[X-Unix] MTUs in Panther

[David Gilden]

Greetings, 

Just got Fiber Optics Internet via Verizon,  Problem is the PCs on the network get
a data rate of up to 15 MegaBit, but the Mac is stuck at 4.5 Megabits.

Running Panther -- here....  All switches are 100/10 BaseT

A Verzion tech sent me the following link....
and the link to the Apple KB article, however it is for OSX 10.2   

Does anyone have anyone suggestions on in improving the Data Rate for the Mac (G4 1Ghz...)


Thanks,

Dave Gilden

(kora musician / audiophile / webmaster @ www.coraconnection.com  / Ft. Worth, TX, USA)


<http://www.broadbandreports.com/faq/7136>

Q: How do I tweak in OS X? (#7136)<> A: First of all, if you've run the Tweak
Tester it likely advised you to turn on 'selective ACKs;' unfortunately
selective ACKs are not supported by OS X.

A brief note on MTU values: the default MTU under OS X is 1500, and this will
work fine for most users. Some ISP/router combinations require a user to change
the MTU to a different value, usually 1450. In these cases the change to the MTU
isn't made to improve performance; it ensures functionality. Usually, if not
always, the DSLR Tweak Tester will report the MTU of an OS X machine as 1488 -
this is a misreading on the part of the Tweak Tester caused by OS X having
timestamps enabled (see below).

To change timestamps to off, and eliminate the '1488' (i.e. the erroneous MTU of
1488 reported by the Broadband Reports Tweak Tester), this value:
"net.inet.tcp.rfc1323" should be set to zero.

To restore timestamps, the value should be set to 1 (note: this the system
default.)

There is now a GUI utility called
RMAC<http://homepage.mac.com/johanneson/.cv/johanneson/Public/Tweaker.tgz-link.tgz> 

article<http://docs.info.apple.com/article.html?artnum=107474>, except the
process is automatic - RMAC does all the work.......