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VictorLee
Asked: 2021-06-30 06:41:11 +0800 CST

isc-dhcp-server can't get DHCPDISCOVER packet from some clients whose MAC address not in the subnet

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isc-dhcp-server running normal, it can offer IP address to most clients in all subnet which are defined in the dhcpd.conf file, but it can't receive some DHCPDISCOVER packet from several clients which also in the same define subnet without the static MAC address config.

Some segment of dhcpd.conf:

subnet 10.10.10.0 netmask 255.255.255.0 {
        option routers 10.10.10.1;
        next-server 10.10.10.100;
        filename "pxelinux.0";
        host 10-10-10-72 {hardware ethernet     BB:BB:BB:BB:BB:BF;fixed-address 10.10.10.72;}
        host 10-10-10-73 {hardware ethernet     BB:BB:BB:BB:BB:B0;fixed-address 10.10.10.73;}}

FYI. All subnet config are static define, the clients which can't send DHCPDISCOVER to isc-dhcp-server owns MAC address are not included the dhcpd.conf.

/var/log/message the default dhcp server's log can't get the DHCPDISCOVER request log.

After add the new MAC address's config to dhcpd.conf, then restart isc-dhcp-server, it works for all clients.

What is the base principle of isc-dhcp-server?

Maybe there are not define the MAC address configure of the request client in the dhcpd.conf file?

Or there are not exist the dynamic address range in the subnet config?

dhcp isc-dhcp

0 Answers