When I type ipconfig in my windows pc I am able to see my Ethernet adapters local area connection IP address for eg : 193.168.1.13 . Now my problem is when I browse the internet I see that My ISP provides different IP addresses for different sessions when I check for my IP. I am not happy with some ip addresses which my ISP provides to me . Is there a way to block my ISP from assigning those IP addresses . Can I write such a rule in firewall so that I can block that range of ip addresses ?
If possible then please tell me how to do that ?
Thanks in advance .
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I have a network like that:
Internet <-> Modem <-> Router (broadcast wifi)
I'm using Windows. If I use command: ipconfig, I only know Modem's IP through info of Default Gateway.
So, how to know the Router's IP in this network.
Thanks.
If you want to know the external (from the Internet IP) you can browse to http://www.whatismyip.com/ and check it there.
Or
You can check it inside the router's configuration page. Unfortunately you can't simply know it by being a member of its network since this is a limitation of the NAT and the IP protocol.
If you wish to know the router's IP inside the internal network of the router .
when running ipconfig it should be the Default Gateway entry.
If you know your IP and you know your Netmask, then you can easy find out the subnet. The Router's IP is "always" the first avaible IP in the subnet. Thats the case for your private IP.
For the public IP you can try a service like this one.
I checked my ip address from http://whatismyipaddress.com/ip-lookup
and I also used 'ipconfig' to check my ip address.
The result are different.
I don't understand why.
Please teach me the reason, thank you!
The IP you see in ipconfig is most likely the IP address your router has assigned to your PC.
The IP address you get from a website is your external IP address, or the IP address that your ISP has assigned to your modem.
I had connect my laptop and phone under a same router/modem.
But the IP addresses that shown on my laptop and phone are different, why???
I'm quite newbie for it, please help me
IP addresses are different inside your network. When you send data outside the network your router uses NAT (Network Address Translation) to assign your Internal(LAN) address your External(WAN) address for the duration of that communication. If they had the same Internal IP address then you would have an error like this http://compnetworking.about.com/od/workingwithipaddresses/f/ip_conflict.htm
Is it possible to have one of our networked PC's to keep using the same IP address (192.168.1.54) so that if the master computer or a failure / shutdown etc happens then the system IP addresses are not reset so i don't have to update all the other pc's hosts files to this PC's new IP address?
You will need to make a reservation based on the MAC address of your network card. You can find this by typing "ipconfig /all" inside the command prompt.
The IP addresses can be reserved on your router or on your server depending on how they are distributed.
You should solve this in the DHCP server (typically in your router), make a reserved IP for the mac-address of the PC in question. Or you configure the PC to not use DHCP but configure a fixed IP. But that should be, if possible, an IP that is not in the DHCP range.
I have 2 machine. One's IP is 169.254.41.172 and the other is 169.254.72.175. They are both connected to the same router. Why is the 'subnet?' different? I'm referring to the 3rd number between 41 and 72.
These are linklocal addresses, they use 255.255.0.0 as subnet mask, so both addresses are in the same subnet.
These addresses are generated automatically, if you want more control over them you will either need a DHCP server, or configure static IP addresses.
Your router is not acting as a DHCP server it seems.
169.254 is a special range usually for Windows machines when they can't obtain an IP address automatically.
From: http://packetlife.net/blog/2008/sep/24/169-254-0-0-addresses-explained/
Occasionally you may encounter a host which has somehow assigned
itself an IP address in the 169.254.0.0/16 range. This is a
particularly common symptom of Windows machines which have been
configured for DHCP but for whatever reason are unable to contact a
DHCP server. When a host fails to dynamically acquire an address, it
can optionally assign itself a link-local IPv4 address in accordance
with RFC 3927. Microsoft's term for this is Automatic Private Internet
Protocol Addressing (APIPA).
These machines are not getting an IP address. The beginning octets of "169.254" identify these addresses as "link-local".
http://en.wikipedia.org/wiki/Link-local_address
For what it's worth, the addresses are not on different subnets as the full link-local definition is 169.254.0.0/16, or a "Class B" subnet. That being said though, there's no way you'll be getting these computers to communicate any time soon. Is the router powered on, are the cables connected and are there uplink lights on the actual RJ45 jacks on both the router and computers? Is DHCP enabled on the router?