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On Sunday 09 November 2003 13:35, Simon Waters wrote: > 172.16.0.0 - 255.255.0.0 ! - - - > - 10.0.0.0 - 255.0.0.0 ! - - > These are null routes (!) they mean any packets for (172.16/16) or > (10/8) are to be discarded. These are RFC1918 address space and should > never be sent anywhere, especially not to your default route. Thank you, interesting. > 127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 > lo > > The (127/8) network is routed via the loopback adaptor. Whilst we > usually think of this as only 127.0.0.1, other addresses in 127.0.0/24 > are sometimes used for local hardware devices like 'time sources'. > Those worried about IPv4 address allocations should not a whole class A > is wasted for 1 address (or one class C), some OSes use a class C for > 127, others a class A, the RFC's are silent on this matter AFAIK. Going off at a small tangent, for the sake of neatness I have used sucessive addresses in 127. to lie about advertising servers, otherwise I would have a hard to read /etc/hosts file. When I move that lot into DNS which if I wait until I understand it like Simon is going to be very very much later I fear, I assume that I could play it either way, giving every advertising host the same address, or retaining the class A network of them. It should be easy enough to read either way. -- From the Linux desktops of Dr Adrian Midgley http://www.defoam.net/ -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.