Thread: Security for static adresses from network

i configured dhcpd

code:

# ddns-updates-style parameter controls whether or not server  # attempt dns update when lease confirmed. default  # behavior of version 2 packages ('none', since dhcp v2 didn't  # have support ddns.)  ddns-update-style none;  # option definitions common supported networks...  option domain-name "xxxx.com";  option domain-name-servers xxx.xxx.xxx.xxx, xxx.xxx.xxx.xxx;  default-lease-time 600;  max-lease-time 7200;  # if dhcp server official dhcp server local  # network, authoritative directive should uncommented.  authoritative;    # use send dhcp log messages different log file (you  # have hack syslog.conf complete redirection).  log-facility local7;    # no service given on subnet, declaring helps the.  # dhcp server understand network topology.    subnet 172.22.22.0 netmask 255.255.255.0 {  }

when connect pc automatic condifuration ok: pc don't adress. when set configuration on pc manually 172.22.22.10 , set gateway , dns , plug ubuntu pc has internet connection.
there way denied such action local network?

hey !

dhcp in charge of providing configuration hosts not statically configured. per say, take off network after it's job done; has nothing routing things or deciding who's allowed talk.

if want control who's allowed use network, weither address commes dhcp or not irrelevant. want setup firewall.

quick explanation :
https://help.ubuntu.com/8.04/serverguide/firewall.html

personnaly prefer iptables :
https://help.ubuntu.com/community/iptableshowto

absolute beginner or simple systems, there "firestarter" gui , has advantage of listing of blocks (so know why stopped working...)

there software called "firewall builder" in repos. it's nice graphical way build iptables scripts.

have fun

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