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I have the following interfaces

eth0 192.168.1.178 subnet mask 255.255.255.0 default gateway 192.168.1.1 eth1 10.4.0.6 subnet mask 255.255.255.252 default gateway 10.4.0.5

I want eth1 only can communicate with 10.4.0.5/30 network, rest of the traffic should go through 192.168.1.1 . In this setup I can't ssh to 10.64.0.0/30 network.

How can I configure my routing table for this setup?

These are my current settings:

cat /etc/network/interfaces

interfaces(5) file used by ifup(8) and ifdown(8) Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether XX:XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff inet 192.168.1.178/24 brd 192.168.1.255 scope global dynamic noprefixroute eth0 valid_lft 547025sec preferred_lft 547025sec inet6 fe80::d50:e658:eec:9444/64 scope link noprefixroute valid_lft forever preferred_lft forever 7: eth1: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1436 qdisc pfifo_fast state UP group default qlen 1000 link/ether YY:YY:YY:YY:YY:YY brd ff:ff:ff:ff:ff:ff inet 10.64.0.6/30 brd 10.64.0.7 scope global dynamic noprefixroute eth1 valid_lft 5835sec preferred_lft 5835sec

route -n

Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0 0.0.0.0 10.64.0.5 0.0.0.0 UG 101 0 0 eth1 0.0.0.0 10.64.0.5 0.0.0.0 UG 102 0 0 eth1 10.64.0.4 0.0.0.0 255.255.255.252 U 101 0 0 eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
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  • What did you already try? 0.0.0.0 equals any, so you don't want that on all of your interfaces. Remove the route/gateway and add one for your desired network. Commented Jul 5, 2022 at 6:03
  • What do you mean? You mean I should only keep this line ? 0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0 Commented Jul 6, 2022 at 0:23
  • If you drive your car and see multiple singns pointing to different directions, maybe with different distances, you would choose the shortest. If this road is closed you would drive one of the others. Do they bring you to this target? Then you have your answer. Commented Jul 6, 2022 at 6:12

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