What do you do when you run out of ip ports?

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2 total messages Started by Kevin Kelleher Tue, 29 Sep 1992 22:57

#231

Author: Kevin Kelleher
Date: Tue, 29 Sep 1992 22:57

10 lines
819 bytes

I have recently started running out of reserved ports used
by rsh (ports < 1023).

Has anyone found a solution for this problem?

I have run into this on both a Sun running SunOS 4.1.2
and a Solbourne running OS/MP 4.1A.1

Kevin Kelleher				kevink@ncd.com uunet!lupine!kevink
Network Computing Devices (NCD)		415-691-2593

Re: What do you do when you run out of ip ports?

#232

Author: Casper H.S. Dik
Date: Wed, 30 Sep 1992 13:03

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kevink@grant.ncd.com (Kevin Kelleher) writes:

>I have recently started running out of reserved ports used
>by rsh (ports < 1023).

>Has anyone found a solution for this problem?

>I have run into this on both a Sun running SunOS 4.1.2
>and a Solbourne running OS/MP 4.1A.1

There is no way to increase the reserved port space. The only
thing you can do is cut back on rsh-type connections.

There are several consumers of reserved ports:

    outgoing rlogin, one per session, use telnet instead.
    (all ingoing rlogins share the same address)

    ingoing/outgoing rsh (use resp 1 and 2 reserved sockets)
    These should not be long lived. Are people by any chance starting
    x programs are such with 'rsh <host> "xcommand &"' ?
    This holds on to several reserved ports without using them.
    Use one of the x program (xon, xrsh) that closes all the socket end
    points and releases the connection.


Other? Analyse the connections you have and see how you can
reduce the number of needed reserved ports.

Casper
-- 
						|	Casper H.S. Dik
						|	casper@fwi.uva.nl

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