Public bug reported:
Using a public wifi hotspot whose DHCP gives IP addresses with a subnet
mask 255.255.255.255, it is not possible for network manager to set the
default route. The message in the log is
Oct 31 16:33:22 einstein NetworkManager: <WARN>
nm_system_device_set_ip4_route(): Failed to set IPv4 default route on
'eth1': No such process
This is because according to route's manpage, the default gateway has to
be reachable before setting the default route which is not possible with
this netmask. For "route" a route add -host <default-gw> ethX before a
route add default gw <default-gw> fixes this problem
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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network-manager not able to set default route if netmask is 255.255.255.255
https://bugs.launchpad.net/bugs/159106
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