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

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Message-ID: <58DB1B68E62B9F448DF1A276B0886DF194D9B02D@EX2010.hammerofgod.com>
Date: Wed, 21 Mar 2012 15:59:59 +0000
From: "Thor (Hammer of God)" <thor@...merofgod.com>
To: "giles@...chey.net" <giles@...chey.net>,
	"full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Re: is my ISP lying or stupid?

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@...ts.grok.org.uk [mailto:full-disclosure-
>bounces@...ts.grok.org.uk] On Behalf Of Giles Coochey
>Sent: Wednesday, March 21, 2012 8:49 AM
>To: full-disclosure@...ts.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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