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Why my PC connecting to ROUTER instead of MODEM? how can that possible! HELP

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hi,
i have strange issue, its really really strange, i always think how that can actually possible.
i have MAIN modem attached with PC, and i have attached a router to Main Modem.
both lain Wires (PC ethernet cable and Router ethernet Cable) are attached to MODEM,

what is happening that my modem mostly connecting to Router directly, that most annoying part is,
how can that possible, i just connected pc lan to MAIN MODEM PORT, IT SHOULD connect to MODEM,
but its connecting to ROUTER. that driving me crazy..

i always have to Unplug both lan from MODEM, insert one by one, i always need to put pc lan first into modem then rotuer..

i have also changed modem, i got replaced due to this wired issue and this is doing same sht.
if i restart my pc, that will happen again.. then i also have to do that procedure again..

PLEASE HELP..
 
Okay...trying to make sense of what you're saying...hopefully I can help.

You probably cannot have both connected depending on your service, most ISP's will block out only 1 usable IP address which can be used by one device.

Also you WANT to connect this way:

PC > ROUTER > MODEM

The Router has a network firewall which will help keep you protected from some very nasty stuff. Sure the PC OSes have software firewalls, but in some cases they aren't nearly as effective or have a loophole that is more exploitable that could've otherwise been blocked by a router's filtering of traffic.

Your interpretation of what is happening is not very clear to me unfortunately, but please bear with me... but it almost sounds like your router is the only device allowed to resolve a network connection from your Modem and it has issues sometimes. I had an issue with my cable service where my modem and Asus router would fight over the router getting an IP address and thus a network connection. A firmware upgrade later I was able to use an aggressive mode which allowed for me to get an IP address after both the modem and router were power cycled.

Before I had aggressive mode, I would have to connect my PC first, which would get an IP address for my WAN (Internet), then I could connect the router and usually it would then get an IP address.

I would make sure you have updated the firmware on your router, set aggressive mode for the WAN/Internet port if possible.

You however shouldn't have both devices connected to your modem. That can cause conflicts when the service is trying to provide a connection...odds are you have a dynamic IP address for your WAN, which means when that lease renews and it sees two devices, it might stop for a minute to pick which one to give an IP address to. This shouldn't happen...but I've seen varying issues from varying quality ISP's.

If you disconnect your PC from the modem and connect it directly to the router only, do you lose a connection when you reboot your PC?
 
Okay...trying to make sense of what you're saying...hopefully I can help.

You probably cannot have both connected depending on your service, most ISP's will block out only 1 usable IP address which can be used by one device.

Also you WANT to connect this way:

PC > ROUTER > MODEM

The Router has a network firewall which will help keep you protected from some very nasty stuff. Sure the PC OSes have software firewalls, but in some cases they aren't nearly as effective or have a loophole that is more exploitable that could've otherwise been blocked by a router's filtering of traffic.

Your interpretation of what is happening is not very clear to me unfortunately, but please bear with me... but it almost sounds like your router is the only device allowed to resolve a network connection from your Modem and it has issues sometimes. I had an issue with my cable service where my modem and Asus router would fight over the router getting an IP address and thus a network connection. A firmware upgrade later I was able to use an aggressive mode which allowed for me to get an IP address after both the modem and router were power cycled.

Before I had aggressive mode, I would have to connect my PC first, which would get an IP address for my WAN (Internet), then I could connect the router and usually it would then get an IP address.

I would make sure you have updated the firmware on your router, set aggressive mode for the WAN/Internet port if possible.

You however shouldn't have both devices connected to your modem. That can cause conflicts when the service is trying to provide a connection...odds are you have a dynamic IP address for your WAN, which means when that lease renews and it sees two devices, it might stop for a minute to pick which one to give an IP address to. This shouldn't happen...but I've seen varying issues from varying quality ISP's.

If you disconnect your PC from the modem and connect it directly to the router only, do you lose a connection when you reboot your PC?
hi, first of all thanks and thanks alot..
giving your costly time is enough for me..

this is also a strange and hard to describe for me too :P i try to be simple..
i have main LINE at first floor, and its attached the MAIN MODEM(DOCSIS) and i have attached PC cable to that modem,
that DOCSIS modem have less range of WIFI only to my Room,
to expand wifi to Second floor from first floor, i have attached router by Long 70 meter Wire to Router(which is at second floor)
so what is happening, like im in first floor, i have started my PC, and i saw internet not working and Exclamation Sign on ehternet icon and with (Network_2) lable,
then i found that it is actually magically connected to Router, which shouldnt, but the lan wire is attached to MAIN DOCSIS MODEM,
then i always need to do, replug the PC lan wire from Modem then next to Router.
then my pc works and actually connected to REAL MODEM,
i have tried to find aggressive mode but havent found that..
i attached screenshot of router CP...
If you disconnect your PC from the modem and connect it directly to the router only, do you lose a connection when you reboot your PC?
it doesnt matter my pc is running or not because i always need to restart my router when im at Second floor, to access internet.. thats also a topic which i will ask after first..
 

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So your "modem" is actually a router too. You have two routers, and that is likely your problem.

I'm guessing maybe both routers are using the same IP scheme. Change one to use 192.168.1.X and the other to use 192.168.0.X and see if that fixes things.
 
hi, first of all thanks and thanks alot..
giving your costly time is enough for me..

this is also a strange and hard to describe for me too :p i try to be simple..
i have main LINE at first floor, and its attached the MAIN MODEM(DOCSIS) and i have attached PC cable to that modem,
that DOCSIS modem have less range of WIFI only to my Room,

PC Cable = Ethernet cable?

So your DEMARK or point where the ISP's connection ends up is on the first floor. You have the modem/router combo installed there providing LAN and WLAN connectivity.

to expand wifi to Second floor from first floor, i have attached router by Long 70 meter Wire to Router(which is at second floor)

But it doesn't reach your second floor, so that means you have performed a cable run to the second floor and deployed a wireless router at that location correct? I believe I'm following you better now! :)

so what is happening, like im in first floor, i have started my PC, and i saw internet not working and Exclamation Sign on ehternet icon and with (Network_2) lable,

So your PC is connected via ETHERNET or WiFi on second floor?

Do you have both wireless devices running at full wireless transmit signal? If so, the router upstairs might be overpowering the signal downstairs. If so...you might consider turning the transmit signal power (TX Power) down on the Modem/Router combo and even the router upstairs until you have a slight bit of mesh to allow wireless devices to go between each one but not lose connectivity. This isn't a fool proof solution, and depending on device, could be a struggle.

Another thing, is the router upstairs setup as just a router? If so it is running a network within a network, meaning you need a new IP address and DNS rules each time you connect to the router upstairs and then again to the one downstairs. It would be better to setup the router upstairs as an access point. Some have an included mode option, or you can disable firewall, DHCP, DNS. That would then let you use one router for LAN management and the other as a wireless access point to extend your wireless network reach.

then i found that it is actually magically connected to Router, which shouldnt, but the lan wire is attached to MAIN DOCSIS MODEM,

What?

then i always need to do, replug the PC lan wire from Modem then next to Router.

PC lan wire from PC or is this the Ethernet cable I asked about earlier?

then my pc works and actually connected to REAL MODEM,
i have tried to find aggressive mode but havent found that..
i attached screenshot of router CP...

If you open CMD (click start, type CMD, press enter).

Connect to downstairs router via wifi or Ethernet cable, type ipconfig /all

What is your IP address?

Go upstairs and do the same thing...do you have a different IP address?

As @newtekie1 suggested and I did above in this post, sounds like you're running two networks...and that can lead to issues though in many cases not as often as it used to. But depending on your hardware and setup, this could absolutely be the culprit and needs verified and resolved.

it doesnt matter my pc is running or not because i always need to restart my router when im at Second floor, to access internet.. thats also a topic which i will ask after first..

When you restart the router upstairs, do you connect to the WiFi downstairs while it is restarting and that is what gives you Internet and network access? If yes...then our suspicion that you're running two LAN's in your house and it is having issues is likely true.
 
Disable your router's DHCP server functionality.
 
A photo would have cleared up a lot of things.

or a diagram of sorts that prevented me from squinting cause I had to read the original posts 2-3 times trying to get the gist of it :p

But I agree with @newtekie1 that it might be that your modem is also a router and is conflicting with the other router and they are on the same default IP address.
 
I admire your patience and will to troubleshoot problems written in cryptic broken english by not very IT knowledgeable person, guys.
 
The two routers can coexist if the IP address are not similar/same. The way mine are is like this. routerA 192.168.1,1 / routerB 10.10.0.1. If they're having IP conflict you're going to have issues. If they are modern routers you should be able to do what i did. Try powering on the modem first, then power on the main router ( if like mentioned before your main router is a router/modem combo this may be the source of your problem and my method may not be applicable) once the main router is fully powered on, now power on the secondary router . When I do it this way the second router is assigned a dramatically different IP compared to the main router ,as well as all devices that connect to the second AP router also.

I see much more knowledgeable people helping you already but I figured it can't hurt to offer my experience with dual router network .if it doesn't work or it is not applicable just ignore my suggestions

Good luck
 
Sound like a issue of multipul Dhcp servers
I would set a dhcp ip on you Isp Router and a static ip on the Modem(not sure what you talking about though on a modem. firewall?)
Or set modem to Dhcp and router to static ip and make sure they all on same ip range
 
...network within a network, meaning you need a new IP address and DNS rules each time you connect to the router upstairs and then again to the one downstairs. It would be better to setup the router upstairs as an access point. Some have an included mode option, or you can disable firewall, DHCP, DNS. That would then let you use one router for LAN management and the other as a wireless access point to extend your wireless network reach.

I would strongly advise going towards the above as the solution, it's a very good suggestion. If the router has DHCP turned off by setting the rotuer into WAP mode then it would allow the modem to handle the requests thus having a single DHCP source on the network. The main problem as far as I can tell is that the OP has a single layer 2 network segment with 2 x DHCP servers - since the two are not linked (in terms of DHCP leasing) in anyway there is always going to be the chance that the router responds to the DHCP discover request rather than the modem. Also the suggestion of two IP ranges on the same layer 2 network is crazy, that's going to add a whole other set of issues to the problem.

The other possible solution would be connect the router to the modem via the routers WAN port, treating the traffic on that side as dirty, and allow the router to handle DHCP etc. for any device attached to the clean side via ethernet or WiFi. The PC and routers WAN would get their IP addresses from the modems DHCP service and the PC could never get the IP from the rotuer as it would never server up an IP to something it sees on the WAN side. (I'd like to point out that this method would leave the PC somewhat isolated, it would not be able to contact any devices connected to the router but they should be able to contact it)
 
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I admire your patience and will to troubleshoot problems written in cryptic broken english by not very IT knowledgeable person, guys.
Im new to networking, i know how to speak English but this time i wrote in simple language purposely, the issue is so weired that im not even able to describe properly, i have explaned in english but still nobody properly understood, if your son of shakespear then give me free teaching in my pm,
Im overclocker and gamer but im totally noob at network sht,
Thats why im not able to explain properly,



A photo would have cleared up a lot of things.
As i told earlier, im really noob at network things, thats why i posted pic to ask him where is the setting of aggressive mod,
Im not much noob as your quote..

PC Cable = Ethernet cable?
Obviously, pc cable means ethernet cable which can connected to modem,
is there any simple language than that? Im sorry but other guy said i have wrote in broken language, if they arent understanding simple language then its not my fault..

Also I've wrote all things from phone,at mid night which was difficult for me.

Do you have both wireless devices running at full wireless transmit signal? If so, the router upstairs might be overpowering the signal downstairs. If so...you might consider turning the transmit signal power (TX Power) down on the Modem/Router combo and even the router upstairs until you have a slight bit of mesh to allow wireless devices to go between each one but not lose connectivity. This isn't a fool proof solution, and depending on device, could be a struggle.
The wifi is too weak of Main modem which is at first floor,i cant find singles at second floor,
Thats why i added router to main modem to expand the reach of wifi, how simple is that..

Man i don't really know what is dhcp blabla power transmeter,etc

Ok now im not able to quote replies from my phone.
Where you said "what"
Do you know what is DOCSIS MODEM?
that is the type of ips im using, is bascially cable wire which we used to have on tv settop boxes..

or a diagram of sorts that prevented me from squinting cause I had to read the original posts 2-3 times trying to get the gist of it :p

But I agree with @newtekie1 that it might be that your modem is also a router and is conflicting with the other router and they are on the same default IP address.
Yes i have used dlink 2750u modem as router ar second floor.
I would strongly advise going towards the above as the solution, it's a very good suggestion. If the router has DHCP turned off by setting the rotuer into WAP mode then it would allow the modem to handle the requests thus having a single DHCP source on the network. The main problem as far as I can tell is that the OP has a single layer 2 network segment with 2 x DHCP servers - since the two are not linked (in terms of DHCP leasing) in anyway there is always going to be the chance that the router responds to the DHCP discover request rather than the modem. Also the suggestion of two IP ranges on the same layer 2 network is crazy, that's going to add a whole other set of issues to the problem.

The other possible solution would be connect the router to the modem via the routers WAN port, treating the traffic on that side as dirty, and allow the router to handle DHCP etc. for any device attached to the clean side via ethernet or WiFi. The PC and routers WAN would get their IP addresses from the modems DHCP service and the PC could never get the IP from the rotuer as it would never server up an IP to something it sees on the WAN side. (I'd like to point out that this method would leave the PC somewhat isolated, it would not be able to contact any devices connected to the router but they should be able to contact it)
Are dhcp errors which i saw in windows event log because of modem issue?
Im getting lot of errors regarding dhcp and disturbedcom,

If yes please tell me how to properly fix it step by step because im not having much knowledge about network.

Peoples havent understood simple language which i wrote purposely, so i made digaram to explain practically,
Now need to write like shakespeare..


One thing to note please dont mind if i do mistake while typing, i have bought new phone i have less habit of this phone before i was using s7 edge keyboard was wide and now its too short on the new phone.
 

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If yes please tell me how to properly fix it step by step because im not having much knowledge about network.

Look up the manual for the Dlink router and find out how to turn off DHCP or to turn on some kind of wireless access point mode so it doesn't work as a full router... you can't have 2 DHCP servers on the same network segment (which is what you currently have) without conflicts.
 
Look up the manual for the Dlink router and find out how to turn off DHCP or to turn on some kind of wireless access point mode so it doesn't work as a full router... you can't have 2 DHCP servers on the same network segment (which is what you currently have) without conflicts.
Update,
Thanks alot,
I have turned off dhcp from router, testing from 3 days, it seems like it have been fixed now..
Thanks to all people, helped alot..
 
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