often need to stop and start DNS service....

[jim]

-----Original Message----- restarting DNS,
since to that interface.
AS after all, you
even sit on for others
to

That's what I indicated to you originally -- so really the
courseware (based on what you say above) doesn't address
the issue of multiple NICs.

And if you think it through a bit there could even be NICs that
don't support DNS -- the only thing the courseware (likely) refers
to is those NICs which will answer DNS queries.

There is NOTHING wrong with using a dynamic address for the
DNS server to forward requests, perform actual recursion itself,or
for other purposes than DNS.

It just won't "serve" on those dynamic IPs -- it actually can do that,
but it doesn't make much sense.

This guys problem is likely that his ISP is invalidating a LEGITIMATE
lease before it expires and then telling him that it is "his problem."

Thanks so much for your help, but I'm not near as
technically savvy as you are and am kindof lost. What
exactly is the "lease" and how do I fix this or what do I
tell my ISP? Appreciate it.

Sure there are errors in the courseware, but
they work themselves out thru the trainers submitting errors to the error
log which we usually check for an update or thru our

private MCT
newsgroup.

It's not that useful to use them blindly as a "reference" however.



--
Herb Martin
"Ace Fekay [MVP]"
message news:[email protected]...

In Herb Martin <[email protected]> posted their

thoughts, then I offered
mine

Well, one of the requirements of DNS is a static IP for proper
functionality. You're probably aware of this being familiar with the
courseware.

If it says this in the courseware it's just silly -- we are talking
about multiple NICs. More likely it says, or at least means, static
for the NIC on which DNS will operate.

[One of the reasons I seldom use the courseware.]

I see what you mean in your previous post. If the IP during that
lease time is being used by DNS, but when it changes, the DNS
service needs to be restarted to recognize the change and bind to
that interface.

It's probably not even DNS (maybe) but rather somehow re-starting
DNS was causing the DHCP client to renew -- IF it's doing what
I believe seems fairly clear.

E.G.: He has a 2 day lease; the cable modem (or DHCP server) re-inits
and loses the lease. Now his address is invalid but he has a
legitimate right to keep using it -- and NO REASON to renew.

The tip-off hear is that renewing the DHCP lease fixes his problem
without having to restart DNS.

I agree that renewing the lease will fix it instead of

restarting DNS,
since

it only makes sense, and at that point, DNS will bind

to that interface.
AS

for the courseware, it loosely says it's a requirement,

after all, you
even

stated, we should have a consistent address for DNS to

sit on for others
to

be able to use the machine. Sure there are errors in the courseware, but
they work themselves out thru the trainers submitting errors to the error
log which we usually check for an update or thru our

private MCT
newsgroup.

So the courseware is good to use.



--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

.

 

[Herb Martin]

Thanks so much for your help, but I'm not near as

technically savvy as you are and am kindof lost. What
exactly is the "lease" and how do I fix this or what do I
tell my ISP? Appreciate it.

When a DHCP client (dynamic IP address) receives an
address (and configuration) from a DHCP server a "lease
time" is part of the info.

The client is ALLOWED to use that address until the lease
expires. If the ISP is re-initializing the cable modem, DHCP
server, or routers (some of these do filtering to keep out rogue
-- unpaid -- clients) before the lease expiration your client
won't "renew" automatically even though the IP is now useless.

This is WRONG of the ISP (their equipment.) If this is it, it is
their fault.

They might ignore you or whatever but that would be my
diagnoses.

(DHCP clients renew at some percentage of lease expiration,
the amount isn't important, and on reboot typically OR when
you type that "IPConfig /renew")

If the ISP won't fix it -- sounds likely -- and the renew solves
it, then I would build some kinds of "background batch file"
that tests the line, and issues the renew if necessary."

I don't think Ping sets the errorlevel so you will have to find
another program to test the net from the batch.

You could just run a renew every 5 minutes or so, I suppose.
(It might irritate your ISP but they likely deserve it if you have
to work around this problem.)

 

[Jim Carlock]

Did you see his IP numbers when posting to the newsgroup?

10.40.1.164
10.40.1.165

--
Jim Carlock
http://www.microcosmotalk.com/
Post replies to the newsgroup.

Thanks so much for your help, but I'm not near as
technically savvy as you are and am kindof lost. What
exactly is the "lease" and how do I fix this or what do I
tell my ISP? Appreciate it.

When a DHCP client (dynamic IP address) receives an
address (and configuration) from a DHCP server a "lease
time" is part of the info.

The client is ALLOWED to use that address until the lease
expires. If the ISP is re-initializing the cable modem, DHCP
server, or routers (some of these do filtering to keep out rogue
-- unpaid -- clients) before the lease expiration your client
won't "renew" automatically even though the IP is now useless.

This is WRONG of the ISP (their equipment.) If this is it, it is
their fault.

They might ignore you or whatever but that would be my
diagnoses.

(DHCP clients renew at some percentage of lease expiration,
the amount isn't important, and on reboot typically OR when
you type that "IPConfig /renew")

If the ISP won't fix it -- sounds likely -- and the renew solves
it, then I would build some kinds of "background batch file"
that tests the line, and issues the renew if necessary."

I don't think Ping sets the errorlevel so you will have to find
another program to test the net from the batch.

You could just run a renew every 5 minutes or so, I suppose.
(It might irritate your ISP but they likely deserve it if you have
to work around this problem.)

 

[Ace Fekay [MVP]]

In

When a DHCP client (dynamic IP address) receives an
address (and configuration) from a DHCP server a "lease
time" is part of the info.

The client is ALLOWED to use that address until the lease
expires. If the ISP is re-initializing the cable modem, DHCP
server, or routers (some of these do filtering to keep out rogue
-- unpaid -- clients) before the lease expiration your client
won't "renew" automatically even though the IP is now useless.

This is WRONG of the ISP (their equipment.) If this is it, it is
their fault.

They might ignore you or whatever but that would be my
diagnoses.

(DHCP clients renew at some percentage of lease expiration,
the amount isn't important, and on reboot typically OR when
you type that "IPConfig /renew")

If the ISP won't fix it -- sounds likely -- and the renew solves
it, then I would build some kinds of "background batch file"
that tests the line, and issues the renew if necessary."

I don't think Ping sets the errorlevel so you will have to find
another program to test the net from the batch.

You could just run a renew every 5 minutes or so, I suppose.
(It might irritate your ISP but they likely deserve it if you have
to work around this problem.)

What's going on is the modem binds (or marries) itself to the MAC of the
NIC. That's how they control how many IPs, etc, a modem will give out. And
yes, cable companies have been using this for years. That's the cable
company mentality, especially Comcast. This is why I would rather just use a
Linksys or Netgear (or any other broadband router/modem) for my connection
to them.

Now I hear Comcast is pulling something about dis-allowing NAT'ing... They
keep thinking in the "cable" mentality, where they want to charge for every
connection, like they do when they charge for a connection to each TV set.
With networking, why would they want to think that? If you NAT, then you''re
sharing the connection, but it's still using the same bandwidth, whether
mutliple machines or one machine on the network.


--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

 

[Jim]

I'm going to give calling my ISP (Comcast) a try for now.
Let you know if I learn anything...

 

[Herb Martin]

I should have mentioned: If you are having this problem
and cannot PING or use your web browser with an IP
address -- in other words the Internet is unreachable --
when the DNS server is also having trouble the don't
mention the DNS server.

Keep it simple -- if you can -- only discuss the communication
problem as a CLIENT.

If you lose IP to the internet, and then perform "ipconfig /renew"
which fixes it, then just keep it to that.