How to use non default port 1521 while 11.2.0.1 grid upgrade to 11.2.0.2

Hi Team ,
We are planning 11.2.0.1 Grid infra rolling upgrade to 11.2.0.2 with out any downtime.
But while up gradation due to default scan port 1521 , 11.2.0.1 databases are not able to connect (remote connections)
We are using 1900 port for existing 11.2.0.1 grid infra scan.
While up gradation it is taking default port of 1521 insted of existing port 1900.
Please provide the solution to use non default port while 11.2.0.2 up gradation.
After upgrade the status as below.
grdoratst104:/apps/grid/grdhome:+ASM4> srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521
Here I was getting TNS:no Listener errors from the client connections.
I have modifyed the scan port then it is working fine.
grdoratst104:/apps/grid/grdhome:+ASM4> srvctl modify scan_listener -p TCP:1800
grdoratst104:/apps/grid/grdhome:+ASM4> srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1800
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1800
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1800
grdoratst104:/apps/grid/grdhome:+ASM4>
Here the problem is we need to do the grid infra upgrade with out downtime,but due this default port issue clients are not able to connect to the database.
Thanks
Bala
Edited by: user12032334 on May 31, 2011 11:46 AM

Why are you using a non default port? It does not improve security. It makes network management more complex. And causes the type of issues that you are facing now.
So before changing defaults, make sure that your reasons are technically sound. And using port 1900 when 1521 is available, is not technically sound by any means.
As for addressing the problem you have created for yourself by mucking around with port numbers. Use a NAT firewall (on each RAC node) to rewrite packets headers received on port 1900 and send these to the server's port 1521 instead (on the VIP or static IP as required).
This can be fairly easily done using iptables if your o/s is Linux. You need to:
a) create a pre-routing NAT rule
b) create a post-routing NAT rule
c) create a forwarding filter rule for port 1900/tcp
d) create an input filter rule to accept traffic on 1900/tcp

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