ping same public host via Ethernet and wireless connection at thesame time

Hello group!

For the purpose of demonstrating difference in multipath latency, I
would like to measure the “ping” time from my laptop to the same host on
Internet, via two different paths: wired Ethernet, and Wifi connection
respectively. The two connections here both support DHCP client and are
connect to Internet with different ISPs (wired university LAN, wireless
commercial connection).

Ideally I wish I can ping a public host (let’s say Google for example)
through the two different connections on the same machine and at the
same time.

I have tried to make the wireless interface gained IP address by DHCP
while statically assign IP address to Ethernet interface. The routing
table after this are as follows:

Kernel IP routing table
Destination Gateway Genmask Flags Iface
192.168.2.0 192.168.2.200 255.255.255.0 UG eth1
192.168.14.0 0.0.0.0 255.255.255.0 U wlan0
0.0.0.0 192.168.14.1 0.0.0.0 UG wlan0

where eth1 is the wired interface and wlan0 is the wifi card.
192.168.2.200 is the gateway on wired Ethernet.


Of course I can reach Google via wlan0. However I have tried to do:
Ping –r –I eth1 www.google.com

And ICMP packets seemed never come back via eth1. I am wondering whether
it is possible to reach public host under my configurations?

Thanks for your time.

All the best,
Xiaochuan