Re: ISA array at HO and cache server at remote sites
- From: puja gugnani <puja_gugnani@xxxxxxxxx>
- To: "\[ISAserver.org Discussion List\]" <isalist@xxxxxxxxxxxxx>
- Date: Sun, 4 Aug 2002 09:40:10 -0700 (PDT)
Thanks Jim,
Would it be correct to say that:
1) The clients at the remote site would point to the
local proxy/cache server (downstream ISA server)
2) The down stream server will periodically poll the
array at the head office to get the array member list
and will compute the hashing algorithm (URL+server).
It will then send the request to specific ISA server
in the array which has the highest hash value. What i
like to confirm is that does this hashing function at
the downstream compute the exact upstream server to
which the request is to be sent or do we need DNS
round robin to send the request to the alternate
servers in the array and then the array decides which
server will respond to the request based on the
hashing function. Is that what you meant by the
routing scrip at the downstream server.
3) As for the clients at the head office, i agree we
will configure them to use the array name and define
the name in the DNS, would it be required that the DNS
use round robin for assigning the requests to the
specific server in the array
Thanks again
--- Jim Harrison <jim@xxxxxxxxxxxx> wrote:
> http://www.ISAserver.org
>
>
> Inline...
>
> Jim Harrison
> MCP(NT4, W2K), A+, Network+, PCG
> http://isaserver.org/authors/harrison/
> Read the books!
>
> ----- Original Message -----
> From: "puja gugnani" <puja_gugnani@xxxxxxxxx>
> To: "[ISAserver.org Discussion List]"
> <isalist@xxxxxxxxxxxxx>
> Sent: Sunday, August 04, 2002 4:51 AM
> Subject: [isalist] ISA array at HO and cache server
> at remote sites
>
>
> http://www.ISAserver.org
>
>
> We have an internet leaded line at the head office.
> All the remote offices connect to the head office to
> access the internet. I have an ISA Server Array
> containing 2 ISA Servers (integrated mode) at the
> head
> office. I'm placing 1 ISA Server (downstream server)
> at the remote offices for proxy/caching purpose thus
> forming a hirerchial chain.
>
> 1) Can the downstream ISA Server compute the hash
> and
> send the request to the appropriate server at the
> hea
> office? If so what will be needed at the downstream
> server to do so?
>
> ** downstream ISA servers can be told to use the
> routing script and will behave as any other web
> proxy cleint in that case
>
> 2) If not will I need to implement DNS round robin
> at
> the remote sites to send the request to the
> alternate
> servers in the Array at the Head Office, which will
> then use CARP hashing algorithm to compute the
> server
> which should respond to the request.
>
> ** bear in mind that CARP is array-limited and
> arrays are site-limited. Since the downstream ISA
> is
> unlikely to be a member of an upstream array, it
> won't play in the CARP sandbox
>
> 3) How will the client computers in the head office
> be
> configured to access the array?
>
> ** Ideally, you would configure the ISA array to use
> the array name and create a DNS entry for that
> name.
>
> Thanks in advance
>
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