topic Re: random port issue in Operating System - HP-UX

random port issue

Anil_5 — Wed, 25 Sep 2002 19:47:13 GMT

A Java application creates random port connections across the network, is there a way to limit the number of ports or filter the ports as the application cannot be changed at the code level.

Anil

Re: random port issue

Craig Gilmore — Wed, 25 Sep 2002 22:56:58 GMT

Yes, you can limit the range of ports used but since the application cannot be changed at the code level, any port limitation would effect the entire system rather than just this one application.

On HPUX 11.x NDD can be used to set the range for random or wildcard ports.

See the ndd man pages for further information.

On HPUX 10.20 your options are limited. You can either use a low range 1024-4999 or a high range. (sorry, don't remember the starting number off the top of my head.) nettune can be used to change the range and I believe you can tune the starting number, above the 41000 range as I remember.

I would not recommend limiting the entire system, unless this Java application is the only thing running on it.

Regards,

CG

Re: random port issue

Anil_5 — Wed, 25 Sep 2002 23:07:42 GMT

Thanks, any idea of a port proxy which would do this in a application-firewall-backend app server situation.Trying to limit the ports passed thru a firewall.

Anil