Packets from net 10 (no, not the lyrics)

bmanning at ISI.EDU bmanning at ISI.EDU
Tue Sep 23 15:54:52 UTC 1997


> 
> What about providers that use portions of the private address space on
> their network (up to and including the client's serial interface)?
> 
> Mohamad
> 
> On Tue, 23 Sep 1997 bmanning at ISI.EDU wrote:
> 
> > > Should I be filtering all reserved space at my border, or would
> > > it be reasonable for me to expect the big guys not to take packets
> > > with clearly inappropriate source addresses?
> > 
> > 	Yes you should. (and with kudos to Andrew)
> > 
> > !	Loopback
> > access-list 100 deny   ip 127.0.0.0 0.255.255.255 255.0.0.0 0.255.255.255
> > !	RFC 1918 private blocks
> > access-list 100 deny   ip 10.0.0.0 0.255.255.255 255.0.0.0 0.255.255.255
> > access-list 100 deny   ip 172.16.0.0 0.15.255.255 255.240.0.0 0.15.255.255
> > access-list 100 deny   ip 192.168.0.0 0.0.255.255 255.255.0.0 0.0.255.255
> > !	Test Network
> > access-list 100 deny   ip 192.0.2.0 0.0.0.255 255.255.255.0 0.0.0.255
> > !	Tiny networks.
> > access-list 100 deny   ip any 255.255.255.128 0.0.0.127
> > access-list 100 permit ip any any
> > 

	The operative phrase here is border. 
	That means ASN border, i.e. where you BGP
	peer with others.  At the provider/subscriber
	interface, within your IGP, using RFC 1918 space
	is ok.

-- 
--bill



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