Re: directing to specific outgoing port


Dennis de Wit wrote:
how wrote:
Dennis de Wit wrote:
Mumia W. wrote:
On 08/31/2006 12:51 AM, howfuchs@xxxxxxxxx wrote:
I have a command line script which uses php curl to go out to the
internet to retrieve some information. Now this works fine in most
situations except when trying to get of a network where the network
firewall is blocking a range of outgoing ports.I am told by the
'gatekeeper' that the script accesses different ports each time it
tries to get out to the internet. My question is: Can I programatically
direct my script to go out of a specific port that I know is open?

Appreciate any help.

Howard

I can't see anything in the WWW::Curl::easy documentation that shows how
to specify the source port. You probably could perform the change at the
O/S level.

<OT>
For Linux, you could get the kernel source and read
Documentation/networking/ip-sysctl.txt; look at the ip_local_port_range
option.

For Windows, ?


I don't think this can be done on Windows. I also don't think your
fireawll is blocking your outgoing ports, but looks at the port you're
trying to connect to, and blocks it then. It doesn't make sense to block
traffic coming from random ports, without knowing what protocol is used.

But... I'm not a firewall expert, so I might be wrong.

Dennis

On my home network where this works fine, as far as I can from my
firewall window, it seems to be going out of a tight range of ports.
Where the problem is occurring I am told it trying to go out of a wide
range of ports. They are prepared to open one specific port for me. I
know the orginating computer ( where the program will be run) is a
Windows machine, but I have no other information about the network.

Any further information, would be appreaciated.

Howard


As outgoing ports are randomly chosen, it sounds weird to me that they
block those ports. It would mean that that machine cannot establish an
outgoing connection for _any_ protocol.

Besides, I don't think you can manipulate the outgoing port on windows.
(I also don't think you should want to)

what kind of access do you have to this specific windows machine? Can
you use telnet or a remote desktop of some kind?

Do you know whether or not this system is able to connect anything from
the inside? (can it start internet explorer and browse the web?)

Dennis

Thanks for your help.

The inside machine can access the Internet via browser,email and we had
a gotomypc(sp) session ( from my offsite pc to the machine in
question). Can we conclude something from that?

Howard

.

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