systemd dhcp don't work on vlan

[Roman]

root@gwd:~# uname -a
Linux gwd 4.15.0-50-generic #54-Ubuntu SMP Mon May 6 18:46:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

root@gwd:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic

root@gwd:~# cat /etc/systemd/network/enp3s0.network
[Match]
Name=enp3s0

[Link]
MACAddress=C8:D3:A3:50:02:33

[Network]
VLAN=enp3s0.2

root@gwd:~# cat /etc/systemd/network/enp3s0.2.netdev
[NetDev]
Name=enp3s0.2
Kind=vlan

[VLAN]
Id=2

root@gwd:~# cat /etc/systemd/network/enp3s0.2.network
[Match]
Name=enp3s0.2

[Network]
DHCP=ipv4

[DHCP]
UseRoutes=true

-----------------------------
No ip on enp3s0.2 after boot!
dhclient enp3s0.2 works fine, i create systemd service for it as temporary workaround

[Roman (krey81)]

netplan and cloud-init not used and was purged

[Roman (krey81)]

on same machine usb modem works fine with DHCP option

root@gwd:~# cat /etc/systemd/network/yota.network
[Match]
Name=enx0c5b8f279a64

[Network]
DHCP=yes

[Dimitri John Ledkov (xnox)]

How does your vlan .netdev unit looks like?

You need something that creates the vlan device on top of the selected underlying device, ie.:

$ cat enp3s0.2.netdev
[NetDev]
Name=enp3s0.2
Kind=vlan

[VLAN]
Id=2

Without that, there won't be vlan device created (nor visiable in $ ip a), and thus no network on it either.

[Roman (krey81)]

root@gwd:~# cat /etc/systemd/network/enp3s0.2.netdev
[NetDev]
Name=enp3s0.2
Kind=vlan

[VLAN]
Id=2

[Roman (krey81)]

I wrote earlier that the dhclient works fine on this interface, so the problem is apparently that dhcp does not work as requested for the vlan network

[Dimitri John Ledkov (xnox)]

Please attach output from networkd on boot prior to / without the extra dhclient unit if you can.

$ networkctl | pastebinit

$ journalctl -b -u systemd-networkd | pastebinit

[Roman (krey81)]

make it through crontab and redirect output

root@gwd:~# cat /root/networkctl
IDX LINK TYPE OPERATIONAL SETUP
  1 lo loopback carrier unmanaged
  2 enp2s0 ether carrier configured
  3 enp3s0 ether degraded configured
  4 wg0 none routable configured
  5 br-mgmt ether routable configured
  6 br-lan ether no-carrier configuring
  7 enp3s0.2 ether degraded configuring

7 links listed.

root@gwd:~# cat /root/journal-systemd
-- Logs begin at Sun 2018-01-28 18:58:18 MSK, end at Tue 2019-06-04 16:06:01 MSK. --
Jun 04 16:02:15 gwd systemd[1]: Starting Network Service...
Jun 04 16:02:15 gwd systemd-networkd[635]: br-lan: netdev ready
Jun 04 16:02:15 gwd systemd-networkd[635]: br-mgmt: netdev ready
Jun 04 16:02:15 gwd systemd-networkd[635]: wg0: netdev ready
Jun 04 16:02:15 gwd systemd-networkd[635]: Enumeration completed
Jun 04 16:02:15 gwd systemd[1]: Started Network Service.
Jun 04 16:02:15 gwd systemd-networkd[635]: enp2s0: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: br-mgmt: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: lo: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: br-lan: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: wg0: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: br-mgmt: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: lo: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: br-lan: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: wg0: Link is not managed by us
Jun 04 16:02:15 gwd systemd-networkd[635]: enp3s0.2: netdev ready
Jun 04 16:02:15 gwd systemd-networkd[635]: enp3s0: IPv6 successfully enabled
Jun 04 16:02:15 gwd systemd-networkd[635]: enp2s0: IPv6 successfully disabled
Jun 04 16:02:18 gwd systemd-networkd[635]: enp3s0: Gained carrier
Jun 04 16:02:18 gwd systemd-networkd[635]: enp3s0.2: Gained carrier
Jun 04 16:02:18 gwd systemd-networkd[635]: br-lan: IPv6 successfully enabled
Jun 04 16:02:18 gwd systemd-networkd[635]: br-mgmt: IPv6 successfully enabled
Jun 04 16:02:18 gwd systemd-networkd[635]: wg0: IPv6 successfully disabled
Jun 04 16:02:18 gwd systemd-networkd[635]: wg0: Gained carrier
Jun 04 16:02:18 gwd systemd-networkd[635]: wg0: Configured
Jun 04 16:02:18 gwd systemd-networkd[635]: lo: Link is not managed by us
Jun 04 16:02:19 gwd systemd-networkd[635]: enp2s0: Gained carrier
Jun 04 16:02:19 gwd systemd-networkd[635]: enp2s0: Configured
Jun 04 16:02:19 gwd systemd-networkd[635]: br-mgmt: Gained carrier
Jun 04 16:02:20 gwd systemd-networkd[635]: enp3s0: Gained IPv6LL
Jun 04 16:02:20 gwd systemd-networkd[635]: enp3s0: Configured
Jun 04 16:02:20 gwd systemd-networkd[635]: enp3s0.2: Gained IPv6LL
Jun 04 16:02:20 gwd systemd-networkd[635]: br-mgmt: Gained IPv6LL
Jun 04 16:02:20 gwd systemd-networkd[635]: br-mgmt: Configured

[Dimitri John Ledkov (xnox)]

Is that the full networkd config?

Slightly confused why enp3s0 is degraded. Does it have a cable plugged in?

Could you tar up and share /run/systemd/netif ?

Does adding below

[DHCP]
ClientIdentifier=mac

to the enp3s0.2.network help?

[Roman (krey81)]

yes full config. Many cables unplugged because router not fully functional
enp3s0 connected to swithch in Tagged port, configured only with Vlan 2.
ClientIdentifier=mac not helped

my problem looks similar to https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1779721

[Roman (krey81)]

here is lease gained from dhclient
dhcp-lease-time present

lease {
  interface "enp3s0.2";
  fixed-address 213.141.128.50;
  option subnet-mask 255.255.224.0;
  option routers 213.141.159.252;
  option dhcp-lease-time 7200;
  option dhcp-message-type 5;
  option domain-name-servers 212.1.224.6,212.1.244.6;
  option dhcp-server-identifier 212.1.254.199;
  option vendor-encapsulated-options "http://acs.netbynet.ru";
  renew 2 2019/06/04 16:09:10;
  rebind 2 2019/06/04 17:06:44;
  expire 2 2019/06/04 17:21:44;
}

[Roman (krey81)]

here is debug log
http://paste.ubuntu.com/p/mTxRb5s4Qc/

[Roman (krey81)]

netif.tar http://paste.ubuntu.com/p/DvPcmNs6Jb/

[Roman (krey81)]

here is two tcpdumps of dhcp ports

root@gwd:~# tcpdump -vv -i enp3s0 -n port 67 and port 68
tcpdump: listening on enp3s0, link-type EN10MB (Ethernet), capture size 262144 bytes

SYSTEMD [NOT WORKED]
19:58:01.261864 IP (tos 0xc0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 300)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from c8:d3:a3:50:02:33, length 272, xid 0x495060a3, secs 1539, Flags [none] (0x0000)
          Client-Ethernet-Address c8:d3:a3:50:02:33
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Discover
            Client-ID Option 61, length 7: ether c8:d3:a3:50:02:33
            Parameter-Request Option 55, length 8:
              Subnet-Mask, Default-Gateway, Hostname, Domain-Name
              Domain-Name-Server, MTU, Static-Route, Classless-Static-Route
            MSZ Option 57, length 2: 576
            Hostname Option 12, length 3: "gwd"

DHCLIENT [WORKED]
20:02:33.187353 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from c8:d3:a3:50:02:33, length 300, xid 0x5986fc7c, Flags [none] (0x0000)
          Client-Ethernet-Address c8:d3:a3:50:02:33
          Vendor-rfc1048 Extensions
            Magic Cookie 0x63825363
            DHCP-Message Option 53, length 1: Request
            Requested-IP Option 50, length 4: 213.141.128.50
            Hostname Option 12, length 3: "gwd"
            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

[Roman (krey81)]

ok. bug may be closed, i locate problem.

dhcp don't get lease on discovery if where is a valid lease. After release current lease systemd dhcp discover request was answered.