Can't connect to raspberry while it uses 3G

[dimmer]

Hi. I plugged in 3G dongle to my rpi and setup internet (2013-07-26-wheezy-raspbian). Internet works well, but I can't connect to the raspberry via putty (SSH). I installed noip. It shows me the ip of the rpi. But even when I try to ping it. It fails.

[marco75]

Same thing happens here. Does anyone have a solution/tip?

[smithg400]

Are you trying to ssh/ping to the 3G network interface? I'd expect that firewalls in the mobile network prohibit this.

[klricks]

It is my understanding that you can't SSH or have a web server or anything else that requires port forwarding with 'broadband' type ISP's because you won't get a public IP address.

[DougieLawson]

What ports does your 3G provider have open? Call their helpdesk and ask. They are probably doing port blocking and traffic shaping.

[marco75]

contacted them yesterday and they said that they do not block ssh, and confirm that we can use it. i'm using no-ip.

[gmc]

Where are you trying to putty from?

Also what IP does the 3G modem assign to the adapter. I've seen some providers assign private IP's but then this is NAT'd on their side to a public IP.

[marco75]

Where are you trying to putty from?

Also what IP does the 3G modem assign to the adapter. I've seen some providers assign private IP's but then this is NAT'd on their side to a public IP.

Probably. but i haven't found a workaround yet.
ip: 10.66.142.203/32

[pluggy]

That is a private IP range which isn't available from the Internet. You'll need some form of tunnelling / real world internet assistance to be able to get to the Pi. Its becoming increasingly common with the limited availability of IPV4 addresses and the reluctance of ISPs to move to IPV6. In most places in Asia, fixed line broadband uses a similar system. Its probably only a matter of time before we all have to suffer it.

[marco75]

FOUND the solution: reverse SSH session at boot.
Now, only thing missing is de usb modem to always be detected as modem 19d2:0031.