Static ip address DSL customers

[050878james]

Hello !!

I have a question about MAC-IP address binding. The problem is, today we use the PPPoE for DSL customers, but we will begin to give them "static ip address" for those who need it, I know we can sett the dynamic ip as static in the RADIUS server, but I will rater skill it the PPPoE is dynamic ip address assigment while the static must not be trough PPPoE but we just give them static ip address, so the customers can configure that ip address in their routers.

So back to my problem and question, the question is how can I bind the ip address for these users ?? We use IP-DSLAM (ATM Switch) in the PSTN. Our router is already configured for static ip in the separate VLAN, so I am not sure how can I bind the ip address because let`s say we give one user the ip address 80.80.80.5 and we will this user be able to use ONLY this ip address, so EVEN if he tries to sett 80.80.80.6 than he must not be able to use this ip address, but the only one we gave him.

I was thinking about static ARP table where we bind ip address to an MAC address of the IPDSLAM switch port, but this is not a solution because he can than just pick up another ip and put it manually in the router, so this is not good chooice.

Any great suggestions ?? how these things are handled in case static ip address assigment anyway ??

[050878james]

say thank you to your collegue from me ;) this was great idea anyway.

Well just today we have around 25 000 dsl customers, and over 2 000 have asked us for static ip address, often young peoples :) p2p sharing and BitTorrent downloads, problems with opening ports if the ip is not fixed.... So you understand the rest.

And we have a great policy, if our customers will have static ip address they are welcome to get it !! Many isp`s denies this solution maybe it is not so easy to find a secure way to assign them these ip addresses, same problem as I have, therfore I am looking for someone who did this before. PPPoE is not an option in my case because I see the static ip AS FIXED IP and no PPPoE I think you understand me. And there where some problems at the begining with activations of the modems very wired things, but fixed ip just write it in the config and you`re on the net :) the best solution.

cheers

[050878james]

I know one ISP near me is assigning only static ip addresses to their customers, they never used PPPoE. And I called one of their customers and I asked him to make some test, and it was:

I asked him the ip address, and let`s say that ip address was 80.80.80.5 so I told him log on to the router and change it to 80.80.80.6 and let me know if you can access the internet, and he tryed and tol me NO no way, ok I said try now 80.80.80.4 the same again, ok I said try use DHCP option se if they will assign that ip to you, hi tried but the router have not received any ip address, which means no dhcp is used at all and he can only use the assigned address 80.80.80.5. and after I saw there was not tolk about /30 network addresses.

So it is possible but I am not sure how :(

No help to ask them, because I know they wont tell it anyway..

Is there peoples who you could ask about it ?? So we don`t need to use the DHCP server at all.

Cheers

[bjornarsb]

Hi again!

I've talked with the isp and he says that depending on your DSLAM this can be done at the dslam port. i.e the dslam does not perform routing but it "understands" and can analyse layer 3, and then you map the dsl port with one ip, and thats the only ip thats works. I'm not sure about your Zyxel dslam, but ask your distributor. I know that some IPS's actually have implemeting routing on their dslam's but then you have to "replan" your subnet and summary policies.

HTH,

Regards

Bjornarsb

[aftabsiddiqui]

For static IP assignment in DSL, we are using the following technique. This will assign the IP from the BRAS without going to RADIUS.

interface ATM1/0.x multipoint

ip address 80.80.80.1 255.255.255.0

pvc user_pvc 1/2

protocol ip 80.80.80.2

ubr/cbr xxx

Client will take 80.80.80.2 as its WAN IP and 80.80.80.1 as gateway for /24 subnet. Other than WAN IP it will not be able to use any other IP from the subnet because only one IP is mapped against its VPI/VCI.

[050878james]

THANK YOU very much for helping !!!

just little explanation, we use Zyxel IPDSLAM, and VPI/VCI are configured on IPDSLAM, so we have VLANS configured on the 7200 Router. Example below :

On 7200 router:

int fa0/0.20

Description ip_addresses_for_dsl

encapsulation dot1Q 20

ip address 80.80.80.0 255.255.255.0

On the IPDSLAM VPI VCI are configured 0/33, so the switch ports on the DSLAM are assigned to VLAN 20.

Than the question is how it will be now with example you provided me ?? I can`t see any VLAN definitions, how can I know that this ip 80.80.80.2 the client will use is binded to the IPDSLAM port ??

Thank you again !!

Cheers

[050878james]

in my last post I forgot to describe this better :

Than the question is how it will be now with example you provided me ?? I can`t see any VLAN definitions, how can I know that this ip 80.80.80.2 the client will use is binded to the IPDSLAM port ??

I mean:

Than the question is how it will be now with example you provided me ?? I can`t see any VLAN definitions, how can I know that this ip 80.80.80.2 the client will use belongs the DSLAM switch port where this user is connected to ??