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Re: Strange things which should never happen (was Re: RFC 1918)

  • From: Patrick W. Gilmore
  • Date: Sat Jul 15 03:11:37 2000

At 10:14 PM 7/14/00 -0700, Sean Donelan wrote:

>I don't know my TCP/IP stack well enough, but what happens when a host
>with multiple interfaces, one of which is assigned an RFC1918 address,
>receives an packet through another interface with a source address the
>same RFC1918 address. Are the stacks smart enough to realize the packet
>is really an external packet, or will they assume the packet came from
>inside.

Nope - at least none of the ones I have seen.

Strictly speaking, the host *should* not care from which interface a packet is received unless you have some type of firewall/filtering rule-set installed.

TTFN,
patrick