> BRAS will serve address from a configured poll like DHCP does. If
the > pool is a public pool, then public IP and likewise for
private IP.
> BSNL for e.g serves out public IP addresses while I believe some
> others like serve private addresses. If an ISP serves private
> addresses, he will NAT and also take care that common apps work
> whatever protocol they may use.

Normally ISP will try to avoid NAT at BRAS. Bcoz, 1st: NAT is
resource consuming task, due to need of packet level processing.
2nd: To answer Legal and security issues, like threat mail, ISP
should maintain packet level logs for all the subscribers for nearly
6 months.

Bye :)
-- 
Bharathi S
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