DHCPd
Quick start
Nothing fancy, just use this config as a start and you should be able to get it up and running in 5minutes.#
# DHCP Server Configuration file.
# see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
default-lease-time 600;
max-lease-time 7200;
ddns-update-style ad-hoc;
option subnet-mask 255.255.255.0;
option broadcast-address 172.16.181.255;
option routers 172.16.181.1;
option domain-name-servers 172.16.18.1;
option domain-name "mydomain.org";
subnet 172.16.181.0 netmask 255.255.255.0 {
range 172.16.181.200 172.16.181.250;
}Binding DHCPd to an interface
If you want DHCPd to bind to a certain interface, edit /etc/sysconfig/dhcpd and setDHCPDARGS=eth1
DHCP and DNS
This is untested. Basically when an IP is assigned, it will update DNS.authoritative;
ddns-update-style interim;
ignore client-updates;
key DHCP_UPDATER {
algorithm HMAC-MD5;
secret xxyy;
};
zone domain.com. {
primary 127.0.0.1;
key DHCP_UPDATER;
}
zone 1.168.192.in-addr.arpa. {
primary 127.0.0.1;
key DHCP_UPDATER;
}Filtering dhcp log with syslog-ng
Configure dhcpd to log to local7, then edit syslog-ng.conf:# Add destination and filter.
destination df_dhcpd { file("/var/log/dhcpd.log"); };
filter f_dhcpd { match("dhcpd"); };
# Modify /var/log/messages to exclude dhcpd logs
filter f_messages {
level(info,notice,warn)
and not facility(auth,authpriv,cron,daemon,mail,news)
and not match("dhcpd");
};
# Finally define dhcpd log
log {
source(s_all);
filter(f_dhcpd);
destination(df_dhcpd);
};And remember to configure logrotate to rotate dhcpd.log
logrotate.d/syslog-ng
/var/log/dhcpd.log {
rotate 4
missingok
notifempty
weekly
compress
}
rotate 4
missingok
notifempty
weekly
compress
}
Yea.. sometimes Linux stuff can be overly complicated.
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