Firewall Wizards mailing list archives

Re: The home user problem returns


From: "R. DuFresne" <dufresne () sysinfo com>
Date: Tue, 13 Sep 2005 16:01:27 -0400 (EDT)

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On Mon, 12 Sep 2005, Mason Schmitt wrote:

Brian Loe wrote:


        [SNIP]



Here's an example that's not related to Internet access and bandwidth.
In North America (and starting to become a problem in most developed
nations), smoking is becoming a huge problem.  Smoking is known to be
linked to many forms of cancer, birth defects, gum disease, many
respiratory diseases, etc, etc. - it's a really long list.  Some people
consider smoking to be a personal choice, so lets run with that.  My
first argument pertains more to Canada and other countries that have
public medical systems.

When enough people choose to smoke, they are placing an unnecessary
burden on the public medical system, thereby degrading it for everyone else.


Are they? Will they really? Afterall, considering the above, they are not likely to live as long and thus not going to be within the system as long term as the non-smokers.


You may be one of those militant smokers that feels it is their right to
smoke wherever they please.  If you decide you want to smoke in public,
you may be smoking next to someone that is an asthmatic.  It's well
known that second hand smoke is just as deadly, if not more so, than the
smoke you pull through your filter


Are you certain of this, or is it just another version of overhype in this current time and space? Afterall, think about it a momnet, if I draw smoke directly into my lungs, and exhale and then you breath in a small fraction of what residule smoke is left, it is really more of a health issue for you in a secondary fashion then it was for me in the first intake?


- if you and other militant smokers
get their way, non smokers are now suffering the same health problems
that are common amongst smokers.  Other people may be enjoying the fresh
air or a good meal and you are denying them that.  The effect can even
be as simple as making someone else's clothes stink.  No matter how you
look at it, this is more than just your problem - you are involving
other people that may not want to have anything to do with you.


We face these 'balances;' in many facets of daily life, anytime a majority has to allow the minority to have equal rights and protections though no?



I promised I'd give you an example relating to your use of your Internet
connection.  Here's one really good example for you.

Recently a bot found it's way onto a customer's computer.  That bot
setup shop and began to send spam... through our not-so-smart smarthost.
The bot was also a worm and it started spewing like crazy trying to
find more hosts - it found some on our network and would have found some
out on the net if I hadn't put egress filters in place on our router a
year or two ago.

I got called into work outside normal hours to track down the bot, our
support people had to call the customer to let them know and they also
turned of the customer's modem until the infection was cleaned out.
They then had to start calling other customers and doing the same.

In the short time that the spam was flowing, our mail server managed to
find it's way onto a couple blacklists.  As a result, customers that
didn't get the worm were still being affected because some of their
email bounced due to other mail admins using the blacklists that we
ended up on.  This in turn generated support calls.

I then kicked myself for not having implemented rate limiting and really
basic spam filtering on our outbound smtp relay like I had planned to
and set about working out how I was going to do that.  It turns out that
it not feasible with our current solution, so this week I'm working on
building a new mail server that will allow me to do the egress filtering
I need to do.

All in all, the fact that there weren't more safe guards in place cost
us time and money and affected a fair number of customers.  It has also
pulled me away from other important work and thus I get further behind.

If that doesn't paint a clear enough picture of why you should not be
able to have a wide open un-restricted pipe of your own, let me know and
I'll give you some more examples.


That sure seems like a long way about trying to limit the exposures that got and get you into the fixes you find in your ISP technical position, so, let me ask here again, would it not be simpler, and likely go pretty much untocinted to the vast majority of your users to just lont allow ports 135-139, 455, and 500 and the rest of the windws specifics from leaving your periniters and even actually eliminate it on your braodcasts within? Seems that would be far less work and likely with the ingress and egress filtering eliminate 90% of the issues that hit you and your user base, would it not? and certainly without the support overhead of the vast majority of the plans and solutions you are trying to impliment, yes?

My question to the rest of the list remains: how much would an ISP suffer if they invoked such policies? and invoked such policies with the hitting those that request to be allowed to avoid those limitaions with a service expansion and extra hit from the pocketbook? Rather then give it all away under the basic pricing infrastructure, you make those that wish for the "addon risks" pay for it.


Thanks,


Ron DuFresne
- -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        admin & senior security consultant:  sysinfo.com
                        http://sysinfo.com
Key fingerprint = 9401 4B13 B918 164C 647A  E838 B2DF AFCC 94B0 6629

...We waste time looking for the perfect lover
instead of creating the perfect love.

                -Tom Robbins <Still Life With Woodpecker>
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