Eko Priono <[EMAIL PROTECTED]> wrote on Fri, 18 Jun 1999:
>On 18 Jun 99, at 7:12, David Colston wrote:
>
>> First of all, Net-Tamer does not do BOOTP. It does Dynamic IP addressing
>> and Dynamic DNS Server Assignment. ...
> ...
>Now I'm confused. How could you pass DNS server info without
>BOOTP or DHCP? If DNS assignment can be done during PPP
>negotiation, then surely something is missing in the current
>DOSPPPD+WATTCP implementations.
For dial-up connections, the dynamic assignment of IP addresses
for the client (and the DNS server address) is an optional (but
widely used) part of the PPP protocol.
To be more precise: The dynamic assignment of the local IP
address is done via option 3 of the IP control protocol (= the
network control protocol part of PPP). The details can be found
in RFC 1332, "The PPP Internet Protocol Control Protocol".
The dynamic assignment of the DNS server address is done via
option 129 (Primary DNS Server Address) and/or 131 (Secondary
DNS Server Address). The details can be found in RFC 1877, "PPP
Internet Protocol Control Protocol - Extensions for Name Server
Addresses".
As an author of commercial internet software, I have done tests
with many ISPs in Europe. So far, I have not found any ISP that
would not support option 3 (dynamic IP address assignment), and I
only found 1 ISP (AON = the Austrian telecom) who does not yet
support option 129.
So, for a dial-up client access via PPP, you need neither BOOTP
nor DHCP for IP/DNS address assignment. You may well need these
protocols, however, if your IP connection is established without
the use of PPP.
- Wolfgang Redtenbacher
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Redtenbacher Software Tel.: +49 7159 17046
Roemerstr. 11/1 Fax: +49 7159 17047
D-71272 Renningen e-mail: [EMAIL PROTECTED]
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