Re: Linux2.2.12 and 2.0.36 TCP differences?

[Ralf Baechle <ralf@xxxxxxxxxxx>]

On Mon, May 01, 2000 at 08:18:14PM -0400, Liang Han wrote:

> Telnet and Ftp sessiones go through the new route now. But I also need to
> send another redirect message with Tos set to 0x0 to make Tracetoute
> work.
>   My conclusion is under the scheme of per TOS routing, we can not totally
> rely on traceroute, ping, route and ping programms to determine the
> actual route.       

At least traceroute has a -t option:

[...]
       -t     Set  the  type-of-service  in  probe packets to the
              following value (default zero).  The value must  be
              a  decimal  integer  in  the  range 0 to 255.  This
              option can be used to see  if  different  types-of-
              service result in different paths.  (If you are not
              running 4.4bsd, this may be academic since the nor­
              mal  network services like telnet and ftp don't let
              you control the TOS).  Not all values  of  TOS  are
              legal  or  meaningful - see the IP spec for defini­
              tions.  Useful values are  probably  `-t  16'  (low
              delay) and `-t 8' (high throughput).
[...]

  Ralf