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

[Andy Green]

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On Thursday 24 June 2004 16:21, Andrea Giuliano wrote:

> It's an Ethernet ADSL modem, namely the Siemens Gigaset. I'll try
> tcpdump as soon as possible.

Many times looking at tcpdump in one terminal window and trying things in 
another has given me the big clue :-)  I would be looking at the DNS 
resolution behaviour (UDP port 53 traffic) especially hard first.

> > You should consider turning off ECN as a test too since some routers
> > choke on it.
> > echo 0 > /proc/sys/net/ipv4/tcp_ecn
>
> What's that?

Explicit Congestion Notification.  It is a bit in the TCP header, I think.  
Some router devices cannot handle seeing it and have a mental attack.  FC2 
can issue it by default.

> > Also, what is your network setup like generally?
>
> Well, I started configuring eth0 and ppp0, but in an Italian document I
> found a different suggestion: remove eth0 (using the "Network" menù
> item), then add an xDSL connection with just a name ("Alice"), username

Heh, I just got wifi working here using a similar trick :-)  
system-config-network is really cool once you can get it started with such an 
ifcfg-* file.

I have no experience with ADSL unfortunately, but I would imagine you can do 
tcpdump -i Alice and just see traffic headed down there.

- -Andy

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