2.6 slower ppp over dialup than 2.4

[Paul <paula4l@access4less.net>]

Thanks to the bug fixes in 2.6.10, I'm trying it some more.  Now I 
notice that my dialup connection is a bit slower than it was under 2.4.27.

For example, I'm downloading at about 3.0 kb/s versus 4.7 kb/s on 2.4.

I've been googling for advice, but come up empty.  I recall seeing some 
advice back in the 2.6.7 era that it helps to disable ipv4 (or was it 
ipv6) by adding something like 'alias net-pf10-off' to 
/etc/modutils/aliases, but am not sure.

Anyone know how I can fix this?

Paul