= CSLab Networking =

DHCP Servers: 
* danaos (subnet 147.102.3)
* scirouter (subnet 147.102.4) 

Useful commands:
* `# view /etc/dhcpd.conf`: see and set statically assigned IPs (dhcp runs only on danaos, not on scirouter)

* `# /usr/local/share/munin/dhcpstatus/dhcpstatus_0.60/scripts/dhcpstatus`: Returns the DHCP status (@ danaos), see the number of available IPs

* `# nmap -sP 147.102.4.190/26`: See who is connected to the subnet

* `/etc/init.d/dhcp3-server status`: To see the status of the dhcp server ("restart" to restart it)

==== Allocate a static IP ====

* At `/etc/network/interface` add (under correct interface):

{{{
	IP	147.102.4.149
	Broadcast 147.102.4.191
	Gateway	147.102.4.190
	Netmask	255.255.255.192
}}}

Add the MAC address and IP at `dhcpd.conf` as above

==== Add the domain name to DNS server ====

`# vim /etc/bind/cslab.ece.ntua.gr.zone`: Find the ip and change the name on top Add entry and update serial on top of file

==== Reverse lookup ====

* `# vim 4.102.147.in-addr.arpa.zone` Find the ip and change the name on top 
* Add entry and update serial on top of file
* `# rndc reload`
* To test: `# nslookup 147.102.4.149`
* If something is added, e.g. URL: `# service bind9 restart`