network help

hi
i am a newbee in here and so kindly consider the amaturity
issues. i get my net connection from a LAN connection. My network provider gave each of us an IP address. But what i found was i could use the other IP's on the LAN on my connetion and access the net beyond my addressed time.This is so simple that anyone in the network who has seen the flaw can reap an advantage. But the real question is doesn't the service provider know the physical IP address by simply sending a ARP request. Is it that simple as im thinking or is there something complex that i didn't understand .Please help me.

thank you

I'm not entirely sure what you're asking. The computer (or router) connected to the Internet should have an IP address automatically assigned from your ISP. Then, computers on your network should have internal addresses (such as 192.168.0.x or 10.0.0.x). If you've been told to get your external IP address automatically from your ISP, then you shouldn't really change it to what you want.

its not that i assigned a new external IP, i have just assigned an internal IP of the LAN

from a PM:



You can change the IP addresses of the computers within your network without any problems. Just make sure that each computer has a unique address.



I'm not sure what you're talking about. The ISP will only see the one external interface on your router, and won't be able to see the individual computers.



Do you have any firewalls enabled?

i have Zone Labs PRo firewall . I have noticed significant changes by using this firewall
like unable to open PDF files etc but how could it effect ping.

i tried pinging without using the firewall but still it wont work (request times out)

you've no need to keep PMing me. Just respond back to the thread and I'll help.

Well double check that you've disabled the firewalls. Also make sure that the built-in Internet Connection Firewall is not enabled. If this doesn't work, print out the ipconfig for each computer (see the sticky for details about this).

well i tried disabling both the fire walls but still with no luck. i just wanted to ask how will the LAN operator know about our physical IP and the conflicts between physical and soft IP's

dhcp is not enabled on my LAN. but even then doesn't the operator know of the soft ID's

i will send u my ipconfig/all, perhaps this will help

Windows IP Configuration
Host Name . . . . . . . . . . . . : san-7f4uqw98lrp
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Winbond PCI Fast Ethernet Adapter (Generic W89C840)
Physical Address. . . . . . . . . : 00-80-48-B5-27-79
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.20.20.3
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 10.20.20.2
DNS Servers . . . . . . . . . . . : 10.20.20.2, 10.20.20.1

So Godfather you start by asking a question about your ability to use a different assigned ip address then the one you normally use out of the three and now you have a access problem and can't ping???

What happened?

First off a firewall, either software like ZoneAlarm or hardware like in a router accomplish the same thing. They hide your ip address [and the station its attached to] by not returning pings [icmp traffic - icmp is part of the ip protocol stack]. It will also allow you to configure what ip address ranges you allow to access or deny on your workstation.

I take it from your ip address that you are not on your own private network but are bridged to the ISP. Your local network is just an extension of the isp's network. This is why your wkstation ip range is the same as the ISP's DNS servers.

If when you mean you can use other ips in the ISP range to get around time limit restriction it just means your ISP isn't doing proper security/ip management. They will catch on eventually.

There are no hard and soft ips or ids. A tcp/ip address is associated [bind] to a piece of hardware [nic] which has a MAC [40bit ethernet address]. Yes your isp should be able to see and lockdown what ip address is associated with what mac address. Apparently they are not and are on the honor system.

but when we can manually configure the IP address in the allowed range then what will help the ISP to identify the NIC and MAC address

but dhcp is not enabled and so i think i can manually assign IP, but will it prevent the ISP from not knowing my MAC address

the switch that you are connected to will have an ARP table as well a MAC address table, when viewing these two tables the isp can see the mac associated to an IP which is associated to a port. matching your MAC and IP they will see your IP change and MAC stay the same. they prolly wont notice until you use an IP address that conflicts with someone else. The switch has to know your MAC address as this is how it sends data to your computer. changing your IP (layer3) address has nothing to do with your mac (layer2). You can spoof your mac (special software can do this) but they will still see what port is accessing the internet.

but what if there are more than one machines accessing the same port for the service which normally happens