AIX

Hi
In my AIX 5.3 box I already have the below entry:

Code:

#cat /etc/services | grep -i 3602
infiniswitchcl  3602/tcp                # InfiniSwitch Mgr Client
infiniswitchcl  3602/udp                # InfiniSwitch Mgr Client

Now I got an requirement to add the below entry in the same port number 3602.

Code:

sapmsDSM        3602/tcp        # SAP Sol Mon System Messaging Service Port

Can I do that or will it impact anything ?

Please assist

Moderator's Comments:

Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks.

If there is not already a service running at this port, you will have no problem. You can check with netstat -an| grep "\.3602" if one is currently up. But usually the /etc/services is just prepared with entries for well known ports.

Just follow what Zaxxon stated.

Just for info (because it is not relevant in your case), but in some very special case, you may want to add aliases into /etc/services , this could be done entering entries this way.

Code:

infiniswitchcl  3602/tcp sapmsDSM

(i used such kind of notation once, many years ago and that was on an HP-UX system (or maybe solaris ... i'm not sure) , not sure how the other OS handle it)

... and for sure the /etc/services were initially not designed in that purpose.

There is a pre-requisite for running SAP that you need to disable a large number of ports in the /etc/services file before installing the SAP application.

Services 32xx, 33xx 36xx 48xx need to be removed.

I'm not sure if you, ross, meant it that way, but i would like to point out the following for clarification: the file /etc/services is just a translation device for port names to port numbers, similar to the /etc/hosts file, which translates host names to IP addresses. Its content is mostly derived from RFC1700.

Removing an entry there will in no way close or disable a certain port, just like removing an entry from /etc/hosts will not prevent communiaction with the mentioned host.

To disable communication via a certain port one will have to resort to some layer-4 filtering, i.e. firewalling: IPSec, iptables or something such.

I hope this helps.

bakunin

you can do it. it will not harm anything. /etc/services is just a file to map ports/service names/protocols.

it will not effect any other services.you can proceed .