** Description changed:
- requesting backport of PR https://github.com/systemd/systemd/pull/14983 which
fixes the issue described in
+ [impact]
+
+ the networkd UseRoutes parameter allowed ignoring all routes provided by
+ a dhcp4 server, including the route via the dhcp4-provided gateway.
+ This was the behavior of networkd until recently, and in Focal the
+ UseRoutes parameter does *not* prevent networkd from adding the route
+ via the dhcp4-provided gateway. This is now controlled with a new
+ parameter, UseGateway.
+
+ The systemd in Focal unfortunately has part of the upstream code; it no
+ longer ignores the gateway route when UseRoutes=false is specified, but
+ also it does not include the UseGateway parameter.
+
+ [test case]
+
+ bug 1872589 has a good test case netplan config, but a very quick test
+ can be done with the networkd config:
+
+ [Match]
+ Name=eth0
+
+ [Network]
+ DHCP=ipv4
+ LinkLocalAddressing=ipv6
+
+ [DHCP]
+ RouteMetric=100
+ UseMTU=true
+ UseRoutes=false
+
+
+ this results in the system incorrectly setting a route via the default
gateway:
+
+ root@lp1867375-f:~# ip r
+ default via 10.202.51.1 dev eth0 proto dhcp src 10.202.51.86 metric 100
+ 10.202.51.0/24 dev eth0 proto kernel scope link src 10.202.51.86
+ 10.202.51.1 dev eth0 proto dhcp scope link src 10.202.51.86 metric 100
+
+ [regression potential]
+
+ tbd
+
+ [other info]
+
+ to properly support separation of 'routes' and 'gateways' received via
+ dhcp4, SRU releases should also support the UseGateway parameter, which
+ is what this bug was originally opened requesting.
+
+ [original description]
+
+ requesting backport of PR https://github.com/systemd/systemd/pull/14983 which
fixes the issue described in
https://github.com/systemd/systemd/issues/14982 to 18.04 (bionic)
** Also affects: systemd (Ubuntu Focal)
Importance: Undecided
Status: Fix Released
** Also affects: netplan.io (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: netplan.io (Ubuntu Bionic)
Status: New => Invalid
** Changed in: netplan.io (Ubuntu Eoan)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1867375
Title:
systemd-networkd: UseRoutes behavior change with introduction of
UseGateway param
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