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Harris, David (IT Solutions US) david.k.harris@siemens.com
Mon, 22 Oct 2007 15:00:38 -0700 (PDT)
I know a few shops with more than 2k console ports...so we both have a fair bit of headroom... but, thanks for clarifying your point. That's probably a valid thought, unless the code were doing something seriously stateful, where it could use the same listener for many different IPs, and use the IP to keep the conversations straight. I don' tthink that's the (current) case.) -Z- -----Original Message----- From: John Hascall [mailto:john@iastate.edu] Sent: Monday, October 22, 2007 2:28 PM To: Harris, David (IT Solutions US) Subject: Re: limit to number of consoles? > Hmmm... the number of TCP ports isn't usually an issue, as the > connections are often made across multiple devices, i.e.; > > Console 1 TS-1 port TCP 7001 > Console 1 TS-1 port TCP 7002 > Console 1 TS-1 port TCP 7003 > Console 1 TS-1 port TCP 7004 > Console 1 TS-2 port TCP 7001 > Console 1 TS-2 port TCP 7002 > Console 1 TS-2 port TCP 7003 > Console 1 TS-2 port TCP 7004 > Console 1 TS-3 port TCP 7001 > > So, clearly a re-use of the TCP port, spread across many IP addresses > for the assorted console servers. That's the port number on the remote end. Each one of those connections is using a port# on the conservere end too. For example: delos: {1} netstat -an | grep 7001 tcp 0 0 172.17.2.254.59046 172.17.2.14.7001 ESTABLISHED tcp 0 0 172.17.2.254.59081 172.17.2.11.7001 ESTABLISHED tcp 0 0 172.17.2.254.59106 172.17.2.13.7001 ESTABLISHED tcp 0 0 172.17.2.254.59195 172.17.2.12.7001 ESTABLISHED tcp 0 0 172.17.2.254.50994 172.17.2.3.7001 ESTABLISHED tcp 0 0 172.17.2.254.51007 172.17.2.2.7001 ESTABLISHED tcp 0 0 172.17.2.254.51021 172.17.2.1.7001 ESTABLISHED ^^^^^ local ports (1024-65535 available) > You can also mix-and-match console servers, using some of the > DECservers, adding newer units from other vendors, simply replacing the > TCP ports used by that vendor. :-) > > The limits you need to think about are how much disk space for log > storage (include retention time in your calculations...), and RAM for > enough children processes. :-) We're good there. I was mostly worried about some unknown to me internal limit (a table size or something), but I see at least one person has 3x the consoles I do, so for the present I see nothing to worry about. Thanks, John