It's not a routable address (in the sense of Internet routable) - read RFC 1918.
However, it can be used - perfectly properly - within your ISP's area of influence. For example, overlaying the 12.0.0.0/8 space AT&T (now Comcast) uses for their cable modem system is a 10.0.0.0/8 space assignments used for the management interfaces of the Cable Modems. AT&T/Comcast may choose to route these addresses within their internal networks, that's perfectly ok. But they're not allowed to leak these addresses to the public Internet. This means every device has two IP addresses (perfectly legal), one which is exposed to the public and one which - absent some work on the users' part - is hidden and NOT exposed to the public. Also perfectly legal. The 10. address is probably spoofed, or it's coming from inside... -----Burton -----Original Message----- From: Damon McMahon [mailto:[EMAIL PROTECTED] Sent: Monday, July 07, 2003 12:46 AM To: [EMAIL PROTECTED] Subject: Continued probing with source IP 10.x.x.x Greetings, My firewall logs are recording repeated hits on 110/tcp (POP3) from what I believe is a privately-assigned IP address - 10.128.108.4. All of these hits have the ACK flag set, some of them have combinations of the PUSH, RST or SYN flags set too. I have a POP server on our network but it services internal requests from our internal 192.168.0.0/24 subnet only. We have a dynamic public IP address, but this phenomenon is spanning DHCP reassignments of this address. Is this a simple port scan from outside, or should I be more worried? Any assistance or advice will be appreciated! Damon _________________________________________________________________ Hotmail is now available on Australian mobile phones. Go to http://ninemsn.com.au/mobilecentral/signup.asp --------------------------------------------------------------------------- Evaluating SSL VPNs' Consider NEOTERIS, chosen as leader by top analysts! The Gartner Group just put Neoteris in the top of its Magic Quadrant, while InStat has confirmed Neoteris as the leader in marketshare. Find out why, and see how you can get plug-n-play secure remote access in about an hour, with no client, server changes, or ongoing maintenance. Visit us at: http://www.neoteris.com/promos/sf-6-9.htm ---------------------------------------------------------------------------- --------------------------------------------------------------------------- Evaluating SSL VPNs' Consider NEOTERIS, chosen as leader by top analysts! The Gartner Group just put Neoteris in the top of its Magic Quadrant, while InStat has confirmed Neoteris as the leader in marketshare. Find out why, and see how you can get plug-n-play secure remote access in about an hour, with no client, server changes, or ongoing maintenance. Visit us at: http://www.neoteris.com/promos/sf-6-9.htm ----------------------------------------------------------------------------
