On Friday 09 January 2004 9:54 am, Martin Leduc wrote:
> > Is your IP forwarding turned on?
>
> Yes, it is. Can you explain to me why /32 against /28 netmask, or tell me
> where I can get the documentation?
The /32 and /28 netmasks operate quite simply:
On one interface you use a /32 netmask, which means there is only one
accessible IP on that network - that of the router leading to the Internet.
On the other interface you use a /28 netmask, which means there are 16 IP
addresses (14 usable) accessible on that network.
Linux uses its routing table entries from most specific to least specific, so
if a packet for the one IP address on the /32 network needs to be routed, it
will go in the direction of the Internet. If a packet for any other address
in your public IP range needs to be routed, it won't match the /32 but it
will match the /28, so it will go to the internal network.
The fact that the two network ranges overlap does not matter (despite what you
may read in introductory networking books - this is beyond introductory
networking).
Regards,
Antony.
--
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