3 Jun
2007
3 Jun
'07
10:46 p.m.
richard(a)routerlab.org <richard(a)routerlab.org> 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:
--
Daniel Roethlisberger <daniel(a)roe.ch>
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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