Hi, I installed CoreOS 298 (with systemd 212) on a multi-homed machine with a public and a private interface. It’s a data-center machine, and the provider assigns both interfaces through DHCP. Stock CoreOS defaults to DHCP settings for all network interfaces.
When I boot the machine, the public interface (eno1) is missing a default route, and the private interface eno2 instead has two (the first two lines in the routing table below): Apr 25 12:52:15 garry systemd[1]: Started Network Service. Apr 25 12:52:17 garry systemd-networkd[3041]: eno2: carrier on Apr 25 12:52:18 garry systemd-networkd[3041]: eno2: DHCPv4 address 10.60.120.27/26 via 0.0.0.0 Apr 25 12:52:18 garry systemd-networkd[3041]: eno1: carrier on Apr 25 12:52:18 garry systemd-networkd[3041]: eno2: link configured Apr 25 12:52:18 garry systemd-networkd[3041]: eno1: DHCPv4 address 33.112.217.84/24 via 33.112.217.1 Apr 25 12:52:18 garry systemd-networkd[3041]: eno1: link configured # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 0.0.0.0 255.255.255.255 UH 0 0 0 eno2 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 eno2 10.60.120.0 0.0.0.0 255.255.255.192 U 0 0 0 eno2 33.112.217.0 0.0.0.0 255.255.255.0 U 0 0 0 eno1 33.112.217.1 0.0.0.0 255.255.255.255 UH 0 0 0 eno1 Restarting the systemd-networkd.service, correctly assigns the default route for eno1: # systemctl restart systemd-networkd.service Apr 25 12:54:09 garry systemd-networkd[3144]: eno1: DHCPv4 address 33.112.217.84/24 via 33.112.217.1 Apr 25 12:54:09 garry systemd-networkd[3144]: eno1: link configured Apr 25 12:54:09 garry systemd-networkd[3144]: eno2: DHCPv4 address 10.60.120.27/26 via 0.0.0.0 Apr 25 12:54:10 garry systemd-networkd[3144]: eno2: link configured # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 0.0.0.0 255.255.255.255 UH 0 0 0 eno2 0.0.0.0 33.112.217.1 0.0.0.0 UG 0 0 0 eno1 10.60.120.0 0.0.0.0 255.255.255.192 U 0 0 0 eno2 33.112.217.0 0.0.0.0 255.255.255.0 U 0 0 0 eno1 33.112.217.1 0.0.0.0 255.255.255.255 UH 0 0 0 eno1 This happens consistently on every boot. I worked around this by assigning a static address to the public interface, but nevertheless wanted to point this out as a possible bug. Thanks, Damir
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