I have an AM335x based IOT system where the CPU can initially boot over
its USB interface using RDNIS and TCPIP/DHCP/TFTP. I need to run a DHCP
server on a Fedora33 host to support the DHCP requests from this CPU. In
this scenario the CPU brings its USB RDNIS interface up and down about 3
times.
In a old Fedora system (probably Fedora 23) this worked fine, however I
am trying to update our boot system to run on Fedora33 and am having
problems with the DHCP server. It has a basic /etc/dhcp/dhcpd.conf file
that I have used before that dishes out IP addresses for the subnet
10.0.0.0 netmask 255.255.255.0 (as below). I have configured a usb0
interface with NetworkManager that uses a static IP address of 10.0.0.1.
I am having two problems:
1. If you try and start the DHCP server when the usb0 interface is down
(not connected or CPU not driving a RDNIS interface) then the dhcpd
server will not start with the error message "Not configured to listen
on any interfaces!".
2. If the usb0 interface is up, the dhcp server runs and serves an IP
address to the AM335x fine, but then the AM335x close and opens the USB0
interface and I see the error message "receive_packet failed on usb0:
Network is down" and the dhcp server no longer replies to requests on
the newly come up usb0 interface.
I am guessing that at some time the dhcp server was changed to listen on
specific network interfaces only rather than a standard host socket
listening on all networks and that it does not try to reconnect to a
network interface once that has gone down.
Does anyone know of a configuration option to get the dhcp server to
listen on all network interfaces in a general way or to retry its
network connection when the interface goes down and up ?
Or do I have to get NetworkManager to stop/start the DHCP server for
this particular usb0 network interface (yuck!) ?
Terry
/etc/dhcp/dhcpd.conf
subnet 10.0.0.0 netmask 255.255.255.0 {
default-lease-time 1209600; # Two weeks
max-lease-time 31557600; # One year
range dynamic-bootp 10.0.0.128 10.0.0.250;
option subnet-mask 255.255.255.0;
option domain-name "usbnet";
option nis-domain "usbnet";
option nis-servers 10.0.0.1;
option domain-name-servers 10.0.0.1;
option ntp-servers 10.0.0.1;
next-server 10.0.0.1;
use-host-decl-names on;
allow bootp;
allow booting;
if substring (option vendor-class-identifier, 0, 10) = "AM335x ROM" {
filename "vlim/u-boot-spl.bin";
}
elsif substring (option vendor-class-identifier, 0, 10) = "DM814x
ROM" {
filename "vlim/u-boot-spl.bin";
}
elsif substring (option vendor-class-identifier, 0, 17) = "AM335x
U-Boot SPL" {
filename "vlim/u-boot.img";
}
else {
filename "uImage";
}
}
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