> On Tuesday 13 March 2001 14:33, you wrote:
>
> > Another machine at 10.0.0.30 running a php program used 10.0.0.100's
smtp
> > to sent a email to an external
> > address and the message got thru.
>
> Kind of dated reply, oh well :).
>
> This seems strange because as far as I know, all 10.*.*.* addresses are
> supposed to be internal only. If true, then if that machine (10.0.0.30)
isn't
> on your network it's sadly misconfigured. I don't see how a machine could
> send data out to the internet with such an IP address.
Sort of.
That is an RFC1918 address (i.e., non-routable on the public Internet).
However, your ISP can (and in a few case I am personally acquitanted with,
CAN) use them for their routers on their own network.
Verizon, formerly Bell Atlantic, for one. If you're a Verizon customer, do a
traceroute - you'll see a 10.x.x.x address along the way. It's not DIRECTLY
reachable from the Internet (you reach one of Verizon's routers that HAS a
public address, which THEN forwards it to the Verizon router at 10.x.x.x,
which then sends it to you).
So, yes, it is possible to see RFC1918 addresses during traceroutes.
