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

[Ow Mun Heng]

On Fri, 2004-06-25 at 06:34, Andy Green wrote:
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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.
> 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 :-)

You are right.. Just look at these tcpdump rates. (crtl-C after 5 secs)

with Hostname resolving, a 5 sec capture will only capture 3 packets.

1 packets captured
1922 packets received by filter
1798 packets dropped by kernel

W/o  Hostname resolving, this turns out to be like 100+ packets.

245 packets captured
249 packets received by filter
0 packets dropped by kernel

Just Look at the Dropped Packets!!

I've not tried rebooting with that line yet.. But I expect good news