Les Mikesell wrote:
The machine is running CentOS-5.6 . The modem is running fine, but my speed has not been improved threefold, as promised. In fact the speed is identical to the previous modem, as far as I can tell.
Do you know what kind of change this was supposed to be?
No. I was rung one day by a lady at my ISP (Eircom), who told me I had been chosen as a recipient of their new "Ultimate" system, which would increase my speed from 5Mb/s to 14Mb/s, at no extra cost! Apparently this was not available to any old customer; I had been specially picked out for the privilege. I can't think of any reason why I should be picked out, except that I always pay my bills.
(I have been with them for ever, and remember being told by them long ago that scientists had proved it was physically impossible for traffic down a telephone line to exceed 300b/s .)
If you are running DSL with PPOE it might have been a registry tweak for windows to reduce the MTU. On Centos you can just put MTU= in your ifcfg-eth? file with the value you want (I've seen 1492 suggested for this).
It is PPPoE, I think. I'll try changing the MTU sometime, and see if it has any effect. Thanks for the suggestion.