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 ...

Ports used by DHCP (Dynamic Host Configuration Protocol). Port Protocol Description 67 UDP Bootstrap Protocol (BOOTP) Server; also used by Dynamic Host Configuration Protocol (DHCP) 68 UDP Bootstrap Protocol (BOOTP) Client; also used by Dynamic Host Configuration Protocol (DHCP) 546 TCP/UDP DHCPv6 client 547 TCP/UDP DHCPv6 server 647 TCP DHCP Failover protocol 847 TCP DHCP Failover 2

This errors out, but will remove an assigned IP address anyway: $ sudo ifconfig eth0 0.0.0.0 netmask 0.0.0.0 if...

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 ....

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...

On windows, display IPv4 routing table: route -4 print On Linux: $ route Kernel IP routing table Destination ... This works for both Linux and Windows (" -r ": display routing table, " -n ": display address and port numbers in numerical form): netstat -rn

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

/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...

Windows command line shell does not come with a sleep command. One trick is to emulate sleep using the ping command: C:\>ping /? Usage: ping [-t] [-a] [-n count... To sleep for about 5 seconds: @rem make sure to ping a non-existing IP, otherwis... If you have the Windows Resource Kit installed, it does provide a sleep command: C:\>sleep Usage: sleep time-to-sleep-in-s...