Notes by woolf
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Created by woolf on July 30, 2011 13:03:48
Last update: October 24, 2011 07:52:42
Contrary to the DD-WRT router database , the Belkin F5D7231-4 v2000 cannot be flashed with TFTP . When I followed the TFTP procedures, I always got TTL=64 , never TTL=100 or TTL=128 , which is supposed to indicate that the router TFTPd is ready. I got network timeout when I tried to send the bin file anyway. The right way to flash the Belkin F5D7231-4 v2000 is to use the binary and Sercomm Utility provided by eko. Simply: Put the router in upgrade mode: unplug router, press reset button and keep it pressed while plugging in the power. Release it when lan leds turn off. Power and Connected led must blink . start the Sercomm Utility select the network interface connected to the router select...
Created by woolf on September 21, 2011 16:23:06
Last update: September 21, 2011 16:24:29
VirtualBox creates/uses a network adapter named vboxnet0 on the host, when a VM network adapter is connected as "host-only". As the VM starts, VirtualBox assigns the IP address 192.168.56.1 to vboxnet0 on the host. The VM DHCP client grabs the IP address 192.168.56.101 from the VirtualBox DHCP server. Connectivity is limited between the VM and the host - unless you configure NAT and IP forwarding on the host.
For OpenWRT, if the DHCP client is not started automatically:
#/sbin/udhcpc -i br-lan -p /var/run/udhcpc.pid -s ...
Created by woolf on July 29, 2011 08:34:34
Last update: July 29, 2011 08:34:34
This errors out, but will remove an assigned IP address anyway:
$ sudo ifconfig eth0 0.0.0.0 netmask 0.0.0.0
if...
Created by woolf on July 27, 2011 20:56:11
Last update: July 27, 2011 20:56:11
Install the DHCP server:
voodoo@newpc:~$ sudo apt-get install dhcp3-server
...
Edit /etc/dhcp/dhcpd.conf (this is the minimum for a local network without DNS):
ddns-update-style none;
default-lease-time ...
Start the DHCP server:
voodoo@newpc:/etc/dhcp$ sudo /etc/init.d/isc-dhcp-...
Created by woolf on July 19, 2011 20:39:56
Last update: July 19, 2011 20:39:56
This is deprecated:
$ sudo /etc/init.d/networking start
Use:
$ sudo service networking start
or
$ sudo service networking restart
or
$ sudo start networking
Created by woolf on July 05, 2011 16:03:48
Last update: July 05, 2011 16:03:48
The DHCP client packaged with BusyBox is udhcpc . It negotiates a lease with the DHCP server and executes a script when it is obtained or lost. There are four possible arguments to this script: deconfig : The script should put the interface in an up but deconfigured state. bound : The script should configure the interface and set any other relevant parameters. renew : This is used when a lease is renewed. IP address does not change but other parameters may change. nak : This happens when a NAK packet is received from the DHCP server. Network parameters are passed to the script via environment variables. Ubuntu documents that the default script is at /etc/udhcpc/default.script . For OpenWRT, it is located at /usr/share/udhcpc/default.script ....
Created by woolf on July 05, 2011 15:38:52
Last update: July 05, 2011 15:39:55
By default VirtualBox enables one network adapter ("Adapter 1") with NAT. Connection from the guest OS to the outside world works natually when the guest network adapter is assigned an IP address by the VirtualBox DHCP server. Use VBoxManage to see a list of DHCP servers:
$ VBoxManage list dhcpservers NetworkName: H... The guest IP address is not visible from the outside world. If you need to access a server on the guest OS, you need to set up port forwarding in VirtualBox settings: Settings -> Network -> Adapter 1 -> Advanced -> Port Forwarding . Beware that on Linux/Unix, port forwarding may not work if you bind to a privileged port (port number < 1024) but you are not root. Bridged networking can be...
Created by woolf on May 15, 2011 14:35:58
Last update: May 15, 2011 14:36:47
Assign IP adrress and network mask:
sudo ifconfig eth0 192.168.183.5 netmask 255.255.2...
Add default gateway:
sudo route add default gw 192.168.183.2
Add name server: " sudo vi /etc/resolv.conf " and add:
nameserver 192.168.183.2
Created by woolf on May 15, 2011 14:18:54
Last update: May 15, 2011 14:19:49
/etc/resolve.conf : DNS server configuration.
Example:
search localdomain
nameserver 192.168.183.2
/etc/hosts : map hostname to IP address locally instead of using DNS, often take precedence over DNS.
Example:
127.0.0.1 localhost
127.0.1.1 myserver
#...
/etc/nsswitch.conf : system databases and Name Service Switch configuration file.
Example:
# /etc/nsswitch.conf
#
# Example configurati...
/etc/sysconfig/network (for Fedora, Redhat, CentOS): specify network configuration - static IP, DHCP, NIS, etc.
/etc/network/interfaces (for Ubuntu): specify network configuration - static IP, DHCP, NIS, etc.
Example:
auto lo
iface lo inet loopback
auto eth0...
