RE: NetBIOS Messenger spam - how did it get in?

From: Jef Feltman (feltman@pacbell.net)
Date: 10/30/02 

Date: Wed, 30 Oct 2002 00:05:44 -0800
From: Jef Feltman <feltman@pacbell.net>
To: 'Damon McMahon' <inst_karma@hotmail.com>, security-basics@securityfocus.com

1. Is this possible? I would have thought any packet
with such a spoofed IP address would be deemed
non-routable by any of the routers between the source
host and mine, and hence would never make it to my host?
The destination (your external address) is routable. Source is ignored
unless prohibited. Non-routable addresses are not allowed to be the
destination on the public Internet.

jef

Relevant Pages

  • Re: Routing question
    ... For the data flow from PC A toward PC B, the source IP and destination ... It's a basic concept that is discussed in any "Networking for Dummies" ... a host determines that it must send a packet to ...
    (comp.dcom.sys.cisco)
  • Re: IP address.
    ... layer of local machine.or else just forwards the packet to next ... appropriate router or to the host machine. ... The kernel routing table decides where to send an IP packet. ... (matching the destination IP address against (destination and genmask) ...
    (comp.os.linux.networking)
  • Packet Coming From Router Disappears
    ... I have a host with a destination IP 172.16.10.24 on the same IP Class C and ... same ethernet segment as one network adapter of a Windows firewall whose IP ... I have a sniffer running on both firewall and destination ... I see the packet leave the 172.16.10.5 interface. ...
    (comp.dcom.lans.ethernet)
  • Re: Configuring OVMS TCPIP SMTP server to discard undeliverable mail???
    ... I think this is part of the problem - by default, routers are ... concerned with the destination of a packet, ... Prev by Date: ...
    (comp.os.vms)
  • Re: How to detect cycle in a network?
    ... > 3 routers are directly connected in a triangular manner. ... > If packet comes to r1, it should forward the packet to the destination ...
    (comp.os.linux.networking)