Welcome to the most active Linux Forum on the web.
Go Back > Forums > Linux Forums > Linux - Networking
User Name
Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.


  Search this Thread
Old 08-05-2006, 08:57 PM   #1
LQ Newbie
Registered: Aug 2006
Posts: 1

Rep: Reputation: 0
cell phone as modem

Hi, I am trying to use my Verizon cellphone LG VX5200 as a modem. I purchased a cable with CD at $15 from . With that it's trivial to use this cellphone as modem under XP. Both "qnc" and the "vzw" methods work. The download/upload speed is 120k/50k. However under Mandriva 2005 linux I got quite some problems.

In the beginning I could not find any corresponding device under /dev/. Then a post hinted me to start the service udev. After that I could find the device /dev/ttyACM0 . Then I could install and run wvdial to dial. However I found the firewall on Mandriva was blocking something so I could not nowhere. After stopping shorewall and iptables I could ping any ip on the internet. But nothing else. I even could not telnet to the dns port of the Verizon DNS server, less to resolve or connect to google. Since I could ping google's ip, it appears to be a firewall problem, but I could not figure out. Do you have any idea?

That was a few days ago. I just give another try, but can not find the device again. I double checked the UDEV service is running. Any more reason?

Thanks, John
Old 08-05-2006, 09:36 PM   #2
HCL Maintainer
Registered: Jan 2006
Distribution: (H)LFS, Gentoo
Posts: 2,450

Rep: Reputation: 77
For the original problem (won't be relevant until you solve the second problem): Can you telnet to google's IP on port 80? What is your IP address (private or public), and how did you get it (DHCP, static)? Sorry I don't know much about cellphone modems, but this seems to be a deeper problem. See what happens when you use a normal modem. What are your other methods of internet connection?

Other than that, the only advice I can give is generic:
  • Make sure that there are no dangling iptables rules left over (look at the output of `iptables-save'). You can eliminate everything (I think) by manually running (The '#' prompt indicates you need root privileges)
    # iptables -P INPUT ACCEPT
    # iptables -P OUTPUT ACCEPT
    # iptables -P FORWARD ACCEPT
    # iptables -F
    # iptables -t nat -P PREROUTING ACCEPT
    # iptables -t nat -P OUTPUT ACCEPT
    # iptables -t nat -P POSTROUTING ACCEPT
    # iptables -t nat -F
    # iptables -t mangle -P PREROUTING ACCEPT
    # iptables -t mangle -P INPUT ACCEPT
    # iptables -t mangle -P OUTPUT ACCEPT
    # iptables -t mangle -P POSTROUTING ACCEPT
    # iptables -t mangle -F
    # iptables -t raw -P PREROUTING ACCEPT
    # iptables -t raw -P OUTPUT ACCEPT
    # iptables -t raw -F
  • Make sure ppp kernel module is loaded (if applicable)
  • Make sure any other means of internet connection are not interfering with your modem connection (look very closely at your routing table)
  • Compare the information (DNS, IP address, DHCP server, and anything else you find appropriate) from a working implementation (windows) to the broken situation.

For the second problem (lack of device file): Think of what is different from then and now (don't tell me nothing's different, because it is obvious that something changed). Make sure all appropriate modules are loaded, etc., etc. Try restarting udevd or manually adding the file. Maybe upgrade to a newer version of Mandriva (NOTE: I am not a Mandriva user, and do not fully know about the intricacies of the community/corporate version distinctions. All I know is that there is a Mandriva 2006).


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Use cell phone as modem Oxagast Linux - Software 4 05-02-2006 12:16 AM
Cell phone as USB Modem tjoris Linux - Software 1 05-01-2006 05:00 PM
RC1 cell phone modem seifenblasen SUSE / openSUSE 1 09-27-2005 02:33 PM
HELP!! usbserial / Cell Phone Modem muzicman82 Linux - Hardware 1 12-22-2003 07:03 AM
cell-phone to modem sparker1968 Slackware 0 04-12-2003 12:22 AM > Forums > Linux Forums > Linux - Networking

All times are GMT -5. The time now is 09:49 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration