[gentoo-user] how can I do in this situation? (too strict ..

Hello. I am working in my clients company 1000 miles away from my own
company. I just brought with me my notebook and plugged network cable in
my clients company. I am in a consulting company.

Now is the problem: our company's internal database system sits on 70
port (http), our company's documents are on ftp server (21 port) and I
need to fetch some files from my own desktop computer through scp (22
port). Now I can do nothing for my customer. Now I realized this company
has too strict firewall (or VPN, I am not sure). I cannot detect network
route path by traceroute(1) (always time out), and I found I could only
access two ports to any host outside client's office: 80 port and 443
port. The network deparment of my client is very slow responding and
have strict regulations. I already convinced the customer I cannot work
in this situation, but I hope I could solve some problems instead of
waiting several days for the customer administrator open the ports for
me. What can I do?

If I could ssh to my own desktop computer it's okay, I could use remote
control to get whatever I want. But port 80 is taken (we are on a NAT
network). I wish I could do a scan to see what other ports (besides 80
and 443) are not blocked, so I could adjust my host to listen ssh
connection on that port. But how do I detect what port is not blocked by
their firewall?


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Zhang Weiwu wrote:
> I wish I could do a scan to see what other ports (besides 80
> and 443) are not blocked, so I could adjust my host to listen ssh
> connection on that port. But how do I detect what port is not blocked by
> their firewall?

- Start tcpdump on a host that is connected on the outside of the firewall.
- Try to open a connection to this host on every port (from the inside).
- Check the tcpdump for connection attempts.

Christoph
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