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Wannabe Geek

Topic # 23450 30-Jun-2008 06:16
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I have a doubt about communication between DSLAM and BRAS.

Maybe this question is easier and I don't know the answer.

I have a problem and I need to know which IP address some user got in some day and I need log this information, for legal issues:

DSLAM port

My question is:

As my PPPoE authentication are the same to all users, example:
pass: internet

How I could to log IP/port DSLAM delivery to user.

Which device is easier to log, DSLAM or BRAS.

The devices which are used are:

- Alcatel DSLAM, ethernet and ATM (all models, new and old)
- BRAS (Cisco and Juniper)



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3122 posts

Uber Geek
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  Reply # 148378 16-Jul-2008 00:32
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I dont think the dslam keeps a log of the ip address as this is more for the ppp connection. i would guess that the best you could get is who was given the ip address from your dhcp server or your radius server. My reasoning for this is the pppoa connection flows through the dslam much like a vpn connection?

Unfortunatly because everyone uses the same username and password this makes it all more harder to track users.

Now i also wonder if this is an exam question. If you were administering equipment such as DSLAMS in your profession, you would already know how to achieve the logging you need or have set up a logging system when you set up your network for troubleshooting reasons.

Maybe some other GZ user who knows more than me could work out a way?

Ray Taylor
Taylor Broadband (rural hawkes bay)

There is no place like localhost
For my general guide to extending your wireless network Click Here

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Ultimate Geek
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  Reply # 148384 16-Jul-2008 03:32
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You won't find the logs useful on the DSLAM - there is one exclusion to this, which is where the DSLAM is also acting as an IP router/PPP terminator, but given you mentioned ATM DSLAMs this is unlikely.

You will want to check logs on your RADIUS server, and possibly your BRAS.  What you need to know is the IP address and the time/date it was assigned, then your RADIUS server show you the NAS-Identifier and NAS-Port-ID attributes that were in the RADIUS request that had the IP returned.

The NAS-Port-ID will correspond to the logical interface on the BRAS, e.g. atm0/0.12341234 or GigE0/0.12341234.  The logical interface ID will then correspond to the ATM VPI and VCI of the DSLAM and subscriber; or the S-VLAN/C-VLAN of the DSLAM and subscriber.

NB: This gets MUCH trickier if you're operating in an N:1 architecture opposed to 1:1, and you may be stuck for determining which subscriber it was, unless you were inserting the line-id information in the PPPoE PADI or using DHCP Option-82.

I'd suggest that this doesn't have much to do with Telecom or Xtra.

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