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[Q] Tethering working with 3g but not with wifi

Hello,
I am using gueste rom with spica kernel, but I think it is independent of rom/kernel.
When I have internet on 3G on my o2x, I connect it to my laptop and use usbtethering. It works.
When I have internet on wifi on my o2x, I do the same thing but I don't have internet on my laptop.
Wireshark shows that my laptop send packet through my phone and I can ping my phone. But I can't ping website. However dns works (I can see dns packet). On my phone, internet works well.
I don't really know how does tethering work. Maybe it uses iptables/nat ? How can I have working tethering? Thank you.

What WiFi device is your phone connected to and why can't your laptop just connect direct to that? (I'm assuming the laptop has wifi). It's also possible to set your phone up as a WiFi Access Point, that would allow you to connect your laptop wirelessly. As I understand, however, if you use your phone as an Access Point, it won't be able to connect to the internet via WiFi - eg, you could be in field with good 3G, connect your laptop via WiFi to the phone and then surf via WiFi and out via the phone's 3G signal.
The author of Gueste does warn about using spica's "performance packs" for stability issues.

RadioCharlie said:
What WiFi device is your phone connected to
Click to expand...
Click to collapse
It is a public wifi emitted by a router. It is possible that the router blocks tethering?
and why can't your laptop just connect direct to that? (I'm assuming the laptop has wifi).
Click to expand...
Click to collapse
I could, the reason is that my wifi signal is weak but at my door. It is just more convenient that my phone is near my door and connected to my laptop. Moreover, I'm studying networks and this issue arouses my curiosity
It's also possible to set your phone up as a WiFi Access Point, that would allow you to connect your laptop wirelessly. As I understand, however, if you use your phone as an Access Point, it won't be able to connect to the internet via WiFi - eg, you could be in field with good 3G, connect your laptop via WiFi to the phone and then surf via WiFi and out via the phone's 3G signal.
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Click to collapse
I know, the wifi hotspot works.

Chromecast broadcasting ad-hoc connection after setup?

Hey guys,
Can anyone confirm that the Chromecast is broadcasting its ad-hoc connection after setup?
I was wondering about this since it displays itself and could it be prone to hacking?
i.imgur.com/kuagYqS.png

Wouldn't that require two wifi adapters? One to connect to your local wifi network and one to create an ad-hoc network. In a $35 device? Hmmm.

tau31 said:
Hey guys,
Can anyone confirm that the Chromecast is broadcasting its ad-hoc connection after setup?
I was wondering about this since it displays itself and could it be prone to hacking?
i.imgur.com/kuagYqS.png
Click to expand...
Click to collapse
For me, the unit only broadcasts when in setup mode (first use), or when it is unable to connect to the last good network. When its connected and in use though, it does not broadcast!

ddggttff3 said:
For me, the unit only broadcasts when in setup mode (first use), or when it is unable to connect to the last good network. When its connected and in use though, it does not broadcast!
Click to expand...
Click to collapse
I restored factory settings and redid it and it does not show now, maybe it has something to do with me hiding my SSID to my router, it some how gets in a loop and just broadcasts even though I could cast.

Setting up chromecast without WiFi

So I'm in the army right now, which means there's a TV but no WiFi available.
I did think of just setting up a Hotspot with another phone but it gets pretty annoying having to have 2 people at all time.
So I went digging in the Internet and found someone at a random forum (can't find it now for credit..), that said that If you set up the Hotspot in your own phone and configure it with another one you don't need the other one around anymore - being the Hotspot works as being connected to it.
Now I'm pretty sure there shouldn't be any reason I couldn't set it up on my own phone (the hotspot), except the Google home app just demands I connect to the WiFi network, which I can't do because you can't connect to yourself sadly.
I think if someone made some changes to the Google home app, or made an alternative set up app it could work. I have no idea how to code an app, so I came here ?
tl:dr I Want an app that does the same as the home app for setting chromecast up, but without checking if I'm connected to a WiFi network. (I think)

I'm guessing that you have no WiFi but you do have a hard line internet connection?
The only issue with what I'm going to suggest is that base rules may prohibit creating a WiFi access point on any of their hardline connections.
But the best solution for you is to buy a Portable Router (see posts here about using CCast in a Hotel).
It's a small box about the size of a DC transformer that plugs into the outlet and also any Network to create a small footprint WiFi access point.
I suggest looking for a model that also has Repeater mode that allows it to connect to another WiFi access point to create your own private network as opposed to a hard line.
It is probably the best way to use a CCast in places where WiFi is not available without having to play with Phone Hotspot which doesn't always work due to the fact the hotspot can't control the CCast in that mode.
The other Option that is most likely to be allowed is to add a WiFi puck to your Mobile account. Then there would be no potential compromising of the Military network (which is why they might not allow the Portable Router to be used) and you would no longer need two phones to run the CCast.
CCast definitely needs Internet so that Puck might be the safest and best way forward for you.
As for what you read...The issue is that if the Phone goes out of range it stops working.

Asphyx said:
I'm guessing that you have no WiFi but you do have a hard line internet connection?
The only issue with what I'm going to suggest is that base rules may prohibit creating a WiFi access point on any of their hardline connections.
But the best solution for you is to buy a Portable Router (see posts here about using CCast in a Hotel).
It's a small box about the size of a DC transformer that plugs into the outlet and also any Network to create a small footprint WiFi access point.
I suggest looking for a model that also has Repeater mode that allows it to connect to another WiFi access point to create your own private network as opposed to a hard line.
It is probably the best way to use a CCast in places where WiFi is not available without having to play with Phone Hotspot which doesn't always work due to the fact the hotspot can't control the CCast in that mode.
The other Option that is most likely to be allowed is to add a WiFi puck to your Mobile account. Then there would be no potential compromising of the Military network (which is why they might not allow the Portable Router to be used) and you would no longer need two phones to run the CCast.
CCast definitely needs Internet so that Puck might be the safest and best way forward for you.
As for what you read...The issue is that if the Phone goes out of range it stops working.
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Click to collapse
Actually, no Internet at all, just mobile data, but since I got 15 gigs it's OK for me to use it.

exeLz said:
Actually, no Internet at all, just mobile data, but since I got 15 gigs it's OK for me to use it.
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Click to collapse
Then I suggest getting the WiFi puck and adding it to your data account.

Asphyx said:
Then I suggest getting the WiFi puck and adding it to your data account.
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Click to collapse
To be honest, it is a good idea but my I was mainly wondering if I could solve it via software which is both easier obviously and also I just wanted to know if it's actually possible since I thought of it and I wanna know if I got it right

exeLz said:
To be honest, it is a good idea but my I was mainly wondering if I could solve it via software which is both easier obviously and also I just wanted to know if it's actually possible since I thought of it and I wanna know if I got it right
Click to expand...
Click to collapse
Not really...All the hacks and such that people try simply don't work well due to the fact that the Phone can't really connect to the same subnet as the Hotspot. When you go into Hotspot mode you can't also connect to that hotspot internally because WiFi is no longer available to the phone.

Asphyx said:
Not really...All the hacks and such that people try simply don't work well due to the fact that the Phone can't really connect to the same subnet as the Hotspot. When you go into Hotspot mode you can't also connect to that hotspot internally because WiFi is no longer available to the phone.
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Click to collapse
That's why i suggested tempering with the app so it treats being a Hotspot as if u were with WiFi on connected to one.
Basically take off the check for being connected to WiFi.

exeLz said:
That's why i suggested tempering with the app so it treats being a Hotspot as if u were with WiFi on connected to one.
Basically take off the check for being connected to WiFi.
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Click to collapse
The issue isn't the app...It's the fact that the WiFi in your phone can only do one thing at a time....BE an Access Point or CONNECT to an access point.
It can't connect to itself as the radio can't do both things at once.
So when you go into hotspot there is no way to get on the same subnet as the hotspot with the phone.
Because there is no network adapter available to connect to it. It is too busy being an access point.
Basically going into hotspot turns the Phone into a router. A router the phone has no way to connect to. So you either need another device to connect to that phone router or find some other router with internet.
Which is what the Cellular Puck will give you.

Asphyx said:
The issue isn't the app...It's the fact that the WiFi in your phone can only do one thing at a time....BE an Access Point or CONNECT to an access point.
It can't connect to itself as the radio can't do both things at once.
So when you go into hotspot there is no way to get on the same subnet as the hotspot with the phone.
Because there is no network adapter available to connect to it. It is too busy being an access point.
Basically going into hotspot turns the Phone into a router. A router the phone has no way to connect to. So you either need another device to connect to that phone router or find some other router with internet.
Which is what the Cellular Puck will give you.
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Click to collapse
Like I said, once the setup is done, being the Hotspot is just like being connected to is. The app still doesn't recognize you're connected but if you're on the web the chromecast icon does pop up when needed, all the third party apps do recognize you as being connected.

All you managed to do with Google Home (which can't be edited by anyone but Google)on the second phone is connect your CCast to the Phone Hotspot for it's Internet. There is no way to avoid that setup....HOWEVER...
As long as you don't set it up to connect to some other Hotspot there is no need to run Home again, Just turn on Hotspot and it should reconnect.
It will even remember the password,

Accidental post

Asphyx said:
All you managed to do with Google Home (which can't be edited by anyone but Google)on the second phone is connect your CCast to the Phone Hotspot for it's Internet. There is no way to avoid that setup....HOWEVER...
As long as you don't set it up to connect to some other Hotspot there is no need to run Home again, Just turn on Hotspot and it should reconnect.
It will even remember the password,
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Yea I know, but sometimes friends take it or something and it's a pain in the ass to explain everything, and even when I do it means I gotta reconnect at my end again which is annoying just thought someone could maybe find a solution that sounded really simple for me, guess not, too bad..
Thanks anyway!

Well trying to recode Home is a dead end....Android wouldn't even let you install it!
You guys should just chip in and buy the puck.
It will even let you use Tablets and Laptops as well as simplify the CCast use.

I know this is an older post; not sure if you are still interested. I read all the replies and not sure what to make of it as far as if anyone had a working solution or not. No disrespect to anyone, but I couldn't tell for sure so I'm posting a link to my solution which does work. The two important steps are included. One is using " other wifi" in the drop down list when searching for your hotspot. The second is enabling GUEST MODE.
https://forum.xda-developers.com/android/help/how-to-cast-screen-android-phone-to-t4032653

I’m trying something similar with a Chromecast 3rd gen and iPhone 5S (iOS 12). Main issue seems to be guest mode doesn’t work at all on any apps, and pretty much every solution i’ve seen to this results in guest mode being used for the eventual casting. If you have android or iOS 13 then ymmv.
The only solution i’ve found are workarounds, the obvious being
1) don’t buy a chromecast (it’s not much of a solution but hey it’s $30).
2) use a secondary device to cast.
3) use a tethered travel router, and this can be done with only a phone and mobile data for internet, but there’s a catch:
First i’d Recommend any router by GLi.net (cheapest “mango” router is about $20) as they support iOS and android and both WiFi and usb tethering.
Also, i’ve Tried using a WiFi hotspot on the phone, and it’s the same issue - no connection to the chromecast regardless of how. However... iPhones will allow you to create a hotspot using *only* cables usb tethering, so if you set the router up to *only* accept internet via cables tether (turn off WiFi/repeater tethering), then you can have both the chromecast and iPhone connect to the routers WiFi, whilst providing net access to the router (and WiFi network) from the same iphone’s mobile data via usb. Simple howoto:
Important: Turn OFF WiFi on the phone, and turn off hotspot.
Connect phone to router via usb, accept trust settings.
Turn on personal hotspot, you’ll get a message asking whether to use WiFi or just usb (andbluetooth if it’s also turned on). Select just usb/Bluetooth.
Wait until blue connection bar shows on phone (if not, make sure routers setup properly to gain net via usb tethering).
Now, turn on WiFi on the phone, and connect to routers WiFi.
Setup chromecast as normal, selecting to connect to routers WiFi too.
Note turning hotspot off and on again whilst WiFi is running will start a hotspot on WiFi and disconnect you from router WiFi, so you’ll always have to go through process of turning WiFi off, turn hotspot on, turn WiFi on.
So you can do this with the right router and a usb connection to phone. Or maybe android and working guest mode. Otheriwse, ...fire tv anyone?

WiFi turns off when hotspot turn on

My P10 VTR-L29 starts giving problem from today. When I turn on WiFi hotspot to share my WiFi (not the Data internet) internet to my smart tv, the Wi-Fi connection get disconnected from the router.
I have tried with the Network resetting but problem still exist. Does anyone have the solution for this.
Thank you in advance.

Ronju Khan said:
My P10 VTR-L29 starts giving problem from today. When I turn on WiFi hotspot to share my WiFi (not the Data internet) internet to my smart tv, the Wi-Fi connection get disconnected from the router.
I have tried with the Network resetting but problem still exist. Does anyone have the solution for this.
Thank you in advance.
Click to expand...
Click to collapse
you cant have both wifi and hotspot on.

Ronju Khan said:
My P10 VTR-L29 starts giving problem from today. When I turn on WiFi hotspot to share my WiFi (not the Data internet) internet to my smart tv, the Wi-Fi connection get disconnected from the router.
I have tried with the Network resetting but problem still exist. Does anyone have the solution for this.
Thank you in advance.
Click to expand...
Click to collapse
It's not an issue, it works like that... You cannot have both activated at the same time...

Ronju Khan said:
My P10 VTR-L29 starts giving problem from today. When I turn on WiFi hotspot to share my WiFi (not the Data internet) internet to my smart tv, the Wi-Fi connection get disconnected from the router.
I have tried with the Network resetting but problem still exist. Does anyone have the solution for this.
Thank you in advance.
Click to expand...
Click to collapse
Just one question.
If you have smart TV, and TV have WiFi module, why do you need to "share" WiFi to connect TV to network?
Connect it directly to main WiFi network

Good question.
My TV Samsung 48 inches Model UA48H6400 started giving problem like the WiFi connection drops while Netflix moving on playing. The Netflix get stuck at 25%. I can see the Internet WiFi connection lost from TV. Turning off the TV WiFi gets back and Netflix will run for about 30 minutes and then again WiFi connection drops. I have tried changing IP settings to DNS manual and set to 8.8.8.8 or 8.8.4.4 but the problem exists.
So I did turning off TV WiFi connection from router and connect TV with phones WiFi tethering. So I enjoyed Netflix for 2 days with no Internet problem.
Then the phone WiFi tethering started drops when I turn on phones WiFi hotspot tethering and so far no solution found in YouTube or any other source.
I got another interim solution which is I turn on my phones Bluetooth tethering with WiFi Bluetooth bridge. So Netflix is running no problem so far but don't know when this process will be corrupted.
Hope I have explained the situation.
Thank you

nocio said:
Just one question.
If you have smart TV, and TV have WiFi module, why do you need to "share" WiFi to connect TV to network?
Connect it directly to main WiFi network
Click to expand...
Click to collapse
Good question.
My TV Samsung 48 inches Model UA48H6400 started giving problem like the WiFi connection drops while Netflix moving on playing. The Netflix get stuck at 25%. I can see the Internet WiFi connection lost from TV. Turning off the TV WiFi gets back and Netflix will run for about 30 minutes and then again WiFi connection drops. I have tried changing IP settings to DNS manual and set to 8.8.8.8 or 8.8.4.4 but the problem exists.
So I did turning off TV WiFi connection from router and connect TV with phones WiFi tethering. So I enjoyed Netflix for 2 days with no Internet problem.
Then the phone WiFi tethering started drops when I turn on phones WiFi hotspot tethering and so far no solution found in YouTube or any other source.
I got another interim solution which is I turn on my phones Bluetooth tethering with WiFi Bluetooth bridge. So Netflix is running no problem so far but don't know when this process will be corrupted.
Hope I have explained the situation.
Thank you

Question Connect Phone to his own tethered network

Hi !
I have a S21 Ultra, and use it as a modem for my house with wifi tethering.
I can access my printer with my computer on this wifi network
But here is the problem : I can't access the device on this network from my phone.
I can't print from my phone,
I can't use app mirroring on Windows (open samsung flagship apps on W10 computer) because both S21 and computer have to be on the same wifi network.
Is there any way to make the phone part of his own wifi tethering ? Or workaround ?
Thanks !

no what your trying to do is hack someones phone....its not gonna happen!!!!

HELLFISH420 said:
no what your trying to do is hack someones phone....its not gonna happen!!!!
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Click to collapse
Don't understand your message... It's my own phone that doesn't detect itself in the wifi network list. I have no problem to connect network from one phone onto another. It is on the same phone, both emitter and receiver

Yttrium39 said:
Hi !
I have a S21 Ultra, and use it as a modem for my house with wifi tethering.
I can access my printer with my computer on this wifi network
But here is the problem : I can't access the device on this network from my phone.
I can't print from my phone,
I can't use app mirroring on Windows (open samsung flagship apps on W10 computer) because both S21 and computer have to be on the same wifi network.
Is there any way to make the phone part of his own wifi tethering ? Or workaround ?
Thanks !
Click to expand...
Click to collapse
I think you can try to make a hotspot on the PC and share wifi (from the phone) to the PC hotspot and connect the printer itself to the PC hotspot

Tethering is like connecting a modem to a device. Hotspot is creating a local wifi network for devices to connect to.
Tethering vs Hotspot: Difference and Comparison
Tethering allows a device to share its internet connection with other devices via a physical connection (such as USB), while a hotspot creates a Wi-Fi network to share the device's internet connection wirelessly.
askanydifference.com
Based on your description you are creating a hotspot on the phone that the laptop and printer connect to? If so then the phone cannot "join" that network as the wifi stack in the phone is being used to run a network and the phone has access to the mobile data network the wifi is representing.

No, only the computer connects to the phone.
but create a second hotspot on the computer that connects the printer to the computer

Yttrium39 said:
Hi !
I have a S21 Ultra, and use it as a modem for my house with wifi tethering.
I can access my printer with my computer on this wifi network
But here is the problem : I can't access the device on this network from my phone.
I can't print from my phone,
I can't use app mirroring on Windows (open samsung flagship apps on W10 computer) because both S21 and computer have to be on the same wifi network.
Is there any way to make the phone part of his own wifi tethering ? Or workaround ?
Thanks !
Click to expand...
Click to collapse
Your phone wifi module can either act as a broadcaster or receiver at a time, but not both. It will only handle one wifi network at a time, either the one it's broadcasting (endogenous mobile hotspot) or the one it's receiving (exogenous WiFi)
You can see this as a prompt when you turn on mobile hotspot. Whenever you turn on Wifi Hotspot, your WiFi will automatically get turned off. It will even display a notification and ask for your consent (at least mine does)

enigmaamit said:
Your phone wifi module can either act as a broadcaster or receiver at a time, but not both. It will only handle one wifi network at a time, either the one it's broadcasting (endogenous mobile hotspot) or the one it's receiving (exogenous WiFi)
You can see this as a prompt when you turn on mobile hotspot. Whenever you turn on Wifi Hotspot, your WiFi will automatically get turned off. It will even display a notification and ask for your consent (at least mine does)
Click to expand...
Click to collapse
I just checked and it is possible to share wifi to wifi from my G991B

Kuba1996 said:
I just checked and it is possible to share wifi to wifi from my G991B
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Click to collapse
Wow! That's nice to hear. Haven't used that feature on a phone before. Didn't know it was doable. Well, I guess you learn something new everyday.

thats what hackers and LEA use.....smh