[sf-lug] update from computer newbie

John Lowry johnlowry at gmail.com
Fri Jul 7 13:31:32 PDT 2006

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Okay, I know what I am about say is going to be in the ball park, but
specifics might be *off*.

For your firewall, you do not need to leave any services open for
incoming traffic below port 1023. I might be off by one, I forget.
Anyway, those are all services that daemons that are serving will use.
client connections, such as Firefox for web browsing and Thunderbird for
mailing, will make outbound connections on a port above that. So the
connection for a web browser(very simplified) would be:

<your-ip>:<a number greater than 1024> -> www.google.com:80

I could be very wrong about the whole deal, but that is my understanding
of the whole shmageggi. If anyone else with a better understanding of
networking could comment on this and correct any mistakes that would be
much appreciated.

Here is a link to a good explanation of a packets life on the Internet:

Also if you are really worried about what is accessible to the public
Internet, a $40 ($35 if it is on sale) router in between your laptop and
your DSL modem will help out a lot. It will use NAT routing so you
computer will have an IP address that other cannot see on the Internet,
yet you can see everyone else. I recommend a Linksys or D-Link.

jim stockford wrote:
> jim loves it. what do you think bob/jeff?
> On Jul 7, 2006, at 12:46 PM, vincent polite wrote:
>> Hey Bob,
>> I was going to bring this up with Jim. I've started my quest to get my
>> RHCE. I decided to start out with Xandros because it comes with a book
>> called, "Linux Made easy" that I'm reading. I plan to install it on my
>> beater laptop, dual boot, I have some other things I want to do on it.
>> Well, I'm almost done reading the book. I now want to go back and
>> install it, future installs will be RedHat and Fedora. And do all the
>> hands on stuff. I should be ready by Wednesday of next week. I'd be
>> interested in showing up.
>> What do you think Jim?
>> Vince
>> bob sungib <ffejveg at yahoo.com> wrote:
>>  > Hey Jim - don't know if you remember me, but I came to some sflug
>>  > meetings last fall/winter at which you all graciously answered my
>>  > questions regarding buying my 1st computer and installing linux.
>>  After
>>  > many months now, I finally purchased a laptop (I just could not
>>  > justify the space for a desktop). It's an ACER from newegg.com -
>> cheap
>>  > @ $541 - but fine for learning linux, I'm sure. I should be getting
>>  my
>>  > pclinuxos installation cd in the mail today and my goal is to install
>>  > it this weekend (sonic.net tells me I should have my dsl turned on
>> > this coming Monday). I've spent the last few weeks at the library
>>  > canvassing the web for installation guides and help, as well as
>> > printing out the pclos installation guide and reading relevant forum
>>  > posts. Most guidelines unfortunately assume a dual boot install (w/
>>  > Windows) but I prefer to erase MS and have pclos as a sole os on my
>>  > hd. Any suggestions or cautions would be appreciated. I would think
>>  > that erasing Windows would make a  linux installation easier but I'm
>>  a
>> > newbie so who knows?  I understand that once you've done a few
>>  > installs it's a piece of cake but for me it seems very daunting. I'll
>> > give it a go this weekend and see what happens. Hopefully I'm not
>>  > biting off more than I can chew! If I am I'll certainly be calling
>>  out
>>  > to sflug-ers for help. One other question: in setting up a firewall
>>  in
>> > pclos my choices of what to allow are these: Apache Web server,
>>  > BitTorrent, CUPS/IPP print server, Domain Name Server, FTP server,
>>  > ICMP Echo (ping) Request, Mail Server, Open ssh Daemon, POP and IMAP
>>  > server. Many of these are necessary I'm sure to receive e-mail,
>>  > download files, print, etc., but is there anything on this list you
>>  > would suggest to block (disallow)? Thanks for your help.
>> >  
>> > Jeff Gibson    PS: my phone # is 415.626.7095 if it is easier to
>> call.
>> Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great
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