IPv6 dual stack Host Problem

Hello...
I have configured a dual stack VLAN on cisco 6500 switch and assign a ipv6 address on my LAPTOP and connected to the VLAN .but my laptop is not identifying the ipv6 address and gateway is also not pinging from the laptop. rest configuration on swich is ok . what may be the issue . can anyone suggest waht may be the issue.

Dear Sunny,
thank you for your answer.
I've already tried this method. Unfortunately it didn't help, because the upgrade tool is not searching for those packages in other directories.
In the meantime I found out a possible reason of the problem. It seems the usage type of the JAVA is not correct. In configtool I saw it is DW. The list of the problematic components contains all of the XSS components and one other.
I will try the following workaround:
- Undeploy all 'wrong' components before the upgrade
- Remove the components from the stack xml
- Deploy the missing components
BR,
Veronika

Similar Messages

Dual-stacked DCs

I thought I would re-post this here for an answer:
http://social.technet.microsoft.com/Forums/windowsserver/en-US/7882a70f-598e-4606-938e-7b0ddac27fbe/dhcp-dns-ipv6-dual-stack?forum=winserverNIS#eb4944e4-fca7-4dac-af70-c10fbbed68cdthe
the question in short is: has anyone done a dual-stack ipv4 + ipv6 configuration on a domain controller?

Hi,
Thanks for your post.
It's recommended to keep IPv6 enabled on DC.
Please refer to this similar thread:
Disabling IPv6 on 2008R2 Domain Controllers... Best Practice?
http://social.technet.microsoft.com/Forums/windowsserver/en-US/18001bd9-e79f-4f80-973c-3ef0f0b3d2ff/disabling-ipv6-on-2008r2-domain-controllers-best-practice?forum=winservergen
Regards.
Vivian Wang

Dual stack BGP Configuration guide for enterprise CPE

Hi,
I couldn't find the config guide for BGP in a IPv4 & IPv6 dual stack environment for CPE in Cisco website. Hope someone can share the URL.
Thanks

The following URL shows how to configure Multi-protocol BGP - http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/configuration/15-mt/irg-15-mt-book.html.
hth,
-jim

Problem running apache dual stack IPv4 and IPv6

Hello!
I am running a single Lion-Server with one public IPv4 address. Because my Provider is able to support IPv6 now, I ordered a public IPv6 address for my server. (To learn IPv6)
I setup IPv6 address and setup the firewall with ip6fw - everything works fine, I can connect to ssh and afp via IPv4 or IPv6 but when I try to connect to my wiki over IPv6 I get the certificate question (unknown certificate ... blah) click continue and the certificate is loeded againe - I end up in an infinte loop of certificate questions.
The part of the firewall config looks like this:
20515 allow tcp from any to any 443
20516 allow tcp from any to any 8443
20517 allow tcp from any to any 1640
I looked into apache config:
/etc/apache2/sites/virtual_host_global.conf has this entries:
Listen *:443
NameVirtualHost *:443
Listen *:80
NameVirtualHost *:80
I have only one domain and only one single virtual host as defined in /etc/apache2/sites/0000_any_443_.conf:
## Default Virtual Host Configuration
<VirtualHost *:443>
        ServerAdmin [email protected]
        DocumentRoot "/Library/Server/Web/Data/Sites/Default"
        DirectoryIndex index.html index.php /wiki/ default.html
        CustomLog "/var/log/apache2/access_log" combinedvhost
        ErrorLog "/var/log/apache2/error_log"
        <IfModule mod_ssl.c>
                SSLEngine On
                SSLCipherSuite "ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM"
                SSLProxyEngine On
                SSLProtocol -ALL +SSLv3 +TLSv1
                SSLCertificateFile "/etc/certificates/www.ABCDE.de.1A00F8DFC2738F25D26E3248A4C8F687D7EA7F32.cert.p em"
                SSLCertificateKeyFile "/etc/certificates/www.ABCDE.de.1A00F8DFC2738F25D26E3248A4C8F687D7EA7F32.key.pe m"
                SSLCertificateChainFile "/etc/certificates/www.ABCDE.de.1A00F8DFC2738F25D26E3248A4C8F687D7EA7F32.chain. pem"
                SSLProxyProtocol -ALL +SSLv3 +TLSv1
        </IfModule>
        <Directory "/Library/Server/Web/Data/Sites/Default">
                Options All +MultiViews -ExecCGI -Indexes
                AllowOverride None
                <IfModule mod_dav.c>
                        DAV Off
                </IfModule>
        </Directory>
</VirtualHost>
I have not modified the apache config by hand until now - but this was an upgrade from Snow Leopard Server. At the moment I am a littel scared to upgrade to Mountain Lion server because this server runs mail and calender services for my company.
I tried to setup "Listen" entry with dedicated IP-addresses, one for IPv4 and one for IPv6 but this only leads to the same problem - IPv4 works, IPv6 ends in an infinte loop.
I found somewhere that I had to duplicate virtual hosts setup for IPv4 and IPv6 but afaik "Server.app" will overwrite it, right?
Every hint is welcome, bye
Christoph
P.S. Sorry just saw that I posted to ML-Server discussions not Lion-Server, but maybe someone can tell me that I can upgrade without scare.
Message was edited by: Christoph Ewering1

Hello!
Did some more testing and found that FireFox works with the loopback-address.
https://[::1]/
So, the address above works with FireFox after accepting the certificate - Safari loops in the dialog accepting the certificate.
Then I tried the link-local-address but it looks like apache does not listen to that address at all
Then I tried the global-address and got to:
Safari looping in the certificate dialog
FireFox brings an alert „sec_err_bad_database"
BTW this tests were made on the server that runs the apache. So no firewall between the browser and the server.
No one using Mac OS X server in a dual stack enviroment?
Bye,
eweri

Dual-Stack LNS - ppp negotiation fails if no ipv6 prefix assigned by Radius

Hello,
We have an LNS (asr1k), dual-stack CPE and Radius server.
Everything works fine if both ipv4 and ipv6 prefix is assigned to CPE by Radius
If we set Radius server not to assign v6 prefix, we expect to build up an ipv4-only session over ppp.
This is not what happens. PPP negotiation fails with the following debug lines:
IPv6 DHCP_AAA: No authorization data from SSS
Vi2.2364 PPP DISC: Non-PPP hang up
some config parts of LNS:
no ipv6 source-route
ipv6 unicast-routing
ipv6 dhcp binding track ppp
ipv6 dhcp pool IPv6_DHCP_POOL
ipv6 dhcp pool POOL_DHCP_PD
ipv6 multicast-routing
ipv6 multicast rpf use-bgp
interface Virtual-Template99
mtu 1460
ip unnumbered Loopback0
ip tcp adjust-mss 1420
no logging event link-status
ipv6 enable
no ipv6 nd prefix framed-ipv6-prefix
no ipv6 nd ra suppress
ipv6 dhcp server POOL_DHCP_PD allow-hint
peer default ip address pool adslpool_1 adslpool_2
ppp max-configure 3
ppp authentication pap AAA_AUTHEN_PPP_noc3x
ppp authorization AAA_AUTHOR_NET_noc3x
ppp accounting AAA_ACCT_NET_noc3x
ppp ipcp address required
ppp ipcp address accept
ppp ipcp no-renegotiation send-termreq
ppp link reorders
ppp timeout retry 5
ppp timeout ncp 30
ppp timeout authentication 30
end
Can anyone help?
Regards,
Antal

Have opend a case with cisco. The solution for me is to put
no ipv6 dhcp ppp terminate
in to the global config.
Hope that helps anyone who has the same problem.

PIX515e dual-stack ipv4 & ipv6 over PPPoE

Hi Everyone,
In short: I am trying to get ipv4 and ipv6 over PPPoE running on my PIX515e.
Heres a bit more info about my setup and the scenario:
My internet provider (residential) has offered me a dual-stack service on my ADSL.
I get a STATIC ipv4 address, but a DYNAMIC ipv6 address. Additionally I get a STATIC ipv6 /56 prefix for my lan "if my router supports prefix delegation".
My PIX is the 515e and its running PIX 7.2(4) with ASDM 5.2.
Getting the ipv4 side of it working isnt an issue - ive configured the pppoe side of it with my username and password, and configured my outside interface (Ethernet 0) with the ipv4 address.
But I cannot figure out how to get a dynamic ipv6 address on the outside (Ethernet 0) interface.
At this stage all I care about is getting a dynamic ipv6 address on Ethernet 0. I dont care about the "lan" prefix or Prefix Delegation part of it because I figure I'll just NAT my lan ipv6 addresses out to the internet using the dyanmic ipv6 address on the outside interface.
Ive read a lot of articles and looked at a lot of examples but none quite explain what im trying to do.
I have enabled ipv6 on the outside interface - ipv6 enable
and ive looked at ipv6 address and ive found the autoconfigure option but that doesnt appear to fetch the ipv6 address from my internet provider.
I guess im expecting to see something like ipv6 address dhcp or ipv6 address pppoe
So my question is does anyone know how I can get dual-stack working on my outside interface with dynamically assigned ipv6 from pppoe.
Or do i need to update the PIX software on my device. If so, can anyone suggest which version?
Any help is greately appreciated.

I wanted to provide an update on this topic. It turns out the traffic class that I was testing with was overlapping another class's match statement, which had a much lower bandwidth percentage.
After making the corrections, it seems the IPv4 and IPv6 work very well together in the queues. And now that you can run fair-queueing per class, I'm actually impressed with how well it is working.
Now if only I could classify traffic based on the number of packets/bytes seen in netflow.... then I could shape some really nice QoS policies!

Load balancing in dual stack

Hi all,
we have SRM 5.0 which is clustered with one apps server.... SMLG is configured and load balancing is not going well , all the load is going directly to CI not to apps server...
In BI [dual stack] portal the connection to SRM in system administration is configuation is pointing to CI with port 8003.. we changed the the CI host name to virtual address and port to msgserver 8100 where MS is listening .. but still load is coming to CI only.... even the port 8003 is also giving the same result with virtual host name...
Please suggest... where we are missing..
Thanks,
Subhash.G

hi all,
we have made the changed specified in the note and re-bounced the server , still same problem..
In SMMS ->go->Expert functions ->http->Url logon group .... i am not getting any information.. the screen is blank..
The HTTPS port is active and is configued to 8003 in SMICM, but when i check the service in SMMS it's pointing to HTTP and pointing to messgae server port 8100.
If we give the DI host name and port 8003 and portocal to HTTP the message is able to identify and able to do load balancing..
Please show some light...
Thanks,
Subhash.G

Dual Stack NW 7.0 installation with R/3 Backend as UME

I have a quick question guys. I am about to install a dual stack NW system with ADS(SQL server database on windows) and will use a R/3 Enterprise running on unix as the UME datasource. Now this R/3 enterprise backend already acts as bakend for Portal system and uses sap logon tickets and as such already has the user SAPJSF. Now when i actually perform the NW 7.0 installation and enter a master password during the course, would this override the SAPJSF user in R/3 backend system at all.
What are the general problems that are caused with using an existing ABAP only system as the UME for your Java stack(Dual stack actually) systems. Can you advise.
Regards
Kalyan

Hi,
Now when i actually perform the NW 7.0 installation and enter a master password during the course,
would this override the SAPJSF user in R/3 backend system at all.
NO....Not at all..
SAPJSF user is used for the communication between ABAP and JAVA stacks. SAPJSF user is an independent user of each independent ABAP stack.
ABAP data/user-store is the place where the users, roles and authorizations of an ABAP System are stored.
And with the same concept, the UME is the same mechanism for users, roles, permissions of an JAVA system.
After installation of your new NW ABAP+JAVA Stack, you will have to specify the SAPJSF user of ur old R/3 ABAP system which you want to use as User Data Store for ur Newly installed Java System's UME.
In ABAP System section u will have to provide all details of ur SAP R/3 application server, which ur portal is already using as User Data Store.
What are the general problems that are caused with using an existing ABAP only system
as the UME for your Java stack(Dual stack actually) systems. Can you advise.
It depends on the usage of your new application server.
Regards
Bhavik G. Shroff

EHP4 Dual stack

hi guys,
we plan to upgrade Enterprise Dual stack(ABAP+JAVA) System to EHP4 system.
In EHP4 upgrade document it says, No dual stack supported for EHP4 installation..was that mean
only for Installation or upgrade too.
Seperate SID is required for EHP4 system after upgrade? Please confirm.
thanks

hi jaichan,
yes, you are right ..For new installation of SAP ERP to EHP4 level, you cannot install dual stack system..i have read in sap note 855534..please find below the extract from this note:
As of SAP Business Suite 7, you can no longer install Dual Stack Application Systems (ABAP+Java).
If you want to use both SAP Business Suite ABAP and Java Components in your system landscape, you have to proceed as follows:
1. Install a separate ABAP-based SAP Business Suite system.
2. Install the required Java components in a separate Java-based SAP system.
3. Configure the connection of the Java-based SAP system to the ABAP-based SAP Business Suite back-end system.
The SAP Business Suite 7 comprises: EHP4 for SAP ERP 6.0, SAP CRM 7.0, SAP SCM 7.0, SAP PLM 7.0, SAP SRM 7.0
As of now you will find the latest recommendations at a central place in SDN:
https://www.sdn.sap.com/irj/sdn/landscapedesign -> Distribution Models
You will also find information about the deployment of SAP NetWeaver usage types and the SAP Business Suite there.
but you can upgrade your previously installed SAP ERP dual stack system without having seperate SID's thing...
We have upgraded around 50 of our systems without any problem
thanks sunny

PI 7.1(dual stack) and PI 7.31(Single stack) -

Friends,
I have a proxy to proxy scenario - Proxy --> PI --> Proxy
We have two servers PI 7.1(dual stack) and PI 7.31(Single stack)
i did the development in ESR and my ESR is pointing to PI 7.1, when i execute the scenario i receive one error message "receiver could not be determined", i ensured that all my input is correct, still i get the same error message.
the expectation is my scenario should point to PI 7.31, Can some one help me where and what settings i need to make in-order to make it work.
Please Note: All my data is correct and i read some scn forums wherein they asked to refresh the cache , i have refreshed the cache also still the problem persists.
Thanks in advance!

Iñaki Vila
Communication component in ID is the same as sender side.
could you share your sender configuration?
Did you mean Tcode - SXMB_ADM and under that Sender/Receiver configuration
Krupa Rao Atluri
In ID steps are correctly defined.
I spoke to my colleague he hinted that at RUN TIME we want to point to PI7.31, he mentioned config change needed in SXMB_ADM
any further inputs from any one could be useful.

Patching dual stacks ABAP + JAVA simultaneously

Hi,
I would like to know if I can patch ABAP and JAVA on a dual stack system at the same time. According to the patching document I can run an SGEN when the JSPM is running but it does not tell me why I can not patch a dual stack system simultaneously. I have discovered that the JSPM restarts the dispatcher in order to update itself. After this initial step the ABAP stack should remain available providing the kernel has been manually updated.
Does anyone have any advice on this?
Thanks,
James

Hi,
I had a similar case where I had to install a java stack for an already existing CRM system running on Windows/SQL Server.
I installed a different SID for Java on the same host and I installed the Java database as a second database in the same SQL server engine.
Therefore I shared the hardware resources but still had 2 separate stacks as best practice.
Regards,
Olivier

Rebuild our XI application server from Single stack to dual stack

Hello,
We currently have an XI landscape with two application servers, the CI is of course a dual stack system, however the two app servers are single stacked, however we would like to make the two app servers into DUAL STACKs, my first guess was to rebuild the two apps from scratch and reinstall them as a dual stack apps. My Q is:
First: Do we need to rebuild both app servers, or can we make a change to the app servers to modify them to become dual stacked
Second: If we do need to rebuild both these apps, is there a specific document available to do this on Market place for installing a Dual stack app servers with PI?
Thanks in advance.
Sam
<Moved from SAP PI Forum>
Edited by: Prateek Raj Srivastava on May 13, 2010 12:27 PM

Hello,
Thank you all for your feedback,
Denny Liao, it is very interesting question you implied, we do have a J2EE directory created under the /usr/sap/SID/D30 directory:
/usr/sap/XQ9/D30
mqaapz28:xq9adm 13% ls -ltr
total 36
drwxr-xr-x   7 xq9adm   sapsys        96 Aug 24 2009 igs
drwxr-xr-x   9 xq9adm   sapsys      1024 Aug 24 2009 j2ee
drwxr-xr-x   2 xq9adm   sapsys      1024 Nov 11 2009 sec
drwxr-xr-x   3 xq9adm   sapsys      1024 Nov 24 10:48 log
obviously this app server does not have any (jlaunch/jcontrol process running) therefore it is not running as dual stacked. but interestingly enough I do see logs in the
/usr/sap/XQ9/D30/j2ee/cluster/server0/log directory created at the time of the initial install. and under:
/usr/sap/XQ9/D30/j2ee/cluster
mqaapz28:xq9adm 29% ls -ltr
total 30
drwxr-xr-x   2 xq9adm   sapsys      1024 Aug 24 2009 bootstrap
-rw-rr   1 xq9adm   sapsys        39 Aug 24 2009 version.bin
-rw-rr   1 xq9adm   sapsys      6339 Aug 24 2009 instance.properties.vmprop
-rw-rr   1 xq9adm   sapsys      3676 Aug 26 2009 instance.properties
drwxr-xr-x   7 xq9adm   sapsys      1024 Aug 26 2009 dispatcher
drwxr-xr-x 11 xq9adm   sapsys      1024 Aug 26 2009 server0
as per the note you mentioned above (741289 ) this explains how to recover a lost J2EE parameter setup, I am guessing this can be simply followed and re-enable the app server to run as a dual stack.
also my system information for the J2EE on the CI is:
System XQ9
Find other systems in SLD... Message Server
Host: mcsapxq9j
Port: 3924
Enqueue Server
Host: mcsapxq9j
Port: 3224
Database
Name: XQ9
Host: mcsapxq9dbx
Type: Oracle (Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit Production With the Partitioning and Data Mining options)
Software Components all components...
Name Version Applied
sap.com/SAP-JEECOR 7.00 SP21 (1000.7.00.21.0.20091214121410) 20100506125119
sap.com/SAP-JEE 7.00 SP21 (1000.7.00.21.0.20091214121301) 20100506124943
Licenses
Installation Number *** not yet assigned ***
System Number *** not yet assigned ***
Software Product Days Until Expiry
Download system configuration
Instance mqacsz27_XQ9_30 All processes running
Host: mqacsz27
OS: SunOS (sparcv9) 5.10
dispatcher Running
VM system properties...
PID: 21384
Name: Java HotSpot(TM) 64-Bit Server VM
Vendor: Sun Microsystems Inc.
Version: 1.4.2_21-b03
VM Parameters
Cluster
Node ID: 301932700
Kernel Version: 7.00 PatchLevel 76340.450
HTTP Port: 53000
HTTPS Port: 53001
P4 Port: 53004
Telnet Port: 53008
Info for crashes of this node
server0 Running
VM system properties...
PID: 21394
Name: Java HotSpot(TM) 64-Bit Server VM
Vendor: Sun Microsystems Inc.
Version: 1.4.2_21-b03
VM Parameters
Cluster
Node ID: 301932750
Kernel Version: 7.00 PatchLevel 76340.450
Info for crashes of this node
SDM Running
VM
PID: 21400
SDM Port: 53018
So: besides setting up the parameters in the above Note and consider the Load balancing, as there any other major setups required to start this app server as a dual stacked instance?
Thanks in advance.
SAM
Edited by: SAM_ONE on May 14, 2010 3:45 AM
Edited by: SAM_ONE on May 14, 2010 3:55 AM

Homogeneous system copy ECC 6.0 EHP4 dual stack system

Hello ,
I have a requirement of homogeneous system for the below Source system
Source system :
ECC6.0 EHP1 ABAP+java dual stack system with DB2 AIX
Required Target system:
ECC 6.0 EHP1 (same as target system except single stack java not required)
1 .I was trying to use db specific homogeneous system copy method wiht redirected restore script
2. Not possible to get downtime on source system hense it's a production system , then i used target system installaion with homogeneous system copy database specific mehthod
Problem is - it's asking migration export while creating the target system , but i don't have any migration export since i have not exported from source system .
please help us to proceed further.
Thanks in Advance.

2. Not possible to get downtime on source system hense it's a production system , then i used target system installaion with homogeneous system copy database specific mehthod
What did you choose to do in database specific method - DB2 backup/restore ?
//Backup Restore
Homegeneous system copy(database specific method)
Target -
As I understand, you have started IMPORT using SAPinst for target system installation. During IMPORT, what target system installation (only ABAP or what ?) you chose ?
//I took ABAP+JAVA
'Problem is - it's asking migration export while creating the target system , but i don't have any migration export since i have not exported from source system .'
This is because the source system is ABAP+Java, and now during target system installation, then IMPORT procedure is asking for Java Export dump.
Thanks

Single stack vs. Dual Stack - Why does SAP recommend single stack?

Hello SAP,
I am a business partner who specializes in infrastructure consulting for SAP solutions. The SAP Consultants I am working with recently have been recommending that customers install single stack systems. I would like to know why? Are there problems with dual stack systems? Is SAP changing things in a later release and they want customers to be prepared for the change?
From an infrastucture point of view this recommendation combined with SAP NetWeaver architecture will result in an explosion of SID names which leads to an explosion of application server instances and DBMS instances and an explosion of installed servers. I know it is possible to combine SIDs into a single DBMS using MCOD and to have multiple application servers in a single physical server, but there are issues with mulitple application server instances and MCOD use which make normal maintenance operations difficult.
I think it would be much better for customers to install dual stack systems and simply adjust the SAP profile parameters to disable one stack or the other. This way, you could still have 1 stack per application server instance and you would not be have to be creative with SAP SID names!!! Creating a DBMS instance or installing an additional server is not a simple nor economical proposition.
Regards,
Zaz

I am a business partner who specializes in infrastructure consulting for SAP solutions. The SAP Consultants I am working with recently have been recommending that customers install single stack systems. I would like to know why? Are there problems with dual stack systems?
The problems are:
- difficult to size and maintain - Java + ABAP will fight for resources (memory,CPU) and there´s not much one can do to tune if either ABAP or Java as dual stack instance on a single box is running nuts (for whatever reason).
- System copies via R3load - if you want to copy a huge system (let´s say ERP 6.0 + Java stack) you need to use sapinst + R3load to do the copy. Imagine if the system is 1 TB or bigger, this is very time consuming
- Upgrades are complicated - if you upgrade a dual stack system you need to run two PREPARES and two upgrades at the same time - there are sync points each upgrade wait for the other to finish --> difficult to plan in sense of runtimes and even more notes/preparation to do (a dual stack SolMan upgrade from 3.2 to 4.0 had almost 100 notes (technical!) and two upgrade preparation guides...)
- interdependencies - example: you run ERP + EP + BI-Java on one system. You upgrade your BI (which is on a different box) to a new support package. Since the BI-Java need to be in sync with the BI ABAP support package you need to upgrade the EP too - and since there´s a direct dependency (doublestack system) you will need to install support packages on your ERP. So you finally end up in having dependency chains that a total different system (BI) will force you to upgrade/patch your ERP. And if you have e. g. a CRM connected to the same EP you will need to patch that too...
Is SAP changing things in a later release and they want customers to be prepared for the change?
No - the possibility of having a dual stack installation will be still there.
From an infrastucture point of view this recommendation combined with SAP NetWeaver architecture will result in an explosion of SID names which leads to an explosion of application server instances and DBMS instances and an explosion of installed servers. I know it is possible to combine SIDs into a single DBMS using MCOD and to have multiple application servers in a single physical server, but there are issues with mulitple application server instances and MCOD use which make normal maintenance operations difficult.
I agree - MCOD is not a good solution for this problem.
I think it would be much better for customers to install dual stack systems and simply adjust the SAP profile parameters to disable one stack or the other. This way, you could still have 1 stack per application server instance and you would not be have to be creative with SAP SID names!!! Creating a DBMS instance or installing an additional server is not a simple nor economical proposition.
There are 36 * 36 * 36 (minus a few reserved) names for SIDs- this should be enough - also for the biggest customers
Of course one could install both and disable the one you don´t need - but this won´t help in dependency thing. If you e. g. install a dual stack instance for CRM and disable the Java part, you can nicely run it. In case of an upgrade, you will need to upgrade the Java part too (see above) although you don´t use it. The upgrade will detect the doublestack and wait for the java instance to be upgraded too. Same is true vice versa. And believe me: you don´t want that
In fact it is better to separate - that´s at least our experience. The main no-go for such a configuration on our side was the dependency thing. Since they are there and you can´t do much about them we decided to have a 1:1 relationship for ABAP backend and Java "frontend". You will get more instances (and names and databases) but you can patch applications independently from each other. So an implementation of a BI patch won´t imply that you finally also patch your ERP production and other systems that connect to that portal.
There are virtualization techniques available to not need more boxes, you can consolidate them on one machine as if you were installing a dual stack so that is not really an issue. This depends, of course, on the platform and database you use (e. g. Oracle does not support production installations in VMWare). We use for our Java instances Solaris on Opteron (or Intel 64bit) and zones/containers and for the ABAP part we use Linux + Xen. Both virtualization methods come with the OS (so no additional $$$) and both are supported by SAP.
The propagated advantage of having a dual stack installation (shared memory access etc.) is so small that it doesn´t outban the additional complexity - which is definitely there.
I hope those arguments will help to understand SAPs (and the consultants) position - get back if you want more
Markus

System is not assigned to a host problem

HI,
we have installed solman EHp1 7 dual stack and configuration is done using SOLMAN_SETUP. but while using to download of support packages using maintenance optimizer, we are getting the error "system is not assigned to a host" despite filling all the fields in SMSY for both ABAP and JAVA.
Kindly request to advice.

Hi,
You could check the notes and procedure mentioned in the thread:
Re: Error when downloading EHP 4 for ECC - "System is not assigned to a host"
Also in SMSY -> System Components -> Java -> <sid> check if the host assignment is complete.
Regards,
Srikishan

IPv6 dual stack Host Problem

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