On Thu, May 10, 2007 at 07:04:51PM +0100, Plant, Dean wrote:
> Weird... Tell me about it, I spent a lot of time head scratching trying
> to figure out why network connections would just mysteriously hang.
> Eventually found reference to a problem with tcp_window_scaling and
> firewalls and after disabling tcp_window_scaling on my test CentOS 5
> box, everything started working.
>
> The install does not get far enough for the shell console to be
> available, it hangs at the transferring stage2.img.
>
> Dean
Ah, probably before %pre even has run (?) Well you could rebuild the
kernel on the install CD to disable window scaling by default. :) Ok,
not a particularly useful option... maybe someone else will have a
suggestion.
In HP-UX you can pass kernel parameters at boot-time, I wonder if
anything similar could be done? Probably not.
Have you captured a tcpdump of what happens when the "freeze" occurs
with an intermediary system? Maybe a setting could be changed on your
switch? Although I would doubt the switch would be a factor. Are your
packets going through an intermediary router?
I plan to do some network installs of CentOS 5 soon, will be
interesting to see if this issue occurs.
Ray
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