followed by the list of MACs and corresponding IPs. So, are we then talking about DHCP reservations, or are they static?

Generally speaking, when you reserve an address, you reserve a "static" IP outside of the DHCP pool of addresses. While it isn't a static address on the internet, it is a "static" reserved address behind your router firewall. For example, my DHCP pool of addresses is from 192.168.1.100 - 192.168.1.250. Then I reserve "static" addresses going down from there, starting at 192.168.1.99.

Sorry to confuse, hopefully this explains things.

 

[jlake]

Hi,

I have a few issues since installing the latest version.
First of all, all devices on my LAN have a static IP, 192.161.1.2 ... 192.168.1.99, and the dynamic IP go from 100 to 200.
I have 2 connections, where the device gets the static IP, and, what I don't understand, the devices get in addition a dynamic IP address. How the heck is this possible?

And then, am still stuck with a serious bittorrrent download issue. The problem started after "down grading" from win 8 to win 8.1, and I was convinced that it was a win 8.1 issue, but I also installed the latest asuswrt-merlin after the change to win 8.1.
Before win 8.1 and latest merlin, I had download speeds up to 1.2 Mbps, and now I don't get above 15 kbps. I have checked all of my settings, and they are unchanged from before the change. Is this issue maybe related to the double IP issue? I'm lost, and I would appreciate any help I can get.

I had the same exact thing with the double DHCP and static address and .34_2. It has nothing to do with windows 8, because I don't have windows 8 on any of my computers.

I hate to call it a bug because it's probably more of an anomoly. Any time that you update the firmware, you should always powercycle the ASUS router out of habit. I don't always practice what I preach. As soon as I powercycled, it went away and never returned. If power cycling the router doesn't work, then reset it to defaults and configure it manually from scratch.

I'm using RT-N66U.

Note: I am no longer using 34_2 and went with 34_2_sdk5 for the time being.
And I don't use the manual assignment (reservations) feature

 

[Nerre]

Isn't it just that the status page shows an IP address no longer used by the device, because that IP address was not correctly released?

If a device gets an IP address and then is disconnected without the possibility to release it (for example if you just pull the plug), the DHCP server will still think the IP address is in lease. I'm not sure the DHCP server is "smart enogh" to release it when the same MAC requests another IP address.

 

[george13]

Interesting, and thank for sharing.
I have already gone through the factory reset and power cycling, and it doesn't change a thing. After a reboot, everything will be as configured, but if I check half a day later, then I'm stuck again with the 2 IPs. What is weird though, is that from the 8 connected devices, it's always the same two that have the double IP, a laptop, connected wireless, and a satellite TV decoder, which is active 24/7.
Regarding the static/DHCP, my DHCP IP pool is as I mentioned 100-200, and the IPs which I set are outside of this range.

 

[CooCooCaChoo]

Have you tried disabling the DHCP server to see if it still exhibits the same behavior?

 

[RMerlin]

A static IP is when you configure it directly on your computer or device. There is no DHCP involved then.

A DHCP reservation is when you allocate the IP on the DHCP server (in this case, your router) to ensure that the DHCP request will always get returned the same IP. You are still getting a dynamic IP (DHCP = Dynamic Host), it's reserved so you always obtain the same IP.

Do you determine you have two IPs by looking on your client itself, or on the router's client list? The client list might not always be accurate.