Network problems

Question

linux

There is a single-board computer sbc6845, I'm trying to set up a network on it (via a router), but it turns out that the device cannot access the Internet - ping: sendto: Network is unreachable. but I can connect to the device itself via the network (LAN). question for backfilling - why can this be?
there is a configuration file interfaces.eth0
its contents (already changed many times) at the moment
MACADDRESS=08:00:3e:26:0a:55
GATEWAY=10.0.0.138
NETMASK=255.255.255.0
IPADDRESS=10.0.0.211

there is a configuration file resolv. conf, its contents
are nameserver 194.90.1.5
nameserver 212.143.212.143

thanks in advance for your help.

Answer 1

in fact, despite the fact that there is GATEWAY=10.0.0.138, it is not present in the routing table. therefore, when trying to ping behind the router, we get Network is unreachable.