Re: Dynamic DNS was Re: Need Linux-friendly ISP

Craig White wrote:
> On Tue, 2004-06-22 at 20:51, Kevin Brown wrote:
>
>>>>They still use the external address. It's just an HTTP connection to the
>>>>service's server and they use the source address from that request as
>>>>yours.
>>>
>>>
>>>Ah, I see. However, you've still got to worry about updating too often
>>>-- I've never used these services before, but I saw a few years ago when
>>>I was looking at these things that DynDNS, at least, will terminate your
>>>account if you are constantly updating due to the load it puts on their
>>>servers if too many people do that.
>>>
>>
>>DHCP leases on most of the high-speed connections I've had have lasted a minimum
>>of 24 hours. Cox@home users have reported having the same IP for years (as long
>>as modem didn't change). So you really shouldn't need to update remote dynamic
>>DNS services that often.
>
> ----
> Actually, just changed my cable modem today (old one died...a Siemens,
> new one from Cox tech, Motorola Surfboard). IP Address still the same.
> Provisioning changes are all that are likely to change your ip address.
> Of course, nothing is guaranteed.
>
> Craig
>
Sorry to hear that, Craig. I have a Motorola Surfboard I'm looking to
get rid of. I could have sold you mine, for less $. (OT: Anyone else
need one?)

I'm a bit surprised that you still have the same IP address. I thought
that DHCP would probably use a new IP after seeing the changed MAC
address (of the modem). Could have been luck of the draw, who knows. It
really depends on how the ISP has their DHCP server configured.

Does anyone here know DHCP really well? I've got a (not pressing, yet)
question. I set up a (RH9) network (firewall/gateway/samba) server for a
local net, acting as a DHCP server. I "hard coded" the DNS addresses
from the ISP into the DHCP server configuration. I also "hard coded" the
IP info for the ethernet device going to the outside (DSL modem, has
DHCP capability, does NAT). How do I configure DHCP and devices so that
both the server (to the lan) side and the client (to the ISP) side are
dynamic? In other words, how does (can) the DHCP client side pass DSN
addresses to the DHCP server side (of the same box, two NIC cards)?
(Hoping this makes sense)

-- 
-Eric 'shubes'
"There is no such thing as the People;
  it is a collectivist myth.
  There are only individual citizens
  with individual wills
  and individual purposes."
-William E. Simon (1927-2000),
     Secretary of the Treasury (1974-1977)
  "A Time For Truth" (1978), pg. 237

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