Re: FC1 -> FC2: very slow xDSL connection...

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On Friday 25 June 2004 10:11, antonio montagnani wrote:

> >>I think you _may_ be hitting the problem with mozilla and IPV6, which is
> >>turned on by default in FC2. There has been some discussion about this
> >>last week on the list.
> >
> >This sounds interesting. But how can I disable IPv6 to see if it's the
> >cause? Must I recompile the kernel, or have I just to echo something
> >somewhere in /proc?

There's some great advice flying on this thread, I'm sure a solution is coming 
with a few more iterations :-)

The IPv6 thing that I have seen is that DNS lookups can favour IPv6 even when 
there is no ability to route IPv6 "out the door".  You can kill IPv6 (which 
is completely useless assuming you do not use it on your intranet and cannot 
send it out on the Internet), by adding

install ipv6 /bin/true

to /etc/modprobe.conf.

These kind of problems, and another stupid problem I once had of setting my 
private DNS cache IP in /etc/resolv.conf and then taking the machine back to 
my friend to use on the Internet, show up really clearly if you shine tcpdump 
on the traffic :-)

I think trying to discover exactly where the slowness starts to come from will 
be a good clue.  What I understand so far is that ICMP traffic is fine 
(ping/traceroute) but www.google.it (tcp) comes up slowly.  You might find it 
easier to use for example wget -O- www.google.it since this will not try to 
bring in the graphic.  Why not try that with tcpdump in another window and 
paste the result.

- -Andy

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