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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
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
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.
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)
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
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
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
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)
install nfs-server
sudo apt-get install nfs-kernel-server
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.
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)
Install client tools for mounting NFS file system
sudo apt-get install nfs-common
sudo mount -t nfs4 -o proto=tcp,port=2049 RemoteHostIP:/dir/ShareName LocalFolder (LocalFolder on client)
SAMBA Part 1 of 4
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
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
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 pt1 Editing the FSTAB pt2 Editing the FSTAB pt3
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
[device] [mount point] [file-sys] [options] //IPAddress/share /mnt/sjnSAMBA cifs users,auto,credentials=/credentials.txt, (cont) noexec,noperm o o
NOTE: A credentials file should be owned by root (permissions 400) and contain two lines: username = samba_user password = samba user password
Example 2. new-school [device] [mount point] [file system] [options] [dump][fsck order] UUID=34C4DFF9C4DF8876 /media/sjnDevice ntfs-3g defaults,locale=en_US.utf8 0 0
#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