Fixing Router and Mobile Hotspot Conflicts > 자유게시판

When you're using a mobile hotspot to connect your devices to the internet you might notice that your home router stops working properly. This is often due to router conflicts with mobile tethers. These conflicts happen because your phone and router are both acting as DHCP servers. Sometimes they end up using overlapping gateway addresses, which causes connection instability.

Start with reviewing your current IP assignments. Look at the subnet range your router is using. Most home routers default to 192.168.2.x. Now check the subnet your phone is assigning when it acts as a hotspot. Many mobile carriers use common private subnets, which causes routing ambiguity. If both devices are using the identical subnet, your devices can't tell which gateway to use, leading to intermittent outages.

Next, try disconnecting your mobile tether and see if your home router works normally. If it does, the problem is definitely related to the tether. Now reconnect the tether and check if any devices on your home network can no longer connect. Sometimes your phone will assign itself the same IP as your router, causing network loop. You can check this by checking the IP configuration in your OS. Look for messages about address already in use.

Many users encounter nested NAT. This occurs when the hotspot creates its own subnet and you’re using a second routing layer. This double layer can reduce throughput and block VoIP services that rely on port mapping. To fix this, you can try flashing firmware to bypass routing. This turns your router into a wireless access point and lets your phone handle network management. Alternatively, you can use the phone as your primary access point, though this may reduce your network's range.

Review your hotspot’s advanced settings. Some phones allow you to select a custom DHCP pool. If you're using a both frequency bands on your router, and your phone is using a nearby Wi-Fi spectrum, signal degradation happens. Try switching your router to a different channel. You can use a channel detection software to see which bands are overloaded.

Perform a full reboot of your network. Sometimes a factory reset of network services clears up cached IP assignments. After restarting, reconnect your devices one by one and monitor the connection. If the problem returns when the hotspot reconnects, you've confirmed the conflict. The best long term solution is to change your router’s subnet to a non-standard range. Try using 192.168.10.x, so it no longer overlaps with your phone's standard 192.168.42.x. This way, your devices maintain stable connectivity.