How to make linux detect default route automatically?

Question

linux

I have a couple of VirtualBox VMs that are connected by a closed network.
One of the Linux machines also has Internet access using a Briged interface.

ifconfig

eth0: flags=4163 mtu 1500
inet 192.168.1.77 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::a00:27ff:feed:9d4d prefixlen 64 scopeid 0x20
ether 08:00:27:ed:9d:4d txqueuelen 1000 (Ethernet)
RX packets 33 bytes 4318 (4.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 23 bytes 2351 (2.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

eth1: flags=4163 mtu 1500
inet 192.168.99.110 netmask 255.255.255.0 broadcast 192.168.99.255
inet6 fe80::a00:27ff:feaf:7965 prefixlen 64 scopeid 0x20
ether 08:00:27:af:79:65 txqueuelen 1000 (Ethernet)
RX packets 14 bytes 2266 (2.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 866 (866.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 85 bytes 28752 (28.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 85 bytes 28752 (28.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

This interface (eth0) is a wifi adapter, and every time I connect to a different wifi network on my laptop, I have to manually type ip ro add default via $IP dev eth0in .

How to get rid of the direct indication of the gateway address? That he defined it on the interface.
If I write simply ip ro add default dev eth0, then the magic will not work, and the Internet will disappear.

Answer 1

Hang dhcp client on this interface