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, Jerome

-----Message d'origine----- De : swinog-bounces@lists.swinog.ch [mailto:swinog-bounces@lists.swinog.ch] De la part de Daniel Roethlisberger Envoyé : dimanche, 3. juin 2007 22:46 À : swinog@swinog.ch Objet : Re: [swinog] vtx ADSL /30 subnet practice

richard@routerlab.org richard@routerlab.org 2007-06-03:

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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;

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.

Cheers -Dan

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cheers rick

Daniel Roethlisberger schrieb:

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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

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for the network and broadcast addresses (-2), the router's LAN interface (-1), leaving one address for a server or

desktop machine.

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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

...

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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?

-Dan

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