topic Re: Use of dynamic ports in Operating System - HP-UX

Use of dynamic ports

Ken Englander — Mon, 13 Dec 2010 18:52:53 GMT

We are working on validating Oracle 11g R2 and have found that Oracle recommends changing the range of dynamic ports for TCP and UDP. We are also validating Serviceguard 11.20. I noticed the following statement in the Release Notes on page 50.

Does anyone know what the documentation means when it states "alter your rules accordingly"? I am concerned there will be a conflict between Serviceguard and Oracle.

Serviceguard also uses dynamic ports (typically in the range of 49152 - 65535) for some cluster services. If you have adjusted the dynamic port range using kernel tunable parameters, alter your rules accordingly.

Re: Use of dynamic ports

Patrick Wallek — Mon, 13 Dec 2010 19:41:44 GMT

>>"alter your rules accordingly"?

I think it is saying that if your dynamic port range in the kernel does not include the range given, then alter your rules to include that range of ports.

Re: Use of dynamic ports

Shibin_2 — Mon, 13 Dec 2010 20:04:23 GMT

I think, it is general thought for you, if you are using additional security software such as IPFilter or Bastille.

Using IPFilter, you can block / unblock ports. If you using IPFilter in SG environment, you should be aware that SG uses these range of dynamic ports, if you face any trouble.

Following thread is similar discussion in an environment of Bastile with SG.

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=977854

Another documentation in IPFilter.

http://docs.hp.com/en/B9901-90029/ch09s01.html

Re: Use of dynamic ports

Stephen Doud — Tue, 14 Dec 2010 12:32:55 GMT

Hi Ken,

The phrase "If you have adjusted the dynamic port range using kernel tunable parameters, alter your rules accordingly." advises the administrator to insure the kernel makes provision for this range of ports (49152 - 65535).

Re: Use of dynamic ports

Ken Englander — Tue, 14 Dec 2010 18:07:44 GMT

Patrick - My difficulty is that I do not know what is meant by the reference to "rules". The links included by Shibin helped in giving me a clue - see below.

Shibin - I think you sent me some good links, in particular defining "rules" as something used with bastille. So, I think maybe that is what the statement means.

Stephen - I appreciate your answer, but I do not understand what you mean. I did find via one of the other links provided that â rulesâ are something used by bastille. So, I think perhaps the document means that these rules need to be adjusted accordingly if bastille is being used.

Do you think that might be the case or is there something else you are suggesting in your response?

Re: Use of dynamic ports

Stephen Doud — Wed, 15 Dec 2010 13:43:35 GMT

The Release Notes are global in nature, so they intend the reader to understand that whatever modifications are made to the kernel with regard to network ports and ranges, ports 49152-65535 and/or this range of ports must be available to Serviceguard. IP filtering such as Bastille and other applications such Oracle must allow Serviceguard to reserve and use this range of network ports.