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- Newsgroups: comp.os.os2.networking
- Path: sparky!uunet!cs.utexas.edu!sun-barr!ames!haven.umd.edu!darwin.sura.net!jvnc.net!nuscc!eletanjm
- From: eletanjm@nuscc.nus.sg (TAN JIN MENG)
- Subject: IBM TCPIP
- Message-ID: <1992Aug13.170501.23162@nuscc.nus.sg>
- Organization: National University of Singapore
- Date: Thu, 13 Aug 1992 17:05:01 GMT
- Lines: 77
-
- Great package - the TCPIP stuff from IBM - quite UNIX like networking.
- Some Questions though ...
-
- 1) I start my X clients using rexec. The problem is that although I use
- start rexec ... to start the X client, I always leave a cmd.exe session
- in a window everytime I exit the client. Is there anyway I can avoid
- having to clean up after everytime?
-
- 2) My talk doesn't seem to work. The talk daemon correctly receives the
- talk connection request from the outside (an SGI machine) but I can't
- establish the connection when I do the subsequent "talk user@host"
-
- 3) How cum my TCPIP works without portmap running? Is it necessary and
- then for what?
-
- 4) I can't seem to install a default route (I have only 1 gateway). The
- machine just refuses to route this way. I actually have to add each host
- route individually.
-
- 5) The fonts option in "PMANT" seems to be corrupted. I get fonts listed
- such as 0x0 1240x203, 0x4 and other ridiculous font sizes. what gives?
-
- 6) Most irritating fault. My normal usage for X is this :
- - I start xterm using "start rexec ..."
- - from xterm I launch X clients. eg "> xv * &" or "xclock &"
- Every once in a while, either all my X clients feeze or the xterm
- freezes (no keyboard input) or even the whole PM desktop (this is rare)
- hangs. This happens most often when I close the X client window or
- choose the quit option in the X client. So far I get by by killing the X
- client from my xterm. This is not only inconvenient but also does not
- totally elinimate either the Xserver or the PM desktop crash.
-
- Am I doing something wrong or is the fault with the PMX itself?
-
- 7) X is a bit sluggish. Can I do anything to speed it up?
-
- 8) I'm not sure I understand the docs about color table in PMX. All I
- know is that my gifs and jpg files in xv (using a 1024x768x256 driver)
- look inferior to when I view them on the SUN (also a 256 color display).
- How can I improve it?
-
- Other than the above, its a great package - lots of programs with a
- distinctly unix feel. For those who don't know, here's a short list
- (from the top of my head)...
- ftp and ftpd
- tftp and tftpd
- telnet telnetd vt100 vt220
- bootp bootpd
- route routed
- rsh rshd
- talk talkd
- nfs nfsd
- mail
- snmp
- netstat
- nslookup
- ping
- finger fingerd
- tracerte (ala UNIX traceroute) (with source code)
- rn (with source code)
- nstat (PM version of netstat with source code)
- named (with source code)
- ipgate (for simple packet filtering I think)
-
- Some idea of performance ...
- my old dos network stuff does ftp at an average rate of about 40KB/sec
- the IBM ftp does about 250KB/sec.
-
- Of course, I think the X performance is rather sluggish (though I have
- no experience with other PC X servers). Also, I think it is a straight
- port of the X code that does not take advantage of multi-threading under
- OS/2 (the MIT X server only has one main thread serving a "dispatch
- loop"). With multi-threading, performance would not only improve but
- also reliability would go up (eg have one thread per X client). You can
- take this as a humble (and unsolicited!!) suggestion IBM ;-)).
-
- jin meng
-