high speed DSL connectivity

[Fraser Campbell]

On Monday 15 September 2003 21:00, Teodor Iliescu wrote:
> On Mon, 15 Sep 2003, James Knott wrote:
> > You're a bit confused.  While IP address from RAS or other dial up
> > access appear dynamic, they don't use dhcp.  Normally, a phone line is
> > assigned it's own IP and whatever computer connects to that line, gets
> > that IP.  If there are multiple lines, there will be mulitple IP
> > addresses, and whichever address you get, depends on what line you
> > connect to.  From the user point of view, the addresses are dynamic (not

I missed the fact that this conversation was about Microsoft's RAS, maybe I'm 
confused with another conversation?

> How would a client get a static IP, if when he connects, he gets a
> different line? This is, assuming the client paid for the static IP, and
> the ISP set him up.

Way back when I'd stated that dialup doesn't use DHCP, I was thinking of 
dialup in the ISP sense where people dial into a terminal server and get a 
ppp connection.  While I've never seen dhcp used for this that might be 
because I've only seen Livingston Portmasters, perhaps other terminal servers 
do use dhcp.

In the case of a Livingston portmaster you assign the terminal server a range 
of IPs and it allocates IPs on a first-come/first-serve basis from the bottom 
of the pool.  First 5 lines will get first 5 addresses, if line 4 disconnects 
as line 6 is connecting then the 6th line will end up getting the 4th IP.  
This assumes no static assignment of IPs which can be done in RADIUS or in a 
local users file on the terminal server itself.

> If you say the IPs are statically set on the phone lines, then how would
> the ISP hand out dynamic information to the RAS clients, if say one of
> their DNS servers goes down? Options such as default gateway, primary and
> secondary DNS are scope options set at the DHCP server.

Why would they need DNS to assign you an IP?  Why would they need DHCP to 
assign you a DNS server ... those assignments are generally handled within 
the ppp protocol.  Then again, if we're talking about Microsoft's RAS server 
I could be way off base.

> An article, that relates to this:
> http://www.winnetmag.com/Articles/Index.cfm?ArticleID=5413
>
> Does anybody else have some input on this?

God help any ISPs that use Microsoft RAS for their dialup solution, glad I've 
escaped any such attrocities so far.

-- 
Fraser Campbell <fraser-Txk5XLRqZ6CsTnJN9+BGXg at public.gmane.org>                 http://www.wehave.net/
Halton Hills, Ontario, Canada                       Debian GNU/Linux

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