nomad should not assume all linux hosts use eth0 as the default.

[kelseyhightower]

systemd systems do not have eth0. Maybe nomad should detect the default interface based on the default gateway: https://github.com/hashicorp/nomad/blob/master/client/fingerprint/network_unix.go#L38

[apognu]

Or maybe allow for a configuration dierctive to set the interface to use. Not everybody wants to use the default gateway.

[ranjib]

im running ubuntu 15.04 with systemd and it has eth0. both gateway as well as route introspection can be tricky, i 'll prefer to have a direct config option as @apognu suggested.
also , ifconfig is fairly old/deprecated, the code should probably use ip instead.

[dadgar]

#189 addresses this.

[github-actions]

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