Help with /etc/services

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Operating Systems AIX Help with /etc/services
# 1  
Old 02-21-2011
Help with /etc/services

In my AIX 5.3 box I already have the below entry:
#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.
sapmsDSM        3602/tcp        # SAP Sol Mon System Messaging Service Port

Can I do that or will it impact anything ?

Please assist

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

Last edited by zaxxon; 02-21-2011 at 08:32 AM.. Reason: code tags
# 2  
Old 02-21-2011
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.
This User Gave Thanks to zaxxon For This Post:
# 3  
Old 02-21-2011
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.
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.

Last edited by ctsgnb; 02-21-2011 at 09:45 AM..
# 4  
Old 02-22-2011
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.
This User Gave Thanks to ross.mather For This Post:
# 5  
Old 02-22-2011
Originally Posted by ross.mather
[...]that you need to disable a large number of ports in the /etc/services file[...]
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.

# 6  
Old 02-24-2011
Originally Posted by samsungsamsung
Can I do that or will it impact anything ?

you can do it. it will not harm anything. /etc/services is just a file to map ports/service names/protocols.
This User Gave Thanks to frank_rizzo For This Post:
# 7  
Old 02-24-2011
it will not effect any other can proceed .
This User Gave Thanks to Rajesh_Apple For This Post:
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