RE: Is there a way to have 2 network cards on the samemachine

Question

Sean,
I mean I am always connecting to the nodemgr of the 2nd environment
successfully. Only when I run the client part of the application that I know
is up, I get a response from the Name Server that it is actually the first
IP address.
I checked again. I defenitely have FORTE_NS_ADDRESS set to IP:5004, in my
case, and not the hostname. I don't have FORTE_LOCATIONS set any where. the
NS_ADDRESS for env2 has only 1 IP address associated with it. My Forte
Control Panel on the client, and hence the NS address has only one entry.
I tried going into escript like you said, and the name service still thinks
it is IP1.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
-----Original Message-----
From: Sean Brown [SMTP:[email protected]]
Sent: Monday, June 22, 1998 1:31 PM
To: Venkat Kodumudi; 'Sean Brown'
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same
machine
Hmmmm? That is a little odd! Let me rehash what I think you are saying.
You now have two environments each with their own name service with
FORTE_NS_ADDRESS set to a different IP:Port combination. For example you
are doing the steps:
FORTE_NS_ADDRESS=255.255.255.1:5000
start the nodemgr for env 1
FORTE_NS_ADDRESS=255.255.255.2:5000
start the nodemgr for env 2
Now when you start a client you are always getting the address for env 1
back from the nodemgr. I assume you actually mean the name service? Or, do
you mean you are always connecting to the nodemgr & name service for env
1?
If the first scenario is the case and you are connecting to the nodemgr
for
env 2 but getting back IP's for services listening on the card for env 1 I
would ask you what you are setting the FORTE_LOCATIONS value to before you
start each service. If you are not setting it or are using the host name
it
will register using the IP for the primary network card associated with
the
machine name and I am again assuming that this is env 1. You need to set
the FORTE_LOCATIONS variable to 255.255.255.2:0 (based on the steps above)
before starting your services.
If the second scenario is the case I would have you check what the
FORTE_NS_ADDRESS is set to before you start up the client. Once again it
must be the IP:Port combination not host:port combination if you want to
get
anything other than the primary card.
I would also suggest that you do the following. After everything is up
and
running execute the following commands:
escript -fns "ip for env1":port
findsub nameservice
showpart
What you should see is everything currently registered under the name
service. It will have the name and any "locations" (IP and port) that it
is
registered as listening on. I would look for the nodemgr and see where it
has advertised itself. I would then look for any services you expect to
be
registered there and also verify where the have advertised themselves. If
there are multiple locations listed for any one service, the client will
use
the first one in the list.
Do the same for env 2.
Sean
-----Original Message-----
From: Venkat Kodumudi [mailto:[email protected]]
Sent: Monday, June 22, 1998 9:57 AM
To: 'Sean Brown'
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same machine
I am giving the actual IP address. and not the host name. That is why I
don't understand what is going on.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
-----Original Message-----
From: Sean Brown [SMTP:[email protected]]
Sent: Monday, June 22, 1998 10:53 AM
To: Venkat Kodumudi; 'Sean Brown'
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same
machine
Hello Venkat,
I probably should have mentioned this before. Your are correct. Forteis
doing a host lookup if you are providing a name for examplemachine1:5000.
You can bypass the host lookup by using the actual ip dot addressinstead
for example 255.255.255.255:5000. This way you are taking the name
service
out od the picture and Forte will use the address provided.
Sean
-----Original Message-----
From: Venkat Kodumudi [mailto:[email protected]]
Sent: Monday, June 22, 1998 9:27 AM
To: 'Sean Brown'
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same machine
My requirement is that my second card serves as best case performance
testing piece. This eliminates the network completely. We went one step
ahead and created a new enviromnent for the second card. Whatever I do,
the
nodemgr is returning back the IP address of the first card, even thoughmy
FORTE_NS_ADDRESS does not have the first card in the picture any where.
I think Forte is doing a host look up and returning the first IP address
it
finds, as opposed to returning the IP address specified in theenvironment
variable FORTE_NS_ADDRESS. Is there a way to trick it?
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
-----Original Message-----
From: Sean Brown [SMTP:[email protected]]
Sent: Thursday, June 18, 1998 9:54 AM
To: Venkat Kodumudi
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same
machine
OK, you ran into one of the issues. That is, if both addresses areknown
to
the client that is trying to contact the partition it will always usethe
first address in FORTE_LOCATIONS. This is because FORTE_LOCATIONS was
designed more as a failover mechanism. So it will always try the
first
address in the list and if it succeeds, there is no reason to move onto
the
second.
Now, the second issue is that there is currently a problem with theclient
failover to the secondary address in FORTE_LOCATIONS. If the firstentry
fails it is supposed to retry on the second entry. Instead, it
retries
the
first entry again. I know that Forte knows about this but I do nothave
a
bug number on it.
With that said, lets look at a possible solution for you. If the real
objective here is to have a back up network card available for fail
over
on
the same machine, or use one card to advertise outside your firewalland
one
to use inside, then you will have to contact Forte to determine whenthe
failover problem will be fixed. But, if the objective is to loadbalance
across the network cards you could have the environment manager listenon
both ports and then alternate your server partitions across both
cards.
For
example:
set FORTE_NS_ADDRESS=card1:5000;card2:5000 and then start up the
environment
manager
set FORTE_LOCATIONS=card1:0 (the 0 in the port causes the OS to pick a
port)
and start partition one
set FORTE_LOCATIONS=card2:0 and start partition two
and so on....
In this scenario the environment manager will be listening on bothcards
but
each server will be listening on only one of the two cards. So if a
request
comes in for partition1 it will go through card one and if it is for
partition two it will go through card two. You could assign your
partitions
to cards based on expected load.
Well, I am done. I hope this helps!
Sean
-----Original Message-----
From: Venkat Kodumudi [mailto:[email protected]]
Sent: Thursday, June 18, 1998 8:06 AM
To: 'Sean Brown'; 'John Jamison'
Cc: [email protected]; Jose Suriol
Subject: RE: Is there a way to have 2 network cards on the samemachine
Sean,
Thanks for your reply. I tried the approach. I was not very specificin
my
question. I do need the ability for server applications to listen and
server
on both the network cards.
I was succesfully able to make the nodemgr listen on both the cardsand
actually serve requests coming in from both the cards. But, followingyour
advise, I took a cautious step with FORTE_LOCATIONS. Here is what I
noticed.
I have an application that has 6 partitions in total. I used
FORTE_LOCATION
to make it listen on 1. Both the cards. 2. Swapped the IP addresses
for
both
cards for this application. 3. One card that I want it to listen on. I
tried
all approaches by exporting the locations variable for just this
application. The nodemgr recieves a request from this pc connected onthe
second card to talk to one of the partitions. The node mgr responds
with
a
proxy - with the ip address and socket number of the first card. The
FORTE_NS_ADDRESS variable looks like this:
IP1:5002;IP2:5002.
Is it possible atall to resolve my problem, without having a seperate
environment?
Thanks
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
-----Original Message-----
From: Sean Brown [SMTP:[email protected]]
Sent: Wednesday, June 17, 1998 10:42 AM
To: 'John Jamison'; Venkat Kodumudi
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the
same
machine
Venkat,
Actually, it is possible for Forte to listen on more than one IP andport
combination. The first reply to your message was correct. If you
set
the
FORTE_NS_ADDRESS to contain multiple entries before starting the
name
service, it will advertise on both. For Forte servers you use the
FORTE_LOCATIONS env variable to get it to advertise on multipleip:port
combinations.
We were doing something very similar with another customer I was at
to
get
around a firewall. I will warn you that there are some issues with
FORTE_LOCATIONS that may keep that portion from working. However,
from
reading your note, it appears that all you need is for the nameservice
to
advertise and listen on multiple ports and that works fine. I justtested
it again for sanity sake and it worked. I ran my test on NT using
Forte
3G2.
Sean
-----Original Message-----
From: [email protected]
[<a href="mailto:[email protected]">mailto:[email protected]]On</a> Behalf Of John Jamison
Sent: Tuesday, June 16, 1998 4:51 PM
To: Venkat Kodumudi
Cc: [email protected]
Subject: Re: Is there a way to have 2 network cards on the samemachine
Venkat,
Technically yes this is possible, though not in Forte. A nameserver
can
only listen on one port.
To implement this scheme you will have to write a proxy service (insome
language
including perhaps forte) which listens on the well-known port on the
second card, reads requests, then forwards them to the realnameservice
(wkp on the first card), and forwards replies back. This is not
trivial, but some firewall toolkit vendors supply stub code to write
application specific proxies.
-J
Venkat Kodumudi wrote:
Folks,
Here is what we would like to do:
We want to have 2 network cards on a unix box - which means I have
2
ip
addresses, and the connection between the two is the unix box and
only
the
unix box. I have a pc connected to the 2nd network card and I want
it
to
connect to the nameserver that is listening on a well known port
on
the
first network card. We don't want to turn IP forwarding between
the
two
cards. We want Forte to address both cards to talk to clients, in
one
environment.
Can this be done? If so how?
Thanks in advance.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
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>>>>
John Jamison [email protected]
Vice President and Chief Technology Officer
Sage IT Partners, Inc.
Voice: 415 392-7243 x 306
Fax: [phone]
Internet Enabled Business Change
<a href=
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Answer 1

Hello Venkat,
I probably should have mentioned this before. Your are correct. Forte is
doing a host lookup if you are providing a name for example machine1:5000.
You can bypass the host lookup by using the actual ip dot address instead
for example 255.255.255.255:5000. This way you are taking the name service
out od the picture and Forte will use the address provided.
Sean
-----Original Message-----
From: Venkat Kodumudi [mailto:[email protected]]
Sent: Monday, June 22, 1998 9:27 AM
To: 'Sean Brown'
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same machine
My requirement is that my second card serves as best case performance
testing piece. This eliminates the network completely. We went one step
ahead and created a new enviromnent for the second card. Whatever I do, the
nodemgr is returning back the IP address of the first card, even though my
FORTE_NS_ADDRESS does not have the first card in the picture any where.
I think Forte is doing a host look up and returning the first IP address it
finds, as opposed to returning the IP address specified in the environment
variable FORTE_NS_ADDRESS. Is there a way to trick it?
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
-----Original Message-----
From: Sean Brown [SMTP:[email protected]]
Sent: Thursday, June 18, 1998 9:54 AM
To: Venkat Kodumudi
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same
machine
OK, you ran into one of the issues. That is, if both addresses are known
to
the client that is trying to contact the partition it will always use the
first address in FORTE_LOCATIONS. This is because FORTE_LOCATIONS was
designed more as a failover mechanism. So it will always try the first
address in the list and if it succeeds, there is no reason to move on to
the
second.
Now, the second issue is that there is currently a problem with the client
failover to the secondary address in FORTE_LOCATIONS. If the first entry
fails it is supposed to retry on the second entry. Instead, it retries
the
first entry again. I know that Forte knows about this but I do not have a
bug number on it.
With that said, lets look at a possible solution for you. If the real
objective here is to have a back up network card available for fail over
on
the same machine, or use one card to advertise outside your firewall and
one
to use inside, then you will have to contact Forte to determine when the
failover problem will be fixed. But, if the objective is to load balance
across the network cards you could have the environment manager listen on
both ports and then alternate your server partitions across both cards.
For
example:
set FORTE_NS_ADDRESS=card1:5000;card2:5000 and then start up the
environment
manager
set FORTE_LOCATIONS=card1:0 (the 0 in the port causes the OS to pick a
port)
and start partition one
set FORTE_LOCATIONS=card2:0 and start partition two
and so on....
In this scenario the environment manager will be listening on both cards
but
each server will be listening on only one of the two cards. So if a
request
comes in for partition1 it will go through card one and if it is for
partition two it will go through card two. You could assign your
partitions
to cards based on expected load.
Well, I am done. I hope this helps!
Sean
-----Original Message-----
From: Venkat Kodumudi [mailto:[email protected]]
Sent: Thursday, June 18, 1998 8:06 AM
To: 'Sean Brown'; 'John Jamison'
Cc: [email protected]; Jose Suriol
Subject: RE: Is there a way to have 2 network cards on the same machine
Sean,
Thanks for your reply. I tried the approach. I was not very specific in
my
question. I do need the ability for server applications to listen and
server
on both the network cards.
I was succesfully able to make the nodemgr listen on both the cards and
actually serve requests coming in from both the cards. But, following your
advise, I took a cautious step with FORTE_LOCATIONS. Here is what I
noticed.
I have an application that has 6 partitions in total. I used
FORTE_LOCATION
to make it listen on 1. Both the cards. 2. Swapped the IP addresses for
both
cards for this application. 3. One card that I want it to listen on. I
tried
all approaches by exporting the locations variable for just this
application. The nodemgr recieves a request from this pc connected on the
second card to talk to one of the partitions. The node mgr responds with a
proxy - with the ip address and socket number of the first card. The
FORTE_NS_ADDRESS variable looks like this:
IP1:5002;IP2:5002.
Is it possible atall to resolve my problem, without having a seperate
environment?
Thanks
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
-----Original Message-----
From: Sean Brown [SMTP:[email protected]]
Sent: Wednesday, June 17, 1998 10:42 AM
To: 'John Jamison'; Venkat Kodumudi
Cc: [email protected]
Subject: RE: Is there a way to have 2 network cards on the same
machine
Venkat,
Actually, it is possible for Forte to listen on more than one IP andport
combination. The first reply to your message was correct. If you setthe
FORTE_NS_ADDRESS to contain multiple entries before starting the name
service, it will advertise on both. For Forte servers you use the
FORTE_LOCATIONS env variable to get it to advertise on multiple ip:port
combinations.
We were doing something very similar with another customer I was at toget
around a firewall. I will warn you that there are some issues with
FORTE_LOCATIONS that may keep that portion from working. However, from
reading your note, it appears that all you need is for the name serviceto
advertise and listen on multiple ports and that works fine. I justtested
it again for sanity sake and it worked. I ran my test on NT using Forte
3G2.
Sean
-----Original Message-----
From: [email protected]
[<a href="mailto:[email protected]">mailto:[email protected]]On</a> Behalf Of John Jamison
Sent: Tuesday, June 16, 1998 4:51 PM
To: Venkat Kodumudi
Cc: [email protected]
Subject: Re: Is there a way to have 2 network cards on the same machine
Venkat,
Technically yes this is possible, though not in Forte. A name server
can
only listen on one port.
To implement this scheme you will have to write a proxy service (in some
language
including perhaps forte) which listens on the well-known port on the
second card, reads requests, then forwards them to the real nameservice
(wkp on the first card), and forwards replies back. This is not
trivial, but some firewall toolkit vendors supply stub code to write
application specific proxies.
-J
Venkat Kodumudi wrote:
Folks,
Here is what we would like to do:
We want to have 2 network cards on a unix box - which means I have 2ip
addresses, and the connection between the two is the unix box and onlythe
unix box. I have a pc connected to the 2nd network card and I want it
to
connect to the nameserver that is listening on a well known port onthe
first network card. We don't want to turn IP forwarding between thetwo
cards. We want Forte to address both cards to talk to clients, in one
environment.
Can this be done? If so how?
Thanks in advance.
Venkat Kodumudi
Price Waterhouse LLP
Internet: [email protected]
Internet2: [email protected]
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
Searchable thread archive<URL:<a href=
"http://pinehurst.sageit.com/listarchive/">http://pinehurst.sageit.com/listarchive/</a>>
>>
John Jamison [email protected]
Vice President and Chief Technology Officer
Sage IT Partners, Inc.
Voice: 415 392-7243 x 306
Fax: [phone]
Internet Enabled Business Change
<a href="http://www.sageit.com">http://www.sageit.com</a>
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
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