Another thing to check out are bogons. Bogons are networks that have not been allocated by IANA, which means you should never see them as they "technically" constitute a non-routable address space.
http://www.cymru.com/Bogons -- Dave -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Philip Prindeville Sent: Saturday, January 28, 2006 12:40 AM To: [email protected] Subject: Re: [Mimedefang] Adding support for learning our addresses This is what I came up with. It's been tested on both 32-bit and 64-bit Linux (amd64). If you call IfAddrs::get() and you only get a single interface name/address pair, test it via isunroutable(). If the address ISN'T unroutable, then you shouldn't be seeing anyone connecting to you with this address as the helo (i.e. it's yours and unique). On the other hand, if, like me, your local address *is* unroutable, then it means that you're behind a firewall, and need to do a gethostbyname() on your own name to figure out what your outside address is (i.e. what the address of your firewall is that proxies for you). -Philip _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
