On Sun, Feb 25, 2001 at 08:35:51PM -0600, Brian Grayson (home) wrote:
>   My main computer/gateway has ix0, ix1, and vr0 interfaces.  With the cable
> modem on vr0, things work great w.r.t. NAT on my home subnet.  If I connect
> ix1 to the cable modem, and restart things, ipnat works  r e a l l y 
> s l o w.  Like seconds/minutes between some keystrokes in a telnet
> session.
> 
>   I know the ix* cards aren't exactly modern, but I know they can keep
> up with 180KB/s local downloads, and the CPU can obviously keep up with NAT
> when I use a different interface.  As another experiment (actually, this was
> the first one), I tried setting up another machine as my gateway -- it has ix0
> and ix1 only.  NAT didn't work very well on ix1 there either (same
> slowness symptoms).
> 
>   BTW, I did remember to change my NAT rules in /etc/ipnat.conf when I
> changed the interface.  Are there any other common gotchas?  It almost
> seems like there's some sort of timeout that every single packet is
> experiencing.

This looks like a problem which has been reported by mac68k users: some
mac ethernet interfaces works very slowly with cable modems, when they work
fine on local network. The same hardware works fine under linux with the
cable modem.

--
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
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