Re: Demon and Mac are incompatible - Demon

In article <1192813516.872027.87240@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Mike <infected.organism@xxxxxxxxxxxxxx> wrote:

...I just get stars after hop 6 every time I try, even if I leave it
for half an hour.

Blocking traceroute and ping inside your network is a fairly common
practice; most people will let you ping up to their border router, and
nothng beyond that.

What you'll have to do is get pkt traces sending mail with and without the
f/w on. Assuming you know how to fire up a terminal window, this is what you
need to do:

1) Prepare a simple message and address it to (e.g.) "echo@xxxxxxxxx"; this
is a mail reflector that will bounce the mail back to you if it gets there.
Don't send it yet. [Don't put anything in the message, though you might want
to put "test 1" or "test2" in the subject line.]

2) Fire up a terminal window, and enter the cmd

sudo -s

Use your login password (I assume you are the Mac's administrator).

3) enter the command

tcpdump -i en0 -w fw-on.dump tcp port 25

use en1 if you're on wireless. The cmd will just sit there capturing any
pkts sent to port 25 (SMTP).

4) Now send the msg you prepared in step 1.

5) Back in the terminal window, type control-C (type "c" while holding down
the ctrl key); this interrupts the tcpdump command.

6) Now disable the firewall and repeat the above, except that in step 3, use
the command

tcpdump -i en0 -w fw-off.dump tcp port 25


Mail me the 2 files fw-on.dump and fw-off.dump (should be in the top-level
of your "home" directory).

--

Sak Wathanasin
Network Analysis Limited
http://www.network-analysis.ltd.uk
.

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