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  1. #1

    Troubleshooting RH9 behind PT-3812

    I'm having lots of trouble accessing my RH9 box from my external IP. I have read enough about port-forwarding and DMZ and its just not happening.

    It could be the modem - i've exchanged it for a new one... same prob: everything is working except this.

    It could be the RH9 box however...
    - iptables is all set to ACCEPT
    - tcp wrappers are set to default (host.allow/deny are blank)
    - running an nmap scan displays all necesary ports are open on the local IP
    - all servers are accessable by the local IP

    I tried setting the DMZ to an unused IP and scanned the external IP with an number of scanners all reporting that there are no stealth ports - does this mean its the modem again?

    Is port forwarding conditional of the modems NAT or WAN settings?

    Can anyone please help?

    [root@localhost build_unix]# cat /proc/modules
    iptable_filter 2412 0 (autoclean) (unused)
    ip_tables 15096 1 [iptable_filter]
    ide-cd 35708 0 (autoclean)
    cdrom 33728 0 (autoclean) [ide-cd]
    parport_pc 19076 1 (autoclean)
    lp 8996 0 (autoclean)
    parport 37056 1 (autoclean) [parport_pc lp]
    autofs 13268 0 (autoclean) (unused)
    8139too 18088 1
    mii 3976 0 [8139too]
    keybdev 2944 0 (unused)
    mousedev 5492 1
    hid 22148 0 (unused)
    input 5856 0 [keybdev mousedev hid]
    usb-uhci 26348 0 (unused)
    usbcore 78784 1 [hid usb-uhci]
    ext3 70784 4
    jbd 51892 4 [ext3]

  2. #2
    Linux Guru
    Join Date
    Oct 2001
    Täby, Sweden
    I think the best way to see if the problem lies with the computer or the modem/router is to run tcpdump or ethereal on the computer while sending packets to it from an outside computer.

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