pppd - terminated by ctrl+c when set as an background process

Question

I run following command terminated with an ampersand to be run as a background process:

pppd call gprs &

But later when i want to terminate a ping command by using ctrl+c the pppd process is also terminated by executing the ip-down script. Why does it behave like that?

Answer 1

To run pppd as an background process:

setsid pppd call gprs