Solved IP Changing Disconnect my connection

[lkurrt]

I have a question. Why does my laptop disconnect me whenever I am trying to change my IPv4 address? And also about the DNS Settings.

 

[theveterans]

I'm not very familiar with networking. Someone correct me if I'm wrong.

From what I understand, I think you want your computer to set a static IP probably for port forwarding purposes. The problem is that the computer usually gets its IP address from the DHCP server (e.g. the router) and the computer is configured to get a static IP but the DHCP is giving a different IP lease for your computer. That's probably why you lose connectivity.

The best way is to assign a static IP for your computer through the router's firmware. This way your computer will always get that IP you set on the router and you won't need to change any settings from Windows. See the screenshot below:

 

[YannikRoth]

I think it's because the IP your assigning to yourself is already in use. What router are you using, or are you using a DHCP Server?
On Cisco routers you can reserve an IP Address so it doesn't get assigned to anyone and then you can manually assign it to yourself. The other option is, if you are using a DHCP server, that you tell it to assign a certain IP only to you. This is done by looking the source MAC-Address in the DHCP-Request packet. Even though you don't have a static IP, you will always get the same IP. This is very comfortable if your Laptop/PC often changes between networks, otherwise you always need to assign a static IP to yourself.
Hope this helps

 

[lkurrt]

I'm not very familiar with networking. Someone correct me if I'm wrong.

From what I understand, I think you want your computer to set a static IP probably for port forwarding purposes. The problem is that the computer usually gets its IP address from the DHCP server (e.g. the router) and the computer is configured to get a static IP but the DHCP is giving a different IP lease for your computer. That's probably why you lose connectivity.

The best way is to assign a static IP for your computer through the router's firmware. This way your computer will always get that IP you set on the router and you won't need to change any settings from Windows. See the screenshot below:

View attachment 302819

We are using a BUffalo router, I dont know what the model is.

 

[chev65]

I have a question. Why does my laptop disconnect me whenever I am trying to change my IPv4 address? And also about the DNS Settings.

This isn't something you can just guess at.

The IP you are using isn't even in the correct subnet to work with this router.

You need to use an IP that is in the same subnet "third octet needs to be the same as the router is using" so use 192.168.2.xxx" and also you need to use an IP that isn't in the range of DHCP. So if DHCP is from 192.168.1.2/199 you need to use an IP higher than .199 like .200

The DNS servers also need to be valid, you can use the router for DNS or type in valid DNS IP address's like Google at 8.8.8.8 and 8.8.4.4

 

[Slartybart]

Basically you're moving. Just as the Post Office has to stop mail to the old address and start mail to the new address

Changing IP addresses requires a disconnect and reconnect with your new address.

 

[lkurrt]

Basically you're moving. Just as the Post Office has to stop mail to the old address and start mail to the new address

Changing IP addresses requires a disconnect and reconnect with your new address.

So lets say I change the Ipv4 from .36 to .xx I need to disconnect first right? Sorry guys Im noob.

 

[Slartybart]

First you have to know how the router is configured.

It's normally setup with a subnet of 0 or 1 in home networks.
192.168.0.xx or 192.168.1.xx

Let's start with
Has this ever worked?
Why do you want to change the IP address?

 

[lkurrt]

First you have to know how the router is configured.

It's normally setup with a subnet of 0 or 1 in home networks.
192.168.0.xx or 192.168.1.xx

Let's start with
Has this ever worked?
Why do you want to change the IP address?

Its 192.168.1.xx that's the configuration. I did try changing the .xx to .36. I'm connected to the router but I don't have an internet connection. I want to change it because someone is spoofing with my Ip address here in the office

 

[chev65]

It requires more than just a disconnect and reconnect. An incorrect static IP of 192.168.16.2 was typed into the static IP settings. This IP is in the wrong subnet to work with this network, you only want to change the last octet.

You would be far better served using the DHCP reservation for this as it's better to just use a reservation from a known working IP address.

For a static IP to work it is required that you use an IP that is outside the range of DHCP or you could end up using an IP that is already in use or will be assigned to another machine later which won't work.

It's very simple, just follow directions which have already been posted.

 

[lkurrt]

OK ill see , I'll try it.

 

[lkurrt]

It requires more than just a disconnect and reconnect. An incorrect static IP of 192.168.16.2 was typed into the static IP settings. This IP is in the wrong subnet to work with this network, you only want to change the last octet.

You would be far better served using the DHCP reservation for this as it's better to just use a reservation from a known working IP address.

For a static IP to work it is required that you use an IP that is outside the range of DHCP or you could end up using an IP that is already in use or will be assigned to another machine later which won't work.

It's very simple, just follow directions which have already been posted.

I did try changing it to 192.168.1.xx digits. I'm connected to the router but I cant access the internet.

 

[Slartybart]

Could you explain what is happening that causes you to believe someone is spoofing your address?

If someone is spoofing your address at the office, you need to resolve that with your IT department. Changing the IP address won't prevent someone from messing around, if that's the case.

I'm going to guess that spoofing isn't really what is happening, but I don't know the situation. It might be error msgs about IP address conflicts.

Post a screen shot of what happens - why you think it's spoofing. Again, if it is spoofing, talk to your IT person or network admin. Spoofing is not something that should take place in a work environment.

Thanks

 

[chev65]

It requires more than just a disconnect and reconnect. An incorrect static IP of 192.168.16.2 was typed into the static IP settings. This IP is in the wrong subnet to work with this network, you only want to change the last octet.

You would be far better served using the DHCP reservation for this as it's better to just use a reservation from a known working IP address.

For a static IP to work it is required that you use an IP that is outside the range of DHCP or you could end up using an IP that is already in use or will be assigned to another machine later which won't work.

It's very simple, just follow directions which have already been posted.

I did try changing it to 192.168.1.xx digits. I'm connected to the router but I cant access the internet.

Well actually your router uses a default gateway of 192.168.2.1 therefore the static IP needs to look something like 192.168.2.xx not 1.xx

Use DHCP reservation if you are having problems with the static IP settings. It makes no difference either way and it's much easier to set up because you do not need to worry about using an IP that is outside the DHCP range.

 

[Britton30]

Ikurrt, you are not entering "xx" as the octet, are you? "xx" means an unknown number.

 

[lkurrt]

Ikurrt, you are not entering "xx" as the octet, are you? "xx" means an unknown number.

Yes as unknown number.

 

[lkurrt]

It requires more than just a disconnect and reconnect. An incorrect static IP of 192.168.16.2 was typed into the static IP settings. This IP is in the wrong subnet to work with this network, you only want to change the last octet.

You would be far better served using the DHCP reservation for this as it's better to just use a reservation from a known working IP address.

For a static IP to work it is required that you use an IP that is outside the range of DHCP or you could end up using an IP that is already in use or will be assigned to another machine later which won't work.

It's very simple, just follow directions which have already been posted.

I did try changing it to 192.168.1.xx digits. I'm connected to the router but I cant access the internet.

Well actually your router uses a default gateway of 192.168.2.1 therefore the static IP needs to look something like 192.168.2.xx not 1.xx

Use DHCP reservation if you are having problems with the static IP settings. It makes no difference either way and it's much easier to set up because you do not need to worry about using an IP that is outside the DHCP range.

So im gonna try setting it too 192.168.2.xx


You mean this?

 

[chev65]

Ikurrt, you are not entering "xx" as the octet, are you? "xx" means an unknown number.

Yes as unknown number.

Which is why I mentioned using DHCP reservation.

If you don't know what your doing this is much easier and saves me hours of trying to explain how IP addresses work.

.XX is just an example, you would need to use an actual number where .XX is. This number also needs to be outside the DHCP range so it won't be repeated.

This entire thing is really blown way out of proportion now, this is very simple.

 

[lkurrt]

Could you explain what is happening that causes you to believe someone is spoofing your address?

If someone is spoofing your address at the office, you need to resolve that with your IT department. Changing the IP address won't prevent someone from messing around, if that's the case.

I'm going to guess that spoofing isn't really what is happening, but I don't know the situation. It might be error msgs about IP address conflicts.

Post a screen shot of what happens - why you think it's spoofing. Again, if it is spoofing, talk to your IT person or network admin. Spoofing is not something that should take place in a work environment.

Thanks

Spoofing , re routing websites, turning the images upside down blurring the images etc.. Things like that.

 

[Slartybart]

Good catch Britton30.

Maybe this will help everyone.

Set your IP config to "Obtain automatically" for the IP address and DNS servers

connect and post an ipconfig - all