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Thread: What is pan0? & Why 4 nameservers?

  1. #1
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    What is pan0? & Why 4 nameservers?

    Hi Folks,

    Please note: I'm running Xubuntu 8.10-64bit

    Two questiions:

    1. What is this pan0 I see?
    Code:
    bruloo@bruloo:~$ sudo dhclient
    [sudo] password for bruloo: 
    Internet Systems Consortium DHCP Client V3.1.1
    Copyright 2004-2008 Internet Systems Consortium.
    All rights reserved.
    For info, please visit http://www.isc.org/sw/dhcp/
    
    Listening on LPF/pan0/56:e0:82:53:6a:2b
    Sending on   LPF/pan0/56:e0:82:53:6a:2b
    Listening on LPF/eth0/00:13:d3:c3:c4:b7
    Sending on   LPF/eth0/00:13:d3:c3:c4:b7
    Sending on   Socket/fallback
    DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
    DHCPOFFER of 201.235.217.15 from 201.235.217.1
    DHCPREQUEST of 201.235.217.15 on eth0 to 255.255.255.255 port 67
    DHCPACK of 201.235.217.15 from 201.235.217.1
    bound to 201.235.217.15 -- renewal in 8993 seconds.
    
    bruloo@bruloo:~$ ifconfig -a
    eth0      Link encap:Ethernet  HWaddr 00:13:d3:c3:c4:b7  
              inet addr:201.235.217.15  Bcast:255.255.255.255  Mask:255.255.255.0
              UP BROADCAST RUNNING MULTICAST  MTU:576  Metric:1
              RX packets:10445 errors:0 dropped:0 overruns:0 frame:0
              TX packets:6147 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:4026830 (4.0 MB)  TX bytes:652871 (652.8 KB)
              Interrupt:21 Base address:0x8000 
    
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:158 errors:0 dropped:0 overruns:0 frame:0
              TX packets:158 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:7972 (7.9 KB)  TX bytes:7972 (7.9 KB)
    
    pan0      Link encap:Ethernet  HWaddr 56:e0:82:53:6a:2b  
              inet6 addr: fe80::54e0:82ff:fe53:6a2b/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:0 (0.0 B)  TX bytes:2988 (2.9 KB)
    
    bruloo@bruloo:~$
    ---------------

    EDIT


    OK, I found out here: Why is pan0 showing up in Firestarter? that it is Personal Area Networking Profile (PAN) and since I use nothing bluetooth, I did as the OP did and deleted everything bluetooth from my system except libbluetooth3 as the OP said:
    because it looked like it would have removed a bunch of other applications if I had uninstalled it.
    ---------------


    So that only leaves me with the second question:


    and second: Why does my resolv.conf have 4 nameservers?
    Code:
    bruloo@bruloo:~$ cat /etc/resolv.conf
    nameserver 200.49.130.20
    nameserver 200.49.130.21
    nameserver 200.49.130.32
    nameserver 172.20.2.12
    
    bruloo@bruloo:~$ cat /etc/network/interfaces
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    address 127.0.0.1
    netmask 255.0.0.0
    
    # The primary network interface
    auto eth0
    iface eth0 inet dhcp
    bruloo@bruloo:~$
    If I edit my resolv.conf to include only the top three, on next reboot it has the four again.

    Thanks
    Bruce
    Last edited by Bruce M.; December 30th, 2008 at 01:12 AM. Reason: EDIT

  2. #2
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    Re: What is pan0? & Why 4 nameservers?

    bump---

    Q #2

  3. #3
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    Re: What is pan0? & Why 4 nameservers?

    Quote Originally Posted by Bruce M. View Post

    and second: Why does my resolv.conf have 4 nameservers?

    If I edit my resolv.conf to include only the top three, on next reboot it has the four again.
    Which name server shouldn't be there?

    Resolve.conf is edited by NetworkManager every time you connect to a network. This should reflect the name servers that were acquired from DHCP. Are you sure your DHCP server isn't supplying all 4? Try editing reslov.conf to make it as you want and then run "sudo dhclient". Did your resolv.conf return to the way you didn't like? If so, fix your DHCP server configuration.
    Search first, ask questions later!
    From Thread Tools, "Mark this thread as solved" if your problem's been solved.

  4. #4
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    Re: What is pan0? & Why 4 nameservers?

    Quote Originally Posted by bobpaul View Post
    Which name server shouldn't be there?

    Resolve.conf is edited by NetworkManager every time you connect to a network. This should reflect the name servers that were acquired from DHCP. Are you sure your DHCP server isn't supplying all 4? Try editing reslov.conf to make it as you want and then run "sudo dhclient". Did your resolv.conf return to the way you didn't like? If so, fix your DHCP server configuration.
    Well, at the time, I was using Network Manager and editing the file and putting in three didn't help. It is overwritten by NM, and googling for help I found that resolve.config (even today) only reads 3 entries.

    So the fourth entry is never read or used. and since it starts with a 172 I don't worry about it.

    Also, the problem is with my ISP, not my machine, the techies have been "living here" for months trying to figure out why I'm getting micro-cuts every 10 minutes or so starting at +/- noon.

    Today I use Wicd to manage my networking. Much better.

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