Very odd: 30 seconds after FC3 boots, d-link firewall locks up & needs reset!

[Randy]

Hello Wayne,
    Explicit Congestion Notification was disabled.  I put it in the 
sysctl.conf file anyway, and rebooted.  Same problem.  :-(

    I watched the timing a lot more closely this time, and narrowed the 
timing to within the start of about a dozen services.  One is 
mDNSResponder.  When I ran a restart on this one, everything went 
crazy.  The notes on this one say "This is a daemon which runs on Howl 
clients to perform Zeroconf service discovery on a network.  mDNSResponder 
must be running on systems that use Howl for service discovery."  Using 
google, it sounds like this is to allow discovery of network services even 
when there is no DNS server or anything else that would provide this 
information.

    It sure made the firewall howl.  I've disabled it and all seems fine 
now.  I have a DHCP server, DNS server, and SAMBA server running on my 
internal network.  mDNSResponder isn't needed here.

   Thanks for the help.  Without your email, I'd probably not have 
documented timing/services/etc well enough to spot the problem!  :-)

Randy


At 08:06 PM 11/28/2004, Wayne Steenburg wrote:
>On Sun, 2004-11-28 at 19:06 -0600, Randy wrote:
> > Hello,
> >     I've been noticing something VERY strange with my d-link firewall and
> > FC3.  Whenever I reboot an FC3 server, about 30 seconds to one minute 
> after
> > the server has come to the 'log on' screen, the firewall begins to send 
> out
> > massive amounts of broadcasts to my entire home network, bringing
> > everything to a standstill.  The firewall floods my entire 100Mbps network
> > with enough broadcast traffic that almost no packets can get anywhere.
>...<snip> ...
> > Randy
>
>It could be that your router is buggy. Is ecn enabled? From the terminal
>try:
>
>$ cat /proc/sys/net/ipv4/tcp_ecn
>
>If this returns 1, try turning it off with:
>
># echo 0 > /proc/sys/net/ipv4/tcp_ecn
>
>I *think* that's only temporary.  If that doesn't survive a reboot.
>edit /etc/sysctl.conf and add the line
>
>net.ipv4.tcp_ecn = 0
>
>and run
>
># sysctl -p
>
>Wayne Steenburg