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I have pptpd for PPTP and openswan for L2TP installed on a Ubuntu server, which work without any problem. When a client connects to the server, a new connection is created shown as pppx in the ifconfig output, where x is an incremental number starting from 0. Now my question is, on the server side, is there a way to gracefully disconnect the vpn connection. I tried ifdown ppp0, but it doesn't work. It says:

# ifdown ppp0
ifdown: interface ppp0 not configured

So, is there any command that will disconnect the ppp0 from the server?

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Now I got the answer to this question:

kill -TERM `cat /var/run/ppp0.pid`

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