Re: is my ISP lying or stupid?

["Thor (Hammer of God)" <thor () hammerofgod com>]

Actually, those promiscuous sub-VLANs are bad news.  I got a virus from one that turned my hard drive into a floppy.

t 

> -----Original Message-----
> From: full-disclosure-bounces () lists grok org uk [mailto:full-disclosure-
> bounces () lists grok org uk] On Behalf Of Giles Coochey
> Sent: Wednesday, March 21, 2012 8:49 AM
> To: full-disclosure () lists grok org uk
> Subject: Re: [Full-disclosure] 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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