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RE: (FWD) Re: ISP Cutoff

A Dlink wifi router is exactly what I have.  I appreciate the feedback.

It sounds like throttling (or "rate limiting" as Roger put it, if that's the
same thing) the bandwidth might address that issue, would it not?



-----Original Message-----
From: Matthew Sullivan [mailto:mattsull@xxxxxxxxxxxxxxx] 
Sent: Friday, June 17, 2005 11:08 PM
To: or-talk@xxxxxxxxxxxxx
Subject: RE: (FWD) Re: ISP Cutoff

In my experience problems with connections dieing after a while are due to
crappy NAT routers.  I have had this problem with a Lucent DSL NAT
Router/modem, and a DLink WiFi router.  The problem seems to be with
excessively small NAT connection tracking tables, and then when the tables
get full, the routers are either unable to purge old connections before they
time-out or do a lousy job of doing so (ie they purge important
My advice would be to setup a Linux or OpenBSD box as router. (I run TOR on
my Linux router).  Either that or get a hardware router that runs Linux such
as the Linksys WRT54G(S) Then set the number of tracked connections to a
very large number such as:
echo "32768" > /proc/sys/net/ipv4/ip_conntrack_max
see: http://www.netfilter.org/documentation/FAQ/netfilter-faq-3.html#ss3.3
I assume that something similar can be done to *BSD google for info on
messing with the WRT54G (you probably want to use a custom Firmware of some
sort that has SSH)

On Fri, Jun 17, 2005 at 02:34:16PM -0400, Pat Frank wrote:
> Hey all.  I've been having some problems with my ISP disconnecting me
> few minutes while running a Tor server.  Here's some technical

Are you sure it isn't just a stability problem with your router? People are
quick to assume that everybody is out to censor them, when often nobody is
paying attention at all. :)

(The rate limiting option will help with instability problems too.)