Understanding output of "ip route get"

General Discussions
1

My routing table looks as below:

    [root@master ~]# route -n
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    0.0.0.0         172.31.16.1     0.0.0.0         UG    0      0        0 eth0
    172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
    172.31.16.0     0.0.0.0         255.255.240.0   U     0      0        0 eth0
    192.168.189.64  172.31.23.103   255.255.255.192 UG    0      0        0 tunl0
    192.168.219.64  0.0.0.0         255.255.255.192 U     0      0        0 *
    192.168.235.128 172.31.21.191   255.255.255.192 UG    0      0        0 tunl0
    [root@master ~]#

[root@master ~]# kubectl get node -o wide
NAME      STATUS   ROLES           AGE   VERSION   INTERNAL-IP     EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION                CONTAINER-RUNTIME
master    Ready    control-plane   40h   v1.25.0   172.31.18.250   <none>        CentOS Linux 7 (Core)   3.10.0-1160.76.1.el7.x86_64   containerd://1.6.8
worker1   Ready    <none>          40h   v1.25.0   172.31.21.191   <none>        CentOS Linux 7 (Core)   3.10.0-1160.76.1.el7.x86_64   containerd://1.6.8
worker2   Ready    <none>          40h   v1.25.0   172.31.23.103   <none>        CentOS Linux 7 (Core)   3.10.0-1160.76.1.el7.x86_64   containerd://1.6.8
[root@master ~]#

I need help to understand output of the below command:

    [root@master ~]# ip route get 192.168.235.131
    192.168.235.131 via 172.31.21.191 dev tunl0 src 192.168.219.64
        cache
    [root@master ~]#

Here, I understand that in order to go to the pod with ip 192.168.235.131, the next hop is 172.31.21.191 based upon the routing table.

However, what do we mean by dev tunl0 src 192.168.219.64?

2

Please check the man page.
https://man7.org/linux/man-pages/man8/ip-route.8.html

3

Can you add the output of the command ip a on the node running the Pod?

In kubernetes every node has an interface in the SDN (usually it’s tun0) and whenevery traffic is to be routed to a Pod on that node tun0 is one of the hops