User:Scott/04

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   Network Troubleshooting
--------------------------------
Home Page      user:scott
Tech Support   user:scott/02
Dir & Files    user:scott/03
Network        user:scott/04
Troubleshoot   user:scott/05
Laptops        user:scott/06
Resources      user:scott/07
Notes          user:scott/08

Template:TOC limit

DHCP syn ak

sudo dhclient

Open Ports (view)

nmap -P 0 localhost (sudo apt-get install nmap)

netstat -l

TCP/IP Open Connection

lsof -i    (domain names)
lsof -i -n (ip address)

DNS (view records)

dig well.com

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Reset Modem and Router

Unplug Modem and Router
Reset Modem and Router (paper clip)
Reboot Machine

Browser Off-line?

BASH Shell (TS connection)

Adapter or Onboard

lspci

lspci - Ethernet controller: Broadcom Corporation NetXtreme BCM5752 Gigabit Ethernet PCI Express (rev 01)

lsusb

lsusb - Bus 001 Device 003: ID 13b1:0026 Linksys

DHCP

DHCP Discover

sudo dhclient

Listening on LPF/eth0/00:17:08:5f:dc:73
Sending on   LPF/eth0/00:17:08:5f:dc:73
DHCP-REQUEST of 192.168.1.8 on eth0 to 255.255.255.255 port 67
DHCPA-CK of 192.168.1.8 from 192.168.1.1
bound to 192.168.1.8 -- renewal in 36968 seconds.

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ifconfig

ifconfig

eth0  Link encap:Ethernet  HWaddr 00:17:08:5f:dc:73  
      inet addr:192.168.1.8  Bcast:192.168.1.255  Mask:255.255.255.0

wlan0 Link encap:Ethernet  HWaddr 00:18:39:1d:31:d0  
      inet addr:192.168.1.7  Bcast:192.168.1.255  Mask:255.255.255.0

iwconfig

iwconfig

wlan0  IEEE 802.11bg  ESSID:"Karen's Wireless Network"  
       Mode:Managed  Frequency:2.437 GHz  Access Point: 00:18:01:FE:AB:AC

Ping (gateway)

ping localhost 127.0.0.1

ping gateway (route -n)

ping 74.125.225.48 (google.com)

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DNS (view records)

Dig well.com (DNS NS + A records no MX records)

ping well.com
traceroute well.com (if installed)

Network Tools (TS Connection)

System -> Administration -> Network Tools

Devices Tab

loopback Interface (lo) 
Protocol IPv4 - 127.0.0.1
Hardware address: Loopback
 
Ethernet Interface (eth0)         
Protocol IPv4  - 192.168.1.x
Hardware address: 00:17:08:5f:dc:73

Wireless Interface (wlan0)         
Protocol IPv4  - 192.168.1.x
Hardware address: 00:17:08:5f:dc:73

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Ping Tab

ping 127.0.0.1

Netstat Tab

Determine gateway 192.168.1.x
ping gateway
ping 74.125.225.48 (google.com)

Lookup Tab - DNS Records

lookup 208.17.81.205 (well.com)
lookup well.com (default information)
lookup well.com (Mailbox Exchange)

Traceroute Tab

traceroute 74.125.225.48 (google.com)
traceroute google.com
traceroute 208.17.81.205 (well.com)
traceroute well.com

Network Manager

System -> Preferences -> Startup Applications
EDIT = nm-applet --sm-disable

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Network Cards

==PCI Adapter==
AZIO AWD154B (802.11G Wireless PCI Adapter)

USB Adapter

Linksys Wireless-G USB Network Adapter with SpeedBooster v2

Dial-Up

  • Whizcoho – DIAL-UP
user = freegeek@whiz.to
pw = test123
Gresham Number: 503-465-4055
503 974-0040

503 647-5957 – support 

http://wiki.freegeek.org/index.php/Dialup_configuration

etc/ppp/pap-secrets
#	*	password
“bbooth76”	*	‘barbwies”

freegeek\@wiz\.to		*	test123
bbooth76\@whiz\.to	*	jlister

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About ssh

Generating a key pair

ssh-keygen -t dsa
http://support.suso.com/supki/SSH_Tutorial_for_Linux

NFS - Network File Sharing (install server)

YouTube-ServerSide

SettingUpNFS

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install nfs-server

sudo apt-get install nfs-kernel-server

Create dir to export (share)

sudo mkdir FolderName (root)
umask = 0022 / permissions = 755
sudo chmod 777 file1

Create local settings such as ...

POSIX permissions (owner and group)

The most restrictive combo of Local and NFS permissions is what applies.

If a folder has full permissions locally (777)
but I export that folder as (ro) instead if (rw), 
My actual permissions are read-only.

Add dir you wish to share to /etc/exports file

cat /etc/exports
sudo nano /etc/exports
(add the following lines)

/dir/FolderName1 192.168.1.7/255.255.255.0(rw,sync)
/dir/FolderName2 x.x.x.x/x.x.x.x(ro,sync)

Export the file system

sudo exportfs -a

Restart the NFS daemon

sudo /etc/init.d/nfs-kernel-server restart

NFS - Network File Sharing (install client)

YouTube-ClientSide

Install client tools for mounting NFS file system

sudo apt-get install nfs-common

Mount network shares with nfs4

sudo mount -t nfs4 -o proto=tcp,port=2049 RemoteHostIP:/dir/ShareName LocalFolder
(LocalFolder on client)

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SAMBA Part 1 of 4

  1. Samba-Part1
  2. Samba-Part2
  3. Samba-Part3
  4. Samba-Part4
SAMBA uses (SMB) "Session Message Block"
SAMBA uses (CIFS) "Common Internet File System"

Install SAMBA

sudo apt-get install samba

Edit the Configuration File

[ALT + F2] then 
gksudo gedit/etc/samba/smb.conf
  
search for "workgroup" workgroup = WORKGROUP
personalized to something like workgroup = sjnWorkgroup

find "security = user" and uncomment

At bottom of Config file create a "share" such as ...

[sjnPUBLIC]
comment = Public files shared on "name of server"!
comment = Public files shared on bob scott (that's server bob and server scott)
path = /sjnPUBLIC
guest ok = yes (can browse without authentication)
browseable = yes
read only = yes
#create mask = 0000
directory mask = 0000

[sjnREADONLY-EXT4]
comment = Read-only share on bob
path = /sjnREADONLY-EXT4
guest ok = yes (can browse without authentication)
browseable = yes
read only = yes
create mask = 0000
directory mask = 0000

[sjnWRITEABLE-EXT4]
comment = Read-Write share on bob
path = /sjnWRITEABLE-EXT4
guest ok = yes (can browse without authentication)
browseable = yes
read only = no
create mask = 7777
directory mask = 7777

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Create dir to match SAMBA shares "Name and Permission"

sudo mkdir -v /sjnPUBLIC 
sudo mkdir -v /sjnREADONLY-EXT4
sudo mkdir -v /sjnWRITEABLE-EXT4

Change file permissions to match the config file

sudo chmod 777 /sjnWRITEABLE-EXT4

SAMBA Part 2 of 4

Samba-Part2

Mount necessary partitions and devices

Mount necessary partitions and devices in /etc/fstab 
(unless they are already mounted)

Not necessary if you are only sharing files on the default ...
Ubuntu Linux ext4 root (/)

Is necessary if you want to auto-mount NTFS partitions to share on network

SAMBA Part 3 of 4

Samba-Part3 

After modifying files in /etc - restart the daemon

Best to create a SAMBA password
sudo useradd sambauser
sudo passwd sambauser
cat /etc/passwd
sudo smbpasswd -a sambauser

Anytime you modify /etc/samba/smb.conf 
sudo restart smbd (unknown?)
sudo start smbd
sudo restart nmbd

SAMBA Part 4 of 4

==Test1 Access the SAMBA server from Ubuntu client==



FSTAB for SAMBA

Editing the FSTAB pt1
Editing the FSTAB pt2
Editing the FSTAB pt3

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FSTAB SHARE configure

see Mount HDD to mount a hard-drive

sudo mount to see what is mounted
sudo mount -a to mount all entries in fstab

gksudo gedit /etc/fstab
select Edit -> Preferences -> Editor
create a backup copy before saving file

Example 1. Share on Linux

[path to share]    [mount point] [file-sys] [options]      	             
//IPAddress/share  /mnt/sjnSAMBA   cifs    users,auto,credentials=/sjnLinuxCredentials.txt, (cont)
  noexec,noperm 0 0

sjnLinuxCredentials.txt file to be owned by root (permissions 400) and contain two lines:
username = samba_user
password = samba user password

Example 2. Share on Windows
[path to share]  [mount point] [file-sys]  [options]            [dump][fsck order]
//win_box/share  /mnt/sjnSAMBA  smbfs      rw,credentials=/sjnWinboxCredentials.txt 0 0
NOTE: add username=share.password= to options list on fstab line

File System Category

#File Systems [auto] [ext4] [jfs] [reiser4] [swap] [iso9660] [FAT 32] [NTFS]
#Note [ntfs-3g]necessary for write access

#Network Types - nfs, smb, cifs

List UUID - Universal Unique Identifier

sudo blkid
ls -l /dev/disk/by-uuid

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Ubuntu Network Configuration Files - Part 1 of 3

config-Part1 config-Part2 config-Part3

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