Dear Daniel, and all,
Yes, I confirm if you order a /30, /29, /28, etc to VTX, the first IP of the subnet is
assigned to the CPE with the right mask associated.
> This setup works on Cisco and Zyxel ADSL as the
WAN interface is using
> the IP from the LAN side and the LNS sees both a /32 and a /30
> route...not sure about other xDSL CPEs though (o;
I confirm, this setup works on most of the CPE. For exemple with a /30 you have one IP for
your LAN gateway and one usable. That's normal, it's a /30. :)
Have a nice day,
De : swinog-bounces(a)lists.swinog.ch
[mailto:firstname.lastname@example.org] De la part de Daniel
Envoyé : dimanche, 3. juin 2007 22:46
À : swinog(a)swinog.ch
Objet : Re: [swinog] vtx ADSL /30 subnet practice
richard(a)routerlab.org <richard(a)routerlab.org> 2007-06-03:
This setup works on Cisco and Zyxel ADSL as the
interface is using
the IP from the LAN side and the LNS sees both a
/32 and a /30
route...not sure about other xDSL CPEs though (o;
In this setup, the PPP endpoint address of the CPE router is
the same as it's LAN address, and the customer still gets his
/30 network to use as expected, i.e. there's an address left
for, say, a server.
In the vtx case (if correct), there is nothing of the /30
left to the customer to use, except the WAN address assigned
via PPPoX. Granted, this does not sound very sane, since the
customer pays for a /30 which he does not get.
Maybe the vtx engineers just had bad luck explaining the
above to the customer.
Daniel Roethlisberger schrieb:
>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
>would get an address from an unrelated
address range. The 4
>addresses from the customer's /30 subnet can be used by
>for the network and broadcast addresses (-2),
the router's LAN
>interface (-1), leaving one address for a server or
>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
>last router and the customer's ADSL
router. So in effect,
>ordering a /30 subnet (the 4 fix IP addresses
>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?
doing the same?
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Daniel Roethlisberger <daniel(a)roe.ch>
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