Revision as of 17:25, 6 November 2011

   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

top

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.

top

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)

top

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

top

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

top

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

top

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

top

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)

top

SAMBA Part 1 of 4

Samba-Part1

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

top

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

FSTAB for SAMBA

Editing the FSTAB

top

FSTAB configure

mount to see what is mounted
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. old-school
<file system> <mount point>     <type>   <options>      	     <dump> <pass>
/dev/sdb1     /media/sjnDevice  ntfs-3g  defaults,locale=en_US.utf8   0      0

Example 2. new-school
<file system>         <mount point>     <type>   <options>      	     <dump> <pass>
UUID=34C4DFF9C4DF8876 /media/sjnDevice  ntfs-3g  defaults,locale=en_US.utf8   0      0

List UUID - Universal Unique Identifier

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

top

Ubuntu Network Configuration Files - Part 1 of 3

config-Part1 config-Part2 config-Part3

@@ Line 215: / Line 215: @@
 [[#top|top]]
-=SAMBA - Configuring in Ubuntu=
+=SAMBA Part 1 of 4=
-==Part 1 of 4==
 [http://www.youtube.com/watch?v=Bo9HOadl-YM&feature=related Samba-Part1]
@@ Line 222: / Line 221: @@
   SAMBA uses (CIFS) "Common Internet File System"
-===Install SAMBA===
+==Install SAMBA==
   sudo apt-get install samba
-===Edit the Configuration File===
+==Edit the Configuration File==
   [ALT + F2] then
   gksudo gedit/etc/samba/smb.conf
@@ Line 266: / Line 265: @@
 [[#top|top]]
-===Create dir to match SAMBA shares "Name and Permission"===
+==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===
+==Change file permissions to match the config file==
   sudo chmod 777 /sjnWRITEABLE-EXT4
-==Part 2 of 4==
+=SAMBA Part 2 of 4=
 [http://www.youtube.com/watch?v=LdlxPB2PCvg&feature=related Samba-Part2]
-===Mount necessary partitions and devices===
+==Mount necessary partitions and devices==
   Mount necessary partitions and devices in /etc/fstab
   (unless they are already mounted)
@@ Line 286: / Line 285: @@
   Is necessary if you want to auto-mount NTFS partitions to share on network
-==Editing the FSTAB for SAMBA==
+=FSTAB for SAMBA=
   [http://www.youtube.com/watch?v=EXv_N1atY50&feature=related Editing the FSTAB]
 [[#top|top]]
-===FSTAB configure===
+==FSTAB configure==
   mount to see what is mounted
   mount -a to mount all entries in fstab
@@ Line 300: / Line 299: @@
   Example 1. old-school
   <file system> <mount point>     <type>   <options>      	     <dump> <pass>
   /dev/sdb1     /media/sjnDevice  ntfs-3g  defaults,locale=en_US.utf8   0      0
   Example 2. new-school
- sudo blkid (get UUID = Universal Unique Identifier)
   <file system>         <mount point>     <type>   <options>      	     <dump> <pass>
   UUID=34C4DFF9C4DF8876 /media/sjnDevice  ntfs-3g  defaults,locale=en_US.utf8   0      0
+==List UUID - Universal Unique Identifier==
+ sudo blkid
+ ls -l /dev/disk/by-uuid
   [[#top|top]]
+= =
 =Ubuntu Network Configuration Files - Part 1 of 3=

Difference between revisions of "User:Scott/04"

Revision as of 17:25, 6 November 2011

DHCP syn ak

Open Ports (view)

TCP/IP Open Connection

DNS (view records)

Reset Modem and Router

BASH Shell (TS connection)

Adapter or Onboard

lspci

lsusb

DHCP

DHCP Discover

ifconfig

iwconfig

Ping (gateway)

DNS (view records)

Network Tools (TS Connection)

Devices Tab

Ping Tab

Netstat Tab

Lookup Tab - DNS Records

Traceroute Tab

Network Manager

Network Cards

USB Adapter

Dial-Up

About ssh

Generating a key pair

NFS - Network File Sharing (install server)

install nfs-server

Create dir to export (share)

Create local settings such as ...

POSIX permissions (owner and group)

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

Export the file system

Restart the NFS daemon

NFS - Network File Sharing (install client)

Install client tools for mounting NFS file system

Mount network shares with nfs4

SAMBA Part 1 of 4

Install SAMBA

Edit the Configuration File

Create dir to match SAMBA shares "Name and Permission"

Change file permissions to match the config file

SAMBA Part 2 of 4

Mount necessary partitions and devices

FSTAB for SAMBA

FSTAB configure

List UUID - Universal Unique Identifier

Ubuntu Network Configuration Files - Part 1 of 3

Navigation menu

Search