Re: DNS and dynamic updates

OK, so you want to publish it to your external DNS.
1) Technically, you would need to cable modem to register its address in the
DNS. You would need the DNS to accept Unsecure updates. Just conceivably you
could write a script that dumps the cable modem configuration, extracts the
external IP and writes it to the Unsecure DNS.
2) But it isn't going to work in practice, as you don't control how often
the IP address changes, and you can't have an MX or a VPN address changing
all the time.
3) It is a very bad thing altogether to do this with an AD integrated zone
on a DC. The internal DC and DNS zone should never be accessible from
outside.
4) This is what fixed IP addresses are for. You may want to look at this
another way. Ask your ISP if they can handle these inbound services, and see
what they say,
Anthony




"Wlodek Czeczot" <WlodekCzeczot@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:190BA1E2-392A-425E-83DF-772E6FE34D3E@xxxxxxxxxxxxxxxx
I was unclear about our intentions. We want to host our DNS. T1 side is all
fixed ip's. Cable connection is dynamic. We want to grab this dynamic and
put
it in as "fixed" in our dns.
--

Wlodek


"Anthony" wrote:

It is a contradictory request. If you have an external IP, it is resolved
by
external clients using an external DNS. So the address would need to be
updated in an external DNS. It is certainly theoretically possible if
your
ISP supports it. However the new DNS record would need to propagate round
the world's DNS system, so in practice it would need to be a fixed
address.
This is what fixed IP addresses are for,
Anthony



"Wlodek Czeczot" <WlodekCzeczot@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message
news:7B76DD64-C19B-4D5D-B993-9EB7D0E4EFB4@xxxxxxxxxxxxxxxx
Hi,
We are getting cable modem connection for our business. Existing T1
will
still handle all email, vpn and web traffic for our internal web
server.
Cable connection will offload some of our internal users traffic. It
will
have dynamic ip, going through a router with NAT to ISA2004 box. Is
there
any
way to update our internal dns (active directory integrated, servicing
internal clients with DHCP also) with routers WAN address. So we could
make
it secondary MX or vpn access?
--

Wlodek





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Relevant Pages

  • Re: DNS and dynamic updates
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    (microsoft.public.windows.server.dns)
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    (microsoft.public.win2000.dns)
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  • Re: IP Address Change
    ... whether or not there is a firewall or router in between the SBS and the ... cable modem), you may not need to run the CEICW. ... and you will not need to run the CEICW. ... assume that they are not changing their DNS servers. ...
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