New subject: vtx ADSL /30 subnet practice

4 Jun 2007

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

 richard(a)routerlab.org &lt;richard(a)routerlab.org&gt; 2007-06-03:
  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

 cheers
 rick

 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   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?

-Dan

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RE: [swinog] vtx ADSL /30 subnet practice