Re: help on dial-up backup line
From: SuperGumby [SBS MVP] (not_at_your.nellie)
Date: 10/07/04
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Date: Thu, 7 Oct 2004 23:03:46 +1000
What SBS?
What DNS root hints?
The clients attached to the router in question were SBS clients, the SBS was
at the remote HQ.
The DNS servers in use by the router are an Australian broadband supplier's
(Telstra), they don't allow queries from clients outside the broadband
network. The router automatically picked up and handed them out via DHCP. IF
the router had refreshed the DNS servers handed out by both connections and
fed it's own DHCP server the info a ws reboot would have fixed things, till
the broadband came back, at which time another reboot would have been
necessary. But it didn't, even after failover, even though the router would
be aware that it's DNS settings had changed, it didn't pass the info into
it's DHCP server.
Yes, setting the router's DHCP to hand out alternate DNS addresses available
from both connections was an option. Yes, setting the ws's manually to use
the foreign DNS was an option. Yes, setting the ws's to use only SBS through
the VPN for DNS was an option. There were ups and downs to each solution.
I'm not sure how it was eventually handled, I was at another job when the
decision was made by a colleague.
"Javier Gomez [SBS MVP]" <javier_gomez@REMOVE.THIS.engineer.com> wrote in
message news:u19HFrGrEHA.3876@TK2MSFTNGP15.phx.gbl...
> Hmmm... I always thought that was an issue with all dual WAN routers,
> since how are you going to "refresh" the DNS servers on the SBS box? (even
> if you used DHCP -which wouldn't work on this case- the address would not
> refresh instantly). On the other hand, it is my experience that normally
> external DNS works with both accounts (even if they are totally different
> ISPs).
>
> In any event... that might be a good situation to use root hints instead
> of DNS forwarders.
>
> --
> Javier [SBS MVP]
>
> << SBS ROCKS!!! >>
>
> "SuperGumby [SBS MVP]" <not@your.nellie> wrote in message
> news:eTLiM5CrEHA.3520@TK2MSFTNGP11.phx.gbl...
>> many of us run simple NAT routers in front of ISA, it has been the
>> recommended path for, like, forever.
>>
>> Avoid VPN capable devices, they can interfere with terminating VPN's at
>> the SBS.
>> Ensure the device provides VPN (normally PPTP) passthrough.
>>
>> and if you want one capable of fallback to dialup CHECK TO MAKE SURE THE
>> FAILOVER ACTUALLY WORKS. eg. we wanted one of these recently and sure,
>> the failover to dialup worked but when it failed over it retained the
>> broadband DNS settings, sure, it connected, but you couldn't actually DO
>> anything on the connection.
>>
>> --
>> Mick Malloy
>> http://www.micropol.com.au
>>
>> "John" <John@discussions.microsoft.com> wrote in message
>> news:1752C8B4-5D98-464C-9603-CFD59B281BFC@microsoft.com...
>>> Thank you, Javier and Lanwench. Yes, I agree with you. I will do some
>>> further research on this. I will let you guys know what i find. By the
>>> way,
>>> Javier and Lanwench, have you tried this (add a router in front ISA)
>>> before?
>>>
>>> "Lanwench [MVP - Exchange]" wrote:
>>>
>>>> Ixnay - not a good plan. There are a lot of firewall/router/gateway
>>>> devices
>>>> that have an analog/ISDN backup option for failover. I suggest you look
>>>> into
>>>> one of those and stick it between your server and your cable modem.
>>>>
>>>> John wrote:
>>>> > We are using SBS 2000. We are using ISA server. Sometime my ISP is
>>>> > down (cable internet), I want to use one workstation in SBS 2000
>>>> > domain to have a dial-up connection so that I can use that
>>>> > workstation to connect to the internet while my ISP (cable internet)
>>>> > is down. But how to do this? I know for a standonly PC, it is pretty
>>>> > simple, just add a modem card and add another network connection to
>>>> > it. Any help is appreciated.
>>>>
>>>>
>>>>
>>
>>
>
>
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