Re: Configuring OVMS TCPIP SMTP server to discard undeliverable mail???
From: Alan Greig (greigaln_at_netscape.net)
Date: 11/29/05
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Date: Tue, 29 Nov 2005 11:34:25 GMT
JF Mezei wrote:
>
> If within your own ISP, it is common. Many ISPs use unroutable IPs for
> some of their router infrasctructure within their intranet. This makes
> then unaccessible from the outside world. But it also allows customer
> traffic of unroutable IPs to flow within the intranet.
Indeed and I came across a case where two customers of a major network
service provider were able to send SNMP traffic between their two
private corporate networks by configuring a PC with a certain IP address
on the provider's "network management" subnet at each site. And this was
about the time there was a very serious Cisco bug allowing remote
control of the router via stack overflow attacks hidden in SNMP packets.
-- Alan Greig
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