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RE: blocking private address ranges

I can name Comcast/ATTBI as one the passes 10/8 Addy's. Its quite funny how
you can ping other Cablemodems everywhere.
Amir Seyavash Mesry 
LSI Logic Corporation 
Raid Support Test Technician 
6145-D Northbelt Parkway 
Norcross, GA 30071 
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>-----Original Message-----
>From: Chris Reining [mailto:creining@packetfu.org] 
>Sent: Monday, April 07, 2003 12:44 AM
>To: Sancho2k.net Lists
>Cc: pf@benzedrine.cx
>Subject: Re: blocking private address ranges
>On Sun, Apr 06, 2003 at 09:54:42PM -0600, Sancho2k.net Lists wrote:
>> I see a lot of sample rulesets making a point to block RFC 1918
>> ranges - but I have to ask, is it really feasible that packets with
>> these source addresses would really reach anyone's interface? Unless
>> firewall is connected to a network addressed as such, doesn't simple
>> routing by definition prevent such a possibility?  Would 
>these packets
>> even feasibly be routed to the network you are trying to protect?
>They do! It is not big news that there are ISPs that have 
>dismal ingress
>and egress filtering on their borders.