Allan Chong writes:
The phone company keeps a record of every incoming and outgoing call
on every line, and performs all sorts of analysis on time of day and
carrier, and who gets paid for it.
[...]
ISPs need
to spend the money to make this a reality and keep accounting data
for at least several days or a week.
The volume of IP datagrams exceeds the volume of calls worldwide by
orders of magnitude.
The cost of a router is orders of magnitude lower than the cost of a
phone switch.
The quantity of data required to log all packets going by is only
about a factor of ten less than the total data crossing the
network. Imagine the size of the disks involved.
In sort, this is not the way to stop SYN attacks.
Perry