aryoba
Premium,MVM
join:2002-08-22
| reply to rolande
With both PPP and static routing
said by rolande  :
They use static routing to the physical interface. The only way you could reuse user A's configuration is if you were physically connected to the same circuit. The ISP controls what traffic routes to where by the routes they add to their network. As a customer, you do not have control of these routes just by adding another user's configuration to your own network.
In a dynamic config scenario, the user authenticates either via PPP or PPPoE or something similar and all of the settings are passed to the client via a control protocol. The ISP's upstream router then dynamically inserts the new route into its routing tables and announces it to the rest of the ISP network using the local routing protocol. In that case, if you knew user A's username and password you could potentially steal their configuration and reuse it on another physical circuit and interface, since it is dynamically configured as a part of authentication.
Some ISPs give out PPP settings to all their static IP customers. Does it mean the ISP router use static routing to physical interface AND authentication? |
|
rolande
Certifiable
Premium,Mod
join:2002-05-24
Powell, OH
clubs:
Host:
Linksys
AT&T Midwest
| reply to aryoba
Re: "Hard coded"
They use static routing to the physical interface. The only way you could reuse user A's configuration is if you were physically connected to the same circuit. The ISP controls what traffic routes to where by the routes they add to their network. As a customer, you do not have control of these routes just by adding another user's configuration to your own network.
In a dynamic config scenario, the user authenticates either via PPP or PPPoE or something similar and all of the settings are passed to the client via a control protocol. The ISP's upstream router then dynamically inserts the new route into its routing tables and announces it to the rest of the ISP network using the local routing protocol. In that case, if you knew user A's username and password you could potentially steal their configuration and reuse it on another physical circuit and interface, since it is dynamically configured as a part of authentication.
--
Remember what they say: "There are 10 types of people in the world.. those who understand binary, and those who don't." |
|
aryoba
Premium,MVM
join:2002-08-22
| reply to rolande
said by rolande :
If there is no authentication occuring then there is no dynamic configuration occuring. All of the user's configuration is hard coded on the ISP's side in this case.
When you said "hard coded"; did it mean that the ISP always check all customer's MAC address before routing their traffic?
Or maybe there is another checking method? |
|
rolande
Certifiable
Premium,Mod
join:2002-05-24
Powell, OH
clubs:
Host:
Linksys
AT&T Midwest
| reply to aryoba
Re: Let's say A is down
If there is no authentication occuring then there is no dynamic configuration occuring. All of the user's configuration is hard coded on the ISP's side in this case, so it is impossible for user B to steal user A's configuration. The ISP's router will not route user B's traffic because it is not configured for user A's settings on user B's interface.
--
Remember what they say: "There are 10 types of people in the world.. those who understand binary, and those who don't." |
|
