How to Ping explicitly from eth1 instead of eth0

I'm trying to execute a ping with eth1, but the program uses eth0(the default network device). Any tips, tricks, or alternate techniques available?

From the manual:

  -I interface
          interface is either an address, or an interface name.  If interface is an address, it sets source
          address to specified interface address.  If interface in an interface name, it sets source inter‐
          face  to  specified  interface.   For  ping6, when doing ping to a link-local scope address, link
          specification (by the '%'-notation in destination, or by this option) is required.

So, answer is:

ping -I eth1 123.123.123.123

Use the -I option -

-I interface address
          Set  source address to specified interface address. Argument may
          be numeric IP address or name of device. When pinging IPv6 link-
          local address this option is required.

ping -I eth1 www.google.com