Simon Hobson wrote:
> That's actually the normal way of doing it - your router gets one 
> address, and further addresses are simply routed to it. If your modem 
> doesn't cope with that then that's your end that's at fault. I can 
> imagine a lot of consumer grade equipment being unable to do it.

I used to have a real routing /30 subnet, a long time ago.  It worked 
exactly as you said: I had an IP address on that routing subnet, and my 
router had its own IP address on another subnet.  My router used both 
addresses to route everything between them.  Worked perfectly.

Unfortunately, with the class of service I have, I no longer have this. 
  Instead, I have a single address, negotiated through PPP (it's PPPoE). 
  I don't have a routing subnet.  Instead, I just have a simple IP 
address, with a unique property: some of its neighbors also get routed 
to me.  So, it's as if I have multiple IP addresses, but I don't have a 
formal routing subnet, or anything like that.

I'd like to be able to configure these "bonus" IP addresses, and teach 
my router about them.  I've been able to do this in Shorewall by adding 
static ppp0:0, ppp0:1, ppp0:2, etc. devices.  Each of these aliases 
contains one of my "bonus" IP addresses.  The main ppp0 device gets its 
IP address automatically assigned during the PPP negotiation, as expected.

Josh

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