Can not connect Internet on WSL2 Ubuntu 20.04

    $ ping google.com>     ping: google.com: Temporary failure in name resolution

I am working on Ubuntu 20.04 LTS/WSL2. I using dns proxy server of 192.168.91.4.on Windows.

>ipconfigEthernet adapter Ethernet:   Connection-specific DNS Suffix  . :   Link-local IPv6 Address . . . . . : xxxx::xxxx::xxxx::xxxx   IPv4 Address. . . . . . . . . . . : 192.168.118.144   Subnet Mask . . . . . . . . . . . : 255.255.255.0   Default Gateway . . . . . . . . . : 192.168.118.1Ethernet adapter vEthernet (WSL):   Connection-specific DNS Suffix  . :   Link-local IPv6 Address . . . . . : xxxx::xxxx   IPv4 Address. . . . . . . . . . . : 172.28.224.1   Subnet Mask . . . . . . . . . . . : 255.255.240.0   Default Gateway . . . . . . . . . :

This is my ubuntu network config:

$ cat /etc/resolv.confnameserver 192.168.91.4$ cat /etc/wsl.conf[network]generateResolvConf = false$ ip addr show1: 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 forever2: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN group default qlen 1000    link/ether 6e:ef:08:01:8e:7a brd ff:ff:ff:ff:ff:ff3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 1000    link/ether 62:a9:e4:c3:86:f0 brd ff:ff:ff:ff:ff:ff4: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000    link/ipip 0.0.0.0 brd 0.0.0.05: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000    link/sit 0.0.0.0 brd 0.0.0.06: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000    link/ether 00:15:5d:cf:26:25 brd ff:ff:ff:ff:ff:ff    inet 172.28.235.144/20 brd 172.28.239.255 scope global eth0       valid_lft forever preferred_lft forever    inet6 fe80::215:5dff:fecf:2625/64 scope link       valid_lft forever preferred_lft forever

I guess the problem is

$ ping 192.168.91.4

is not working while on Windows ping to 192.168.91.4 works.192.168.91.4 is DNS proxy server.Thanks in advance.