Date: Sat, 4 Jun 94 04:30:02 PDT From: Advanced Amateur Radio Networking Group Errors-To: TCP-Group-Errors@UCSD.Edu Reply-To: TCP-Group@UCSD.Edu Precedence: Bulk Subject: TCP-Group Digest V94 #109 To: tcp-group-digest TCP-Group Digest Sat, 4 Jun 94 Volume 94 : Issue 109 Today's Topics: Help with setting TCP MSS Regulations for automatic stations TCP-Group Digest V94 #108 Send Replies or notes for publication to: . Subscription requests to . Problems you can't solve otherwise to brian@ucsd.edu. Archives of past issues of the TCP-Group Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives". We trust that readers are intelligent enough to realize that all text herein consists of personal comments and does not represent the official policies or positions of any party. Your mileage may vary. So there. ---------------------------------------------------------------------- Date: Fri, 03 Jun 94 20:18:47 UTC From: ve3dte@ve3dte.ampr.org Subject: Help with setting TCP MSS To: tcp-group@UCSD.EDU Glenn - It may be that you are trying to change the MSS on an attached interface with 'tcp mss'. With the 1.10 code, the MSS is set per interface, not globally. If you set 'tcp mss 2048' BEFORE you attach the interface, it should work. To change the MSS after the attach, use 'ifconfig tcp mss'. This change allows the tcp parameters to be different on different interfaces... good values for 1200bps might not be good on the ethernet side :-) You will have to set all your tcp and ax25 paramaters before attaching hardware, or the defaults will be used. 73, Mark. Mark Frey ve3dte@ve3dte.ampr.org VE3DTE @ VE3CDX.#SWON.ON.CAN.NOAM ------------------------------ Date: Fri, 3 Jun 1994 22:35:13 +0000 (GMT-1:00) From: "Andrzej K. Brandt" Subject: Regulations for automatic stations To: tcp-group@ucsd.edu Hello. I would like to receive some information about the regulations for work of automatic packet stations (BBS, gateways, TCP/IP stations etc.) in your country. I'm asking for such an information, because I was asked to participate in a commission of our radio amateur society (PZK), which will prepare a proposal of such a regulations. Till now there are no special regulations for this kind of stations, but the authorities want to creat a speciall category of licence for them. Because we have heard that their project is full of restrictions, the PZK has taken the initiative and will prepare a proposal. Please help me prepare to my work on that subject by letting me know how these regulations look like in your conutry. All help appreciated. -- 73 de Andy SP5WCA /-------------------+--------+-------------------+-------------------------\ I Andrzej K. Brandt I SP5WCA I andy@mimuw.edu.pl I andy@sp5wca.ampr.org I \-------------------+--------+-------------------+-------------------------/ I I I "Evil indeed is the man who has not one woman to mourn him." I I I I --- Dr. Watson in "The Hound of the Baskervilles" I I I ------------------------------ Date: Fri, 3 Jun 94 7:35:40 PDT From: Glenn Engel Subject: TCP-Group Digest V94 #108 To: TCP-Group@ucsd.edu Glen, As you know, we're using ka9q in our Vector Signal Analyzers. I have the following code in our initialization function: Tcp_mss = 4096; Tcp_window = 8192; The DEF_MSS sets the initial value of mss. You can change it with the tcp nos command: tcp mss 4096 tcp window 8192 I dont know what the "best" value is for AX25. I've also seen improvements in speed by increasing Tcp_window to be very large. As far as performance goes, we've modified ftpsubr slightly to get a lot better thruput but one thing I've noticed is that every single packet received gets it's own acknowledgement. Some systems like hp-ux will ack N packets at once which cuts down on the overhead on both the receiver and sender. -- Glenn ------------------------------ End of TCP-Group Digest V94 #109 ******************************