I'm assuming you're on linux. One way is to use raw sockets. Another is to go with policy routing.

The (iputils) ping utility has -m option to mark the packets. So it's just a matter of setting up multiple routing tables with ip rule ... and ip route ....

Google for "policy routing fwmark", "multiple default route", etc.

In reply to Re: ping an IPv4 address, using different gateways by Anonymous Monk
in thread ping an IPv4 address, using different gateways by igoryonya

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