Public bug reported:
Dear colleagues,
I'm facing the problem in systemd-networkd with processing classless
routes (in fact, I'm using netplan, but netplan use networkd).
Environment is below.
The problem:
DHCP server sends the following classless routes in Opt.121 (in the following
sequence):
3.3.3.0/24 -> 10.0.3.14
10.0.3.0/24 -> 0.0.0.0
and systemd-networkd fails with the message:
Apr 11 11:11:40 mother systemd-networkd[8357]: eth1: DHCPv4 address 10.0.2.15/24
Apr 11 11:11:40 mother systemd-networkd[8357]: eth1: DHCP: No routes received
from DHCP server: No data available
Apr 11 11:11:40 mother systemd-networkd[8357]: eth1: Could not set DHCPv4
route: Network is unreachable
Apr 11 11:11:40 mother systemd-networkd[8357]: eth1: Failed
The cause is clear - at the moment when 3.3.3.0/24 appears, there is no
route to it's nexthop (10.0.3.14).
Default behavior of ISC DHCP client is the same but can be fixed in two
ways:
1) second run of dhclient installs 3.3.3.0/24 since 10.0.3.14 is accessible
since first run
2) OR changing /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes in
order to process connected routes (i.e. gateway is 0.0.0.0) first, while other
routes - next.
Is it possible to modify systemd-networkd behavior in some way? -
1) sort routes and install connected first and other - next?
2) OR use kind of max_retries after which systemd-networkd's dhcp client will
fail finally
3) OR add ability to use own scripts like mentioned above ISC's hook?
Any recommendation on how to work around this issue are highly
appreciated.
Thank you.
Environment:
OS: Ubuntu 18.04.2
systemd: 237
DNS server: dnsmasq (Openstack)
Netplan: 0.40.1~18.04.4
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1824340
Title:
DHCPv4 can't set route
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