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