Send dhcp-users mailing list submissions to
dhcp-users@lists.isc.org
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.isc.org/mailman/listinfo/dhcp-users
or, via email, send a message with subject or body 'help' to
dhcp-users-requ...@lists.isc.org
You can reach the person managing the list at
dhcp-users-ow...@lists.isc.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of dhcp-users digest..."
Today's Topics:
1. dhcpd does not answer DHCPDISCOVER from systemd-networkd
(Frederik Himpe)
----------------------------------------------------------------------
Message: 1
Date: Tue, 25 Feb 2020 10:40:30 +0100
From: Frederik Himpe <frede...@frehi.be>
To: dhcp-users@lists.isc.org
Subject: dhcpd does not answer DHCPDISCOVER from systemd-networkd
Message-ID: <8cba680ea96c65447b02a310c663733809f746be.ca...@frehi.be>
Content-Type: text/plain; charset="UTF-8"
I have a Debian Buster server running dhcpd version 4.4.1-2 an a client
with Ubuntu 18.04. When I use systemd-netword to get an IP using DHCP,
the server does not answer the DHCPDISCOVER. However, when I run
dhclient instead, dhcpd does answer the DHCPDISCOVER. Also PXE booting
works.
The server logs this when using systemd-networkd:
dhcpd[1227]: DHCPDISCOVER from 04:0e:3c:a3:b2:79 via eth0: network AI: no free
leases
With dhclient it says:
dhcpd[1227]: DHCPDISCOVER from 04:0e:3c:a3:b2:79 (aiexp1) via eth0
dhcpd[1227]: DHCPOFFER on 192.168.0.20 to 04:0e:3c:a3:b2:79 (aiexp1) via eth0
dhcpd[1227]: DHCPREQUEST for 192.168.0.20 (192.168.0.1) from 04:0e:3c:a3:b2:79
(aiexp1) via eth0
dhcpd[1227]: DHCPACK on 192.168.0.120 to 04:0e:3c:a3:b2:79 (aiexp1) via eth0
dhcpd.conf roughly looks like this:
shared-network "AI" {
subnet 192.168.0.0 netmask 255.255.255.0 {
authoritative;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.0.255;
option routers 192.168.0.1;
pool {
allow members of "AI";
range 192.168.0.10 192.168.0.50;
}
pool {
allow members of "BI";
range 192.168.0.100 192.168.0.150
}
}
subnet 192.168.1.0 netmask 255.255.255.0 {
[...]
}
group {
allow bootp;
next-server 192.168.0.2;
if option arch = 00:07 {
filename "fai/efi/x86_64-efi/core.efi";
} else {
filename "fai/pxelinux.0";
}
host aiexp1 {
hardware ethernet 04:0E:3C:A3:B2:79;
}
}
}
subclass "AI" 1:04:0e:3c:a3:b2:79;
tcpdump on the server while using systemd-networkd as client:
15:43:51.989154 IP (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP
(17), length 316)
0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request
from 04:0e:3c:a3:b2:79 (oui Unknown), length 288, xid 0x488b21d8, secs 1, Flags
[none] (0x0000)
Client-Ethernet-Address 04:0e:3c:a3:b2:79 (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Client-ID Option 61, length 19: hardware-type 255,
b6:22:0f:eb:00:02:00:00:ab:11:f0:a4:5a:73:5e:e8:d2:07
Parameter-Request Option 55, length 9:
Subnet-Mask, Default-Gateway, Hostname, Domain-Name
Domain-Name-Server, MTU, Static-Route, Classless-Static-Route
NTP
MSZ Option 57, length 2: 576
Hostname Option 12, length 6: "aiexp1"
END Option 255, length 0
While using dhclient:
15:56:27.094705 IP (tos 0x0, ttl 128, id 0, offset 0, flags [none], proto UDP
(17), length 328)
0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP, Request
from 04:0e:3c:a3:b2:79 (oui Unknown), length 300, xid 0xdce3353c, secs 8, Flags
[none] (0x0000)
Client-Ethernet-Address 04:0e:3c:a3:b2:79 (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Hostname Option 12, length 6: "aiexp1"
Parameter-Request Option 55, length 13:
Subnet-Mask, BR, Time-Zone, Default-Gateway
Domain-Name, Domain-Name-Server, Option 119, Hostname
Netbios-Name-Server, Netbios-Scope, MTU, Classless-Static-Route
NTP
END Option 255, length 0
PAD Option 0, length 0, occurs 33
15:56:28.096165 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP
(17), length 329)
dhcp.example.com.bootps > ai20.example.com.bootpc: [udp sum ok] BOOTP/DHCP,
Reply, length 301, xid 0xdce3353c, secs 8, Flags [none] (0x0000)
Your-IP ai20.example.com
Server-IP ai02.example.com
Client-Ethernet-Address 04:0e:3c:a3:b2:79 (oui Unknown)
file "fai/pxelinux.0"
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Offer
Server-ID Option 54, length 4: dhcp.example.com
Lease-Time Option 51, length 4: 2941
Subnet-Mask Option 1, length 4: 255.255.255.0
BR Option 28, length 4: 192.168.0.255
Default-Gateway Option 3, length 4: 192.168.0.1
Domain-Name Option 15, length 9: "example.com"
Domain-Name-Server Option 6, length 8:
ns1.example.com,ns2.example.com
Netbios-Name-Server Option 44, length 4: file.example.com
END Option 255, length 0
How can I make dhcpd answer the systemd-networkd DHCPDISCOVER request too?
--
Frederik Himpe <frede...@frehi.be>
------------------------------
Subject: Digest Footer
_______________________________________________
dhcp-users mailing list
dhcp-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
End of dhcp-users Digest, Vol 136, Issue 10
*******************************************
