full-disclosure - Re: is my ISP lying or stupid?

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Date: Wed, 21 Mar 2012 15:48:43 +0000
From: Giles Coochey <giles@...chey.net>
To: <full-disclosure@...ts.grok.org.uk>
Subject: Re: is my ISP lying or stupid?

On 2012-03-18 16:09, James Condron wrote:
>
> The routers of an ISP are sorta DHCP in the sense that the IPs are
> dynamic- DHCP really works as one network whereas an ISP switch will
> have a series of /30 vlans for obvious reasons. Getting an IP and
> connection is more complex than that but already we're down to a
> series of routers.
>
No, they'd use private VLANs with the default router in a promiscuous 
sub-VLAN. That way they won't have to waste 4 IPs for every customer. 
Customers with multiple IPs can be put in community sub-VLANs, if they 
pay for it.
Networking works very differently within Service Provider networks. A 
lot of it is technology that makes itself look like other technologies 
you might be familiar with, but what is happening behind the scenes is 
actually completely different.

Just thought you might like to know.

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