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Ifstated
# Ifstated ## Fast detection of wrong IP My Vodafone Cable Router often assigns wrong (private) IPs to my upstream interface via DHCP. Using `ifstated` we can detect this change and trigger a new DHCP request as long as the wrong IP gets assigned. ``` cat <<"EOF"> /etc/ifstated.conf wrong_ip = '( "ifconfig em0 | grep -q 192.168." every 20 )' state dhcp { init { run "logger -p daemon.info -t ifstated entering state dhcp" } if $wrong_ip { run "logger -p daemon.info -t ifstated detected wrong ip state dhcp" run "sh /etc/netstart em0" } if ! $wrong_ip { run "logger -p daemon.info -t ifstated detected correct ip state dhcp" } } EOF ``` ``` rcctl enable ifstated rcctl start ifstated ```