On 13-Nov-2007, at 10:35, Robert Bonomi wrote:
On 13-Nov-2007, at 10:08, Drew Weaver wrote:
Hi there, I just had a real quick question. I hope this is found to be on topic.
Is it to be expected to see rfc1918 src'd packets coming from transit carriers?
You should not send packets with RFC1918 source or destination addresses to the Internet. Everybody should follow this advice. If everybody did follow that advice, you wouldn't see the packets you are seeing.
Really? What do you do if a 'network internal' device -- a legitimate use of RFC1918 addresses -- discovers 'host/network unreachable' for an external-origin packet transitinng that device? <evil grin>
You drop the packet at your border before it is sent out to the Internet. This is why numbering interfaces in the data path of non-internal traffic is a bad idea.
Packets which are strictly error/status reporting -- e.g. IMP 'unreachable', 'ttl exceeded', 'redirect', etc. -- should *NOT* be filtered at network boundaries _solely_ because of an RFC1918 source address.
I respectfully disagree. Joe