iptos man page on DigitalUNIX

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iptos(4)							      iptos(4)

       iptos - Defines the IP Type Of Service (TOS) for FTP and Telnet


       The  /etc/iptos file configures the Type Of Service (TOS) of the Inter‐
       net Protocol (IP) used by FTP and Telnet.

       The TOS field in the Internet datagram is to specify how	 the  datagram
       should  be  handled.  It is a mechanism to allow control information to
       have precedence over data.

       Generally, protocols that are involved in  direct  interaction  with  a
       human  should select low delay, while data transfers that involve large
       blocks of data need high throughput.  Finally, high reliability is most
       important for datagram-based Internet management functions.

       In the Tru64 UNIX operating system, the ftp and telnet applications and
       the ftpd and telnetd daemons  allow  the	 configuring  of  TOS  values.
       These  applications  check to see if the /etc/iptos file exists; if the
       file exists, the applications obtain the TOS value from	the  file  and
       use  that  value to set the TOS field.  If the /etc/iptos file does not
       exist, the applications default to the following TOS values recommended
       by RFC1060: Low delay High throughput Low delay

       Users  who  want	 to  configure	their own TOS values for the TOS field
       should provide the /etc/iptos file.

	    Most IP routers do not differentiate based on TOS,	and  therefore
	    providing values other than the default would have no affect.  You
	    should not change the default values for FTP and Telnet.

       Each entry should consist of a single line of the form:

       Application  Proto  TOS-bits  aliases

       The entry fields contain the following  information:  The  name	of  an
       application TOS entry.  The protocol name for which the entry is appro‐
       priate.	The TOS value to be set for the entry.	A list of aliases that
       exist for the entry.

       Items  on an entry line are separated by any number of blanks, tabs, or
       combination of blanks and tabs.	A number sign (#) indicates  that  the
       rest  of	 the line is a comment and is not interpreted by routines that
       search the file.	 Blank lines in the file are ignored.

       Valid TOS entry names are ftp-control and ftp-data for FTP  and	telnet
       for Telnet.

       The  TOS value for the entry should be one of the following hexadecimal
       numbers, corresponding to TOS bits:  Low	 delay	High  throughput  High

       If  you	need  to  disable  the use of TOS bits, because you are having
       troubling communicating	with  a	 TCP/IP	 host  that  doe  not  conform
       entirely	 with  the  IP	specification, you can disable the TOS bits by
       using the the following settings in the /etc/iptos file:

       # # Format of this file: # Application	Proto  TOS-bits	       aliases

       ftp-control	 tcp	  0x0	ftp-data	   tcp	   0x0	telnet
       tcp    0x0

       The following example shows typical entries in the /etc/iptos file:

       # # Format of this file: # Application	Proto  TOS-bits	       aliases

       ftp-control	 tcp	  0x10	ftp-data	  tcp	  0x08	telnet
       tcp    0x10

       RFC1060, ftp(1), telnet(1), ftpd(8), telnetd(8) delim off


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