Why public IP address changed for home computer depending on which ethernet port is used on motherboard ?

The question is now what happens if I connect a different computer, say a laptop would it change again ? I don't think so it would probably use 84.25.113.203 again, but laptop's ethernet mac is totally different I presume.

Just hypothesis will have to test laptop and pay attention to this to notice any changes.

Other idea which came to mind is "device spying" by ISP.

Otherwise I have no explanation for this for now...

I may report my findings for laptop later...

Bye, Skybuck.

ipconfig /all on german laptop:

Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. Alle Rechte vorbehalten.

C:\Users\Hartmanns>ipconfig /all

Windows-IP-Konfiguration

Hostname . . . . . . . . . . . . : xxxxxxxxxx-NB

Knotentyp . . . . . . . . . . . . : Gemischt IP-Routing aktiviert . . . . . . : Ja WINS-Proxy aktiviert . . . . . . : Nein DNS-Suffixsuchliste . . . . . . . : dynamic.ziggo.nl

Drahtlos-LAN-Adapter Drahtlosnetzwerkverbindung:

Medienstatus. . . . . . . . . . . : Medium getrennt Verbindungsspezifisches DNS-Suffix: schunck.nl Beschreibung. . . . . . . . . . . : Ralink RT3090 802.11b/g/n WiFi Adapt er Physikalische Adresse . . . . . . : E0-2A-82-15-63-03 DHCP aktiviert. . . . . . . . . . : Ja Autokonfiguration aktiviert . . . : Ja

Ethernet-Adapter LAN-Verbindung:

Verbindungsspezifisches DNS-Suffix: dynamic.ziggo.nl Beschreibung. . . . . . . . . . . : Realtek PCIe GBE Family Controller Physikalische Adresse . . . . . . : 64-31-50-01-BD-47 DHCP aktiviert. . . . . . . . . . : Ja Autokonfiguration aktiviert . . . : Ja Verbindungslokale IPv6-Adresse . : fe80::a95c:c1ce:5f6f:166e%10(Bevorzu gt) IPv4-Adresse . . . . . . . . . . : 80.115.146.7(Bevorzugt) Subnetzmaske . . . . . . . . . . : 255.255.254.0 Lease erhalten. . . . . . . . . . : dinsdag 16 oktober 2018 9:18:36

6 Standardgateway . . . . . . . . . : 80.115.146.1 DHCP-Server . . . . . . . . . . . : 10.255.235.1 DHCPv6-IAID . . . . . . . . . . . : 174338384 DHCPv6-Client-DUID. . . . . . . . : 00-01-00-01-14-49-76-F6-64-31-50-01- BD-47

DNS-Server . . . . . . . . . . . : 84.116.46.22 84.116.46.23

Tunneladapter isatap.schunck.nl:

Medienstatus. . . . . . . . . . . : Medium getrennt Verbindungsspezifisches DNS-Suffix: Beschreibung. . . . . . . . . . . : Microsoft-ISATAP-Adapter Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0 DHCP aktiviert. . . . . . . . . . : Nein Autokonfiguration aktiviert . . . : Ja

Tunneladapter isatap.dynamic.ziggo.nl:

Medienstatus. . . . . . . . . . . : Medium getrennt Verbindungsspezifisches DNS-Suffix: dynamic.ziggo.nl Beschreibung. . . . . . . . . . . : Microsoft-ISATAP-Adapter #2 Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0 DHCP aktiviert. . . . . . . . . . : Nein Autokonfiguration aktiviert . . . : Ja

Tunneladapter Teredo Tunneling Pseudo-Interface:

Medienstatus. . . . . . . . . . . : Medium getrennt Verbindungsspezifisches DNS-Suffix: Beschreibung. . . . . . . . . . . : Teredo Tunneling Pseudo-Interface Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0 DHCP aktiviert. . . . . . . . . . : Nein Autokonfiguration aktiviert . . . : Ja

Tunneladapter 6TO4 Adapter:

Verbindungsspezifisches DNS-Suffix: dynamic.ziggo.nl Beschreibung. . . . . . . . . . . : Microsoft-6zu4-Adapter #3 Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0 DHCP aktiviert. . . . . . . . . . : Nein Autokonfiguration aktiviert . . . : Ja IPv6-Adresse. . . . . . . . . . . : 2002:5073:9207::5073:9207(Bevorzugt) Standardgateway . . . . . . . . . : 2002:c058:6301::c058:6301 2002:c058:6301::1 DNS-Server . . . . . . . . . . . : 84.116.46.22 84.116.46.23

Interestingly enough this laptop remembers wifi hotspot bit of a privacy th ing there but ok/

Also IP is definetly different... didnt quit expect that but then again kin da did... this makes a little bit more sense to me but not much.

Think laptop mac address has something to do with giving it a specific publ ic ip.

Bye, Skybuck

Getting different IP addresses when you change ethernet ports is exactly what you should be expecting.

The service provider is not being "kind" by allocating you two addresses. You only get one at a time.

Your MAC address is sent to the service provider's DHCP server at

10.255.235.1 which then allocates you an address and default gateway. You can follow this process using Wireshark if you want.

The DHCP server remembers your MAC address and if it sees that you have recently been connected using the same MAC address it tries to allocate you the IP address that you had before.

Every MAC address that you use will result in a different IP address. However, if you try to connect two computers at once only one of them is likely to get a working connection.

If you don't use a particular MAC address for a while, the DHCP server will eventually time out and return the address associated with that MAC to a shared pool from which it will get allocated to somebody else.

The reason you are getting this behaviour is because you are using the cable modem in bridge mode and connecting directly to it. Most people do not do this!

The usual setups are:

1) Use cable modem in "router" mode. The router then allocates you a private address, usually something like 192.168.x.x In this mode you can have many computers on your LAN all accessing the internet at the same time sharing the same IP address using NAT in the router. If you need to allow incoming access on certain ports you set up port forwarding rules in the router configuration web pages. Some routers will set up incoming port forwards automatically at the request of the PC using the PnP protocol. Alternatively, you configure a "DMZ" where one of your computers receives all incoming traffic that is not a reply to outgoing traffic.

2) Use cable modem in "bridge" mode and connect your own separate router between the cable modem and the rest of the LAN. Port forwarding or "DMZ" would be set up as described above but in the separate router. The advantage of a separate router is that you have a wider choice of products.

In both of the above setups your LAN is protected by firewall rules in the router (or router part of the cable modem).

In your current setup, you are relying totally on your PC being immune to hacking attempts from outside, especially if you have disabled the Windows firewall.

You seem to be making life much more complicated for yourself than you need to. I suspect that your Windows setup is broken in some way. I can't help much with that as I hardly ever use Windows. (I prefer Linux Mint for desktops and Centos for servers.)

John

snipped-for-privacy@hotmail.com wrote in news:592d5aa3-65c1-4f89-9712-7e15f292dfc1 @googlegroups.com:

Idiot. Your "public IP" address is assigned by the isp. If you hook into THEIR network (your cable modem) with a different MAC ID, they will assign a different public ip address to it. Pretty basic stuff.

Device spying? Grow up. Go learn about tcp/ip AGAIN, cause you missed it the first time through.

snipped-for-privacy@gmail.com wrote in news:e769fb49-503f-4958-a466-ac902849d9b8 @googlegroups.com:

And this is exactly why you should be sending him off to a mewsgroup where his petty stupid shit is on topic. NOT HERE.

He takes stupid to an all new low.