We have on ADSL an /24
The Broadcast adresses xx.xx.xx.0 and xx.xx.xx.255 arn't to take
And the xx.xx.xx.1 is for the Router this is correct.
If the costumer are useing 4 IP's he must book 8 IP's than he can use 5 IP's
This is normal...
[mailto:email@example.com] Im Auftrag von Daniel
Gesendet: Sonntag, 3. Juni 2007 21:23
Betreff: [swinog] vtx ADSL /30 subnet practice
It seems that vtx has some very strange way of configuring
the /30 subnet when customers order 4 fix IP addresses.
Normally when someone orders a /30, the ADSL router's PPP
interface would get an address from an unrelated address
range. The 4 addresses from the customer's /30 subnet can be
used by the custumer for the network and broadcast addresses
(-2), the router's LAN interface (-1), leaving one address
for a server or desktop machine.
However, this seems not to be the case at vtx.ch. As two vtx
engineers explained to a (tech-savvy dipl. Inform.) customer,
they use the addresses from the /30 subnet for the PPP link
between their last router and the customer's ADSL router. So
in effect, this means ordering a /30 subnet (the 4 fix IP
addresses option) from vtx gets you the same as ordering a
single fix IP address -- you get a static address on your
ADSL router's PPPoA/PPPoE interface, period. To actually use
the static address on a server/desktop, you need to either
configure destination NAT on your router or operate it in
bridging mode and run PPPoE directly from the server/desktop.
Can anybody confirm that this is current practice at vtx?
Are other providers doing the same?
Daniel Roethlisberger <daniel(a)roe.ch>
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